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Figure 1: Master Serial SPI configuration diagram example

Figure 2: Master Serial SPI with Vcc configuration diagram example

Figure 3: Slave Spacewire configuration diagram example

Figure 4: ADDR_DEBUG instruction

Figure 5: READ_DEBUG instruction

Figure 6: READ_DEBUG reply

Figure 7: WRITE_DEBUG instruction

Figure 8: WRITE_CONF instruction

Figure 9: Bitstream packing into SPW packet

Figure 10a: Slave Parallel 8 configuration diagram example

Figure 11b: Slave Parallel 16 configuration diagram example

Figure 12: Timing diagram example

Table 1: NG-MEDIUM NX1H35AS configuration modes

Table 2: Configuration related pins

Table 3: Master Serial SPI configuration pin description

Table 4: Master Serial SPI configuration pin description

Table 5: Slave Spacewire configuration pin description

Table 6: NG-Medium SPW instructions

Table 7: Slave Parallel 8 – Slave Parallel 16 configuration pins description

Table 8: Boundary scan instructions

Important information

This document applies exclusively to the configuration of the NG-MEDIUM FPGA referenced NX1H35AS.

For previous silicon versions (NX1H35S), please refer to the following documentation:

NanoXplore_NX1H35S_Configuration_Guide_v1.0

Introduction to NG-MEDIUM Configuration

NX1H35AS is configured by loading the bitstream into internal configuration memory using one of these following modes:

  • JTAG,

  • Slave Parallel 8 bits,

  • Slave Parallel 16 bits,

  • Slave SpaceWire, compliant ECSS-E-ST-50-12C link,

  • Master SPI, compliant with SPI JESD68.01

Bitstream size

This NX1H35AS bitstream size depends on the amount of logic resources used by the application, the number of initialized Flip-flops and the number of user Core RAM and Core Register Files to be initialized.

Maximum user logic configuration (100%)

6.77Mb

Medium configuration(1) (70%)

4.74Mb

Small configuration(1) (50%)

3.38Mb

Maximum Core RAM initialization(2)

5.50Mb

Maximum Core Register File initialization(2)

258.04Kb

CMIC

22.44Kb

Maximum bitstream size

12.55Mb

  1. In a typical design the user can give – or not - an initial value to Flip-Flops at power- up. Reducing the number of initialized Flip-Flops contributes to reduce the bitstream size.

  2. Core RAM and/or Core Register_file can also be initialized – or not - at power-up. Reducing the number of initialized memories contributes to reduce the bitstream size.

Most applications do not require to initialize all memories. A typical bitstream is less than 8Mb.

These numbers are just estimations. The actual size can be determined only by running the mapping software.

Configuration Memory Integrity Check (CMIC)

The CMIC is an embedded engine performing automatic verification and repair of the configuration memory.

A CMIC reference memory is initialized during the bitstream download process with reference data computed by the NanoXmap software.

Once the initialization is done, the CMIC engine can be periodically activated to perform the following sequence:

  1. Read configuration data

  2. Calculate signature

  3. Compare the signature with CMIC reference

  4. If a mismatch is detected:

    1. Calculate faulty address (BAD @) and faulty bit location

    2. Read DATA[BAD @]

    3. Repair flipped bit

    4. Write DATA[BAD @]

For further information, please refer to the NX1H35AS CMIC Application note.

Device configuration details

Purpose of NX1H35AS configuration

NX1H35AS chips are SRAM-based FPGAs. To achieve user-defined functionality their configuration bitstream must be downloaded first.

NX1H35AS chips configuration modes summary

NX1H35AS chips are always accessible through JTAG, and also support several configuration modes. At power-up, MODE[3:0] pins state define the configuration mode. RST_N is a dedicated input pin that allows to reset the configuration engine, and launches the configuration process after RST_N is released. (It can’t be used to reset the FPGA user’s logic).

MODE[3:0]

Configuration mode

0000 0x0

RESERVED

0001 0x1

RESERVED

0010 0x2

Master Serial SPI

0011 0x3

Master Serial SPI with Vcc control

0100 0x4

Slave SpaceWire

0101 0x5

RESERVED

0110 0x6

Slave Parallel 8

0111 0x7

Slave Parallel 16

Table 1: NG-MEDIUM NX1H35AS configuration modes

Configuration modes usage

JTAG configuration channel is always active regardless the selected configuration mode. JTAG accesses while the configuration interface is active are not recommended (risk of conflict with the bitstream manager operation)

In slave modes (SpaceWire, Slave Parallel 8 or Slave Parallel 16), NX1H35AS chip must be fed its bitstream through the selected interface.

In Master Serial SPI modes, NX1H35AS chip automatically fetches its bitstream from the external memory (SPI or SPI with Vcc control) after RST_N is released.

Prog bank pins state during and after configuration

According the selected configuration mode, each of the prog is “multi-usage”. Some of the active pins must be required for correct configuration, and some other pins must be left unconnected. In addition, some prog bank pins can be configured as additional user’s I/O, providing that the supported I/O standard is:

  • LVDS with internal impedance adaptation for the dedicated Spacewire pins.

  • LVCMOS_3.3V for the other prog pins (with 60 mA output drive for the outputs, and 10K to 40K default PullUp)

The prog bank pins that are not used or activated by the selected configuration mode are configured as inputs with internal default PullUp (10K to 40K) during the configuration. After the configuration they stay configured as inputs with internal default PullUp if not used, or take the user’s defined functionality.

User’s I/O pins state during and after configuration

Before reset, I/Os state are undertmined.

During the configuration process, all user’s I/Os are configured as inputs with an internal 10K to 40K default Pullup.

After configuration the user I/O pins behaves as defined by the bitstream. Internal default PullUp is set on single ended inputs. Internal PullDown is not available. For external PullDown resistors, NanoXplore recommends 1K to 2.2K values.

NX1H35AS chips prog interface pin list

The NX1H35AS presents 40 signal pins.

The user must provide the 4-bit MODE value to select the configuration mode. In addition, the internal configuration engine requires an external reset signal (RST_N). RST_N must be asserted (low) during at least 3 microseconds. When RST_N is de-asserted, the configuration process starts after up to 3 us delay, according the MODE bits settings.

Depending on the selected configuration MODE, some prog bank pins are activated during the process. Some other remain as inputs with internal PullUp during the configuration process.

In addition, some prog bank pins can be used as auxiliary user’s defined I/Os after completing the configuration.

The next table summarizes the list of pins that can be affected during the configuration process.

Grp

Name

I/O

Description

GLOBAL

MODE(3 :0)

I

Input pins sampled at power-up. MODE(3:0). They define the configuration

mode to be used for NG-MEDIUM configuration. MODE(3:0) cannot be changed when RST_N = ‘1’

CLK

I

Required only for slave parallel 8/16 configuration (20 or 50 MHz). For other

configuration modes, must be tied to 3.3V via 10KOhms pullup resistor

RST_N

I

Mandatory input. When low, it resets the internal configuration engine. RST_N must be low at least during 3 microseconds to ensure a proper configuration engine reset. When RST_N goes high, the configuration starts after up to 3

additional microseconds.

READY

O

Goes high when the configuration is complete (the FPGA enters in user’s mode)

ERROR

O

Generates a high level pulse (~20 ns or one CLK cycle) each time an error is

encountered during the configuration.

Slave Parallel 8

CS_N

I

Active low Chip_Select input. Used in Slave Parallel 8 mode. The master can

write or read to/from the configuration engine when CS_N is low during a CLK rising edge.

WE_N

I

Active low Write_Enable input. Used in Slave Parallel 8 mode. The master can

write to the configuration engine when both CS_N and WE_N are low during a CLK rising edge.

DATA_OE

O

This pin is reserved. Must be left unconnected

D(7 :0)

I/O

8-bit data bus used in Slave Parallel 8 mode to write the bitstream and/or read

internal NG-MEDIUM internal state values

Slave Parallel 16

CS_N

I

Active low Chip_Select input. Used in Slave Parallel 16 mode. The master can write or read to/from the configuration engine when CS_N is low during a CLK rising edge.

WE_N

I

Active low Write_Enable input. Used in Slave Parallel 16 mode. The master can

write to the configuration engine when both CS_N and WE_N are low during a CLK rising edge.

DATA_OE

O

This pin is reserved. Must be left unconnected

D(15 :0)

I/O

16-bit data bus used in Slave Parallel 16 mode to write the bitstream and/or

read internal NG-MEDIUM internal state values

Master Serial SPI

D(8)

O

Used in Master Serial SPI and Master Serial SPI with Vcc control, as CS_N output to the external SPI Flash memory.

D(9)

O

Used in Master Serial SPI and Master Serial SPI with Vcc control, as clock

output to the external SPI Flash memory.

D(10)

I

Used in Master Serial SPI and Master Serial SPI with Vcc control, as data

input (MISO) from the external SPI Flash memory.

D(11)

O

Used in Master Serial SPI and Master Serial SPI with Vcc control, as data output (MOSI) to the external SPI Flash memory (while writing a new bitstream

into the SPI Flash.

D(12)

I

Configured as input (with internal PullUp) during the configuration. Can be

configured as,user’s I/O available after completing the configuration.

D(13)

I/O

Configured as input (with internal PullPup) during the configuration in Master Serial SPI

Configured as high level output during the configuration in Master Serial SPI with Vcc control.

Can be configured as,user’s I/O available after completing the configuration.

D(14)

I/O

D(15)

I/O

SpaceWire

DIN_P

I

SpaceWire interface is available after completing the configuration in Master Serial SPI, Master Serial SPI with Vcc control or Slave Parallel 8 o 16-bit rmodes.

If SpaceWire is used for the configuration, it can’t be used for other purpose than the configuration.

DIN_N

I

SIN_P

I

SIN_N

I

DOUT_P

O

DOUT_N

O

SOUT_P

O

SOUT_N

O

JTAG

TCK

I

JTAG clock

TMS

I

JTAG TMS

TDI

I

JTAG TDI

TRST_N

I

JTAG TRST_N

TDO

O

JTAG TDO

Table 2: Configuration related pins

Detailed configuration modes

SPI Modes

On board SPI flash memory programming:

For Master Serial modes, the on-board flash memory programming operation requires changing the MODE[3:0] into Slave mode to ensure the accessibility to the flash. The NX1H35AS chip may then be configured through JTAG with a dedicated design, to program the memory with the user data, also transmitted by JTAG.

Temporary change of the configuration mode, might be:

  • Master Serial SPI mode 0010 moved to 0001

  • Master Serial SPI-Vcc mode 0011 moved to 0001

(“0110” Slave Parallel 8 and “0100” Slave SpaceWire are also valid for “on board SPI Flash programming”).

Please refer to the NXbase2_User_Manual – Board related commands for detailed information.

Master Serial SPI configuration details:

The next figure shows a suggestion of schematic to implement the Master Serial SPI configuration, then the pin list table describes the behavior of the prog bank pins when this mode is selected.

Master Serial SPI Mode

Master Serial SPI Mode

Prog bank (INTERFACE) pins used and/or impacted by configuration

Group

Pin name

I, O

or I/O

User I/O

During configuration

Req

uired

Impa

cted

Pin behavior

GLOBAL

Mode(3 :0)

I

No

0010

-

Configuration Mode

RST_N

I

No

Yes

-

Active Low Reset of the internal configuration engine.

Mandatory input. When low, it resets the internal configuration engine. RST_N must be low at least during 3 us to ensure a proper configuration engine reset. When RST_N goes high, the configuration

starts after up to 3 us RST_N is released.

READY

O

No

No

Yes

Goes High when the configuration is complete

ERROR

O

No

No

Yes

Generates a High level pulse if an error has been detected during the configuration

(~20 ns pulse)

CLK

I

No

No

-

Not required (tie to 3.3V via pull-up resistor)

Slave

CS_N

I

No

No

Yes

Unused but unavailable. Must be left unconnected

WE_N

I

No

No

Yes

Unused but unavailable. Must be left unconnected

DATA_OE

O

No

No

Yes

Unused but unavailable. Must be left unconnected

D(7:0)

I

No

No

Yes

Unused but unavailable. Must be left unconnected

Slave par ext

D(8)

O

No

Yes

-

External memory Chip Select (active Low) Requires a diode + PullUp (see diagram)

When the bitstream download is completed this pin is drived to ‘1’

D(9)

O

No

Yes

-

External bitstream memory Clock

When the bitstream download is completed this pin is drived to ‘0’

D(10)

I

No

Yes

-

MISO (data in from external memory)

D(11)

O

No

Yes

-

MOSI (data out to external memory)

When the bitstream download is completed this pin is drived to ‘0’

D(12)

I

Yes

No

No

Available as User’s I/O

D(13)

I/O

Yes

No

No

Available as User’s I/O

D(14)

I/O

Yes

No

No

Available as User’s I/O

D(15)

I/O

Yes

No

No

Available as User’s I/O

SPACEWIRE

DIN_P

I

Yes(*)

No

No

When Master Serial SPI is selected the SpaceWire internal IP can be used after completing the configuration

(*) The SpaceWire internal IP is available for the user’s application.

DIN_N

I

Yes(*)

No

No

SIN_P

I

Yes(*)

No

No

SIN_N

I

Yes(*)

No

No

DOUT_P

O

Yes(*)

No

No

DOUT_N

O

Yes(*)

No

No

SOUT_P

O

Yes(*)

No

No

SOUT_N

O

Yes(*)

No

No

JTAG

TCK

I

No

No

No

JTAG is available in all modes.

Don’t use it while configuration is in progress.

TMS

I

No

No

No

TDI

I

No

No

No

TRST_N

I

No

No

No

TDO

O

No

No

No

Table 3: Master Serial SPI configuration pin description

Master Serial SPI with Vcc control configuration details:

The next figure shows a suggestion of schematic to implement the Master Serial SPI with VCC control configuration, then the pin list table describes the behavior of the prog bank pins when this mode is selected.

This configuration mode is the same as Master Slave SPI, with the only difference that the SPI Flash memory is powered by using 3 pins of the NG-MEDIUM prog bank to supply the external SPI. This can contribute to reduce the risk of corruption of bitstream/data stored into the external SPI memory device.

Master Serial SPI Mode with VCC control

Master Serial SPI Mode with VCC control

Prog bank (INTERFACE) pins used and/or impacted by configuration

Grou

Pin name

I, O

or I/O

User I/O

During configuration

Req

uired

Impa

cted

Pin behavior

GLOBAL

Mode(3 :0)

I

No

0011

-

Configuration Mode

RST_N

I

No

Yes

-

Active Low Reset of the internal configuration engine.

Mandatory input. When low, it resets the internal configuration engine. RST_N must be low at least during 3 us to ensure a proper configuration engine reset. When RST_N

goes high, the configuration starts up to 3 us after RST_N is released.

READY

O

No

No

Yes

Goes High when the configuration is complete

ERROR

O

No

No

Yes

Generates a High level pulse if an error has been detected

during the configuration (~20 ns pulse)

CLK

I

No

No

-

Not required (tie to 3.3V via pull-up resistor)

Slave

CS_N

I

No

No

Yes

Unused but unavailable. Must be left unconnected

WE_N

I

No

No

Yes

Unused but unavailable. Must be left unconnected

DATA_OE

O

No

No

Yes

Unused but unavailable. Must be left unconnected

D(7:0)

I

No

No

Yes

Unused but unavailable. Must be left unconnected

Slave Par ext

D(8)

O

No

Yes

-

External memory Chip Select (active Low)

When the bitstream download is completed this pin is drived to ‘1’

D(9)

O

No

Yes

-

External bitstream memory Clock

When the bitstream download is completed this pin is drived to ‘0’

D(10)

I

No

Yes

-

MISO (data in from external memory)

D(11)

O

No

Yes

--

MOSI (data out to external memory)

When the bitstream download is completed this pin is drived to ‘0’

D(12)

I

Yes

No

No

Available as User’s I/O

D(13)

I/O

Yes

Yes

-

To Vcc SPI Flash memory

When the bitstream download is completed this pin is drived to ‘0’

D(14)

I/O

Yes

Yes

-

To Vcc SPI Flash memory

When the bitstream download is completed this pin is drived to ‘0’

D(15)

I/O

Yes

Yes

-

To Vcc SPI Flash memory

When the bitstream download is completed this pin is drived to ‘0’

SPACEWIRE

DIN_P

I

Yes(*)

No

No

When Master Serial SPI with Vcc Control is selected the SpaceWire internal IP can be used after completing the configuration

(*) The SpaceWire internal IP is available for the user’s application.

DIN_N

I

Yes(*)

No

No

SIN_P

I

Yes(*)

No

No

SIN_N

I

Yes(*)

No

No

DOUT_P

O

Yes(*)

No

No

DOUT_N

O

Yes(*)

No

No

SOUT_P

O

Yes(*)

No

No

SOUT_N

O

Yes(*)

No

No

JTAG

TCK

I

No

No

No

JTAG is available in all modes. Don’t use it while configuration is in progress.

TMS

I

No

No

No

TDI

I

No

No

No

TRST_N

I

No

No

No

TDO

O

No

No

No

Table 4: Master Serial SPI configuration pin description

Slave SpaceWire configuration details:

The next figure shows a suggestion of schematic to implement the Slave SpaceWire configuration, then the pin list table describes the behavior of the prog bank pins when this mode is selected.

Slave SpaceWire

Slave SpaceWire

Prog bank (INTERFACE) pins used and/or impacted by configuration

Grou

Pin name

I, O

or I/O

User I/O

During configuration

Req

uired

Impa

cted

Pin behavior

GLOBAL

Mode(3:0)

I

No

1100

-

Configuration Mode

RST_N

I

No

Yes

-

Active Low Reset of the internal configuration engine.

Mandatory input. When low, it resets the internal configuration engine. RST_N must be low at least during 3 us to ensure a proper configuration engine reset. When RST_N goes high, the configuration starts up to 3 us after

RST_N is released.

READY

O

No

No

Yes

Goes High when the configuration is complete

ERROR

O

No

No

Yes

Generates a High level pulse if an error has been detected during the configuration

(~20 ns pulse)

CLK

I

No

No

-

Not required (tie to 3.3V via pull-up resistor)

Slave Parallel

CS_N

I

No

No

Yes

Unused but unavailable. Must be left unconnected

WE_N

I

No

No

Yes

Unused but unavailable. Must be left

unconnected

DATA_OE

O

No

No

Yes

Unused but unavailable. Must be left

unconnected

D(7:0)

I

No

No

Yes

Unused but unavailable. Must be left

unconnected

Slave Par ext

D(8)

O

No

No

-

Available as User’s I/O

D(9)

O

No

No

-

Available as User’s I/O

D(10)

I

No

No

-

Available as User’s I/O

D(11)

O

No

No

-

Available as User’s I/O

D(12)

I

Yes

No

No

Available as User’s I/O

D(13)

I/O

Yes

No

-

Available as User’s I/O

D(14)

I/O

Yes

No

-

Available as User’s I/O

D(15)

I/O

Yes

No

-

Available as User’s I/O

SPACEWIRE

DIN_P

I

No

Yes

-

When Slave SpaceWire configuration mode is selected, the SpaceWire IP remains dedicated to configuration monitoring functions.

DIN_N

I

No

Yes

-

SIN_P

I

No

Yes

-

SIN_N

I

No

Yes

-

DOUT_P

O

No

Yes

-

DOUT_N

O

No

Yes

-

SOUT_P

O

No

Yes

-

SOUT_N

O

No

Yes

-

JTAG

TCK

I

No

No

No

JTAG is available in all modes. Don’t use it while configuration is in progress.

TMS

I

No

No

No

TDI

I

No

No

No

TRST_N

I

No

No

No

TDO

O

No

No

No

Table 5: Slave Spacewire configuration pin description

Spacewire configuration instructions

The supported SPW instructions by the NG-Medium FPGA are as stated in Table 6: NG-Medium SPW instructions6 below.

Command Code

Command

0x01

ADDR_DEBUG

0x02

READ_DEBUG

0x04

WRITE_DEBUG

0x08

WRITE_CONF

Table 6: NG-Medium SPW instructions

ADDR_DEBUG instruction

The ADDR_DEBUG instruction is used to set the address of the loader register which will be accessed in all subsequent instructions. Following figure illustrates the format of the packet. Note that if many reads and writes will be performed to the same register only one ADDR_DEBUG instruction is needed.

READ_DEBUG instruction

The READ_DEBUG instruction is used to read the loader register value from the address defined by the previous ADDR_DEBUG instruction. READ_DEBUG instruction is a 1-byte packet containing only the instruction code (0x02) as shown in 5 below. The FPGA responds with a 4-bytes packet containing the read value which is sent LSB first as shown in 6.

WRITE_DEBUG instruction

The WRITE_DEBUG instruction is used to write a value to the address of the loader register defined by the previous ADDR_DEBUG instruction. WRITE_DEBUG instruction contains the instructions code (0x04) followed by 4-bytes data to be written. Data is sent LSB first as shown in Error! Reference source not found.7.

WRITE_CONF instruction

The WRITE_CONF instruction is used to program the NG-MEDIUM FPGA. The SPW packet size depends on bitstream size and it has the following fields:

  • Instruction code: 0x08 for WRITE_CONF

  • FPGA bitstream: the bitstream to be programmed into the FPGA.

This field is obtained by converting each 32bits bitstream word to 4 bytes sent LSB first as illustrated in Figure 9 below.

Slave parallel 8 configuration details:

The next figure shows a suggestion of schematic to implement the Slave Parallel 8 configuration, then the pin list table describes the behavior of the prog bank pins when this mode is selected.

Slave Parallel 8

Slave Parallel 16

Slave Parallel 8 – Slave Parallel 16

Prog bank (INTERFACE) pins used and/or impacted by configuration

Grou

Pin name

I, O

or I/O

User I/O

During configuration

Req

uired

Impa

cted

Pin behavior

GLOBAL

Mode(3:0)

I

No

1110

-

Configuration Mode

RST_N

I

No

Yes

-

Active Low Reset of the internal configuration engine.

Mandatory input. When low, it resets the internal configuration engine. RST_N must be low at least during 50 CLK cycles to ensure a proper configuration engine reset. When RST_N goes high, the configuration starts after up to 50 CLK cycles.

READY

O

No

No

Yes

Goes High when the configuration is complete

ERROR

O

No

No

Yes

Generates a High level pulse if an error has been detected during the configuration

(pulse width = one CLK cycle)

CLK

I

No

Yes

-

20 to 50 MHz input clock for the configuration engine (must

be strictly greater than twice the frequency of TCK is JTAG is used)

Slave Parallel

CS_N

I

No

Yes

-

Active low Chip Select input

WE_N

I

No

Yes

-

Active low

Write Enable input

DATA_OE

O

No

Yes

-

This pin is reserved.

Must be left unconnected

D(7 :0)

I/O

No

Yes

-

8-bit data bus (input during the configuration)

Slave Par ext

D(8)

I/O

Yes

No

No

Slave Parallel 8 : Available as User’s I/O

Slave Parallel 16 :

D(9)

I/O

Yes

No

No

D(10)

I/O

Yes

No

No

D(11)

I/O

Yes

No

No

D(12)

I/O

Yes

No

No

D(13)

I/O

Yes

No

No

D(14)

I/O

Yes

No

No

D(15)

I/O

Yes

No

No

SPACEWIRE

DIN_P

I

Yes(*)

No

No

When Slave Parallel 8 is selected the SpaceWire internal IP can be used after completing the configuration

(*) The SpaceWire internal IP is available for the user’s application.

DIN_N

I

Yes(*)

No

No

SIN_P

I

Yes(*)

No

No

SIN_N

I

Yes(*)

No

No

DOUT_P

O

Yes(*)

No

No

DOUT_N

O

Yes(*)

No

No

SOUT_P

O

Yes(*)

No

No

SOUT_N

O

Yes(*)

No

No

JTAG

TCK

I

No

No

No

JTAG is available in all modes. Don’t use it during configuration

TMS

I

No

No

No

TDI

I

No

No

No

TRST_N

I

No

No

No

TDO

O

No

No

No

Table 7: Slave Parallel 8 – Slave Parallel 16 configuration pins description

Slave Parallel interface usage

In Slave Parallel 8 and Slave Parallel 16 modes, the configuration clock must be provided to the FPGA on the dedicated CLK input pin. Its frequency can range from 20 MHz to 50 MHz, in any case it must be strictly greater than twice the JTAG (TCK) frequency – if used.

In order to avoid setup/hold time problems, the master can use the falling CLK edge to generate CS_N, WE_N and D(7:0) or D(15:0).

The master can start downloading the bitstream bytes after 50 configuration clock (CLK) cycles.

Each byte (or word) is written on the rising edge of CLK, while CS_N and WE_N are activated (low level) simultaneously. Dummy cycles can be inserted – if required by the master by de-asserting both CS_N and WE_N during one or more cycles between any two consecutive bytes. The next figure illustrates an example of timing diagram.

Boundary scan

IEEE 1149 JTAG implementation

NX1H35AS devices support IEEE Std 1149.1 JTAG boundary scan operation for board and device testing.

The EXTEST, INTEST, SAMPLE, BYPASS, IDCODE, USERCODE, and HIGHZ

instructions are all included. The tap also supports internal user-defined registers (USER1, USER2) and instructions for device configuration and test.

JTAG interface pins include the standard TCK, TMS, TDI and TDO pads, as well as the optional TRST pad.

NX1H35AS chips JTAG instructions

NX1H35AS chips boundary scan instructions are the following:

Hex

Instruction

Function

0x0

EXTEST

Boundary scan external test

0x1

SAMPLE

Boundary scan sample

0x1

PRELOAD

Boundary scan preload

0x2

WR_CONF

Nanoxplore bitstream download

0x3

WR_DEBUG

Write debug instruction

0x4

RD_DEBUG

Read debug instruction

0x5

ADDR_DEBUG

Address debug instruction

0x6

INTEST

Boundary scan in internal test

0x7

IDCODE

Boundary scan design identification

0x8

USRCODE

User design identification register

0x9

USER1

User registers access

0xA

USER2

User registers access

0xC

HIGHZ

Tri-state all device I/Os

0xF

BYPASS

Single-clock bypass TDI to TDO

Table 8: Boundary scan instructions

NX1H35AS devices provide a 1046-bit scan chain, described in each device BSDL file.

The WRITE_CONF instruction is used to program the NG-MEDIUM FPGA.

The ADDR_DEBUG instruction is used to set the address of the loader register which will be accessed in all subsequent instructions.

The READ_DEBUG instruction is used to read the loader register value from the address defined by the previous ADDR_DEBUG instruction.

The WRITE_DEBUG instruction is used to write a value to the address of the loader register defined by the previous ADDR_DEBUG instruction.

The IDCODE instruction returns the NG-MEDIUM Identification’s code: 0x675.

The USRCODE instruction returns the user-defined code (0xFFFFFFFF by default). The USER1 instruction is used to access to the user1 registers from the FPGA fabric. The USER2 instruction is used to access to the user2 registers from the FPGA fabric. The HIGHZ instruction is used to deactivate the outputs of all pins.

The BYPASS instruction is used to bypass the device.

NX1H35AS boundary scan usage

NX1H35AS chips are fully programmable devices, so boundary scan instructions usage requires some minimal device configuration using a limited bitstream, especially for the EXTEST instruction:

  • pads to be used as outputs need a minimum output drive configuration.

  • pads to be used as inputs need a minimum input thresholds configuration.

NX1H35AS boundary scan errata

NX1H35AS chips boundary-scan architecture presents some implementation bugs, listed below:

Chip initialization with unused JTAG interface

Problem:

When JTAG interface is not used, the NX1H35AS chip initialization may fail on a boundary scan initialization error. The interface initialization requires at least one rising edge on the TCK JTAG clock.

Workaround:

  • unused JTAG input pads TCK, TMS and TDI should be provided a 10-100KΩ pull- up resistor to VDDIO_SERVICE.

  • unused TRST input should be provided a 1KΩ pull-down resistor

  • TCK should be driven by a diode (anode) connected to RST_N (cathod) prog interface reset pin, so that the end-of-reset rising edge provides the required TCK.

Dedicated clock inputs in boundary scan INTEST

Problem:

In boundary scan INTEST instruction execution, the dedicated clock inputs on the SIMPLE banks (0, 1, 6 and 8) are seen by the internal design as simple inputs but not as clock inputs.

Dedicated clock inputs on the COMPLEX banks (2, 5, 9 and 12) are fully functional in boundary scan INTEST.

NG_MEDIUM register

To access a register, the user needs to use the ADDR_DEBUG instruction first, and then the WR_DEBUG or RD_DEBUG instructions.

Address

Register Name

R/W

Description

0x00

NG-MEDIUM STATUS

R

Status register

0x0b

NG-MEDIUM JTAG_IDCODE

R

JTAG identification code

0x0c

NG-MEDIUM JTAG_USERCODE

RW

JTAG user code

0x0d

NG-MEDIUM SPI_CTRL

RW

SPI configuration

0x0e

NG-MEDIUM ERROR1

R

Error Flags

0x0f

NG-MEDIUM ERROR1_MASK

RW

Error Mask

0x10

NG-MEDIUM ERROR2

R

Error Flags

0x11

NG-MEDIUM ERROR2_MASK

RW

Error Mask

0x14

NG-MEDIUM MAX_ERROR_CNT

RW

Error counter

0x15

NG-MEDIUM DEVICE_ID

RW

FPGA Device ID

0x1a

NG-MEDIUM THSENS_CTRL

RW

Thermal Sensor Configuration

0x1b

NG-MEDIUM THSENS_DATA

R

Thermal Sensor Data

0x1c

NG-MEDIUM DUMP_CTRL

RW

DUMP configuration

0x1d

NG-MEDIUM SPW_CTRL1

RW

SPACEWIRE configuration

0x1e

NG-MEDIUM SPW_CTRL2

RW

SPACEWIRE configuration

0x1f

NG-MEDIUM LOADER_CTRL

RW

Loader Controller

STATUS

Name

Address

Access

Reset Value

Description

STATUS

0x00

Read-only

0x0000

Status register

Bits

Field name

rst

Description

[15]

had_error_unmas ked

0x0

1 when ERRORx contents flags errors (without application of mask vector)

[14]

had_error

0x0

1 when ERRORx contents flags errors (with application of mask vector)

[13]

status_cmic_run

0x0

1 when CMIC is running

[5]

status_max_error

0x0

1 when the Max Error is reach

[4]

status_error

0x0

1 when the Error Flag is rise

[3]

status_download

0x0

1 when the loader download a bitstream

[2]

status_prog

0x0

1 when the Programmation Flag is rise

[1]

status_cold_start

0x0

1 when the Ready Flag is first run

[0]

status_ready

0x0

1 when the Ready Flag is rise

JTAG_IDCODE

Name

Address

Access

Reset Value

Description

JTAG_IDCODE

0x0b

Read-only

0x00000675

JTAG identification code

Bits

Field name

rst

Description

[31:28]

jtag_idcode_version

0x0

Version number

[27:12]

jtag_idcode_part

0x0

Part number

[11:1]

jtag_idcode_manufactur er

0x33

a

Manufacturer ID: 11:8 (4bits) bank, 7:1 (7bits) manufacturer id

[0]

jtag_idcode_one

0x1

Constant Always 1

JTAG_USERCODE

Name

Address

Access

Reset Value

Description

JTAG_USERCODE

0x0c

Read-write

0xffffffff

JTAG user code

Bits

Field name

rst

Description

[31:0]

jtag_usercode

0xffffffff

JTAG user code

SPI_CTRL

Name

Address

Access

Reset Value

Description

SPI_CTRL

0x0d

Read- write

0x1f4003f

SPI configuration

Bits

Field name

rst

Description

[30:15]

spi_powerup_cycle

0x3e8

PowerUp duration (need 300us).

Number of clock cycles needed for 300us

[14:12]

spi_dummy_cycle

0x0

Number of Dummy cycle

[11:4]

spi_read_code

0x3

SPI Read Code

[3:0]

spi_clk_ratio

0xf

SPI Clock frequency is divided by spi_clk_ratio+2

ERROR1

Name

Address

Access

Reset Value

Description

ERROR1

0x0e

Read-only

0x00000000

Error Flags

Bits

Field name

Description

[31]

flag_error_spi_sel

SPI selection error flag

[30]

flag_error_parallel_read_access_ovf

Parallel read access overflow

[29]

flag_error_parallel_write_access_conflic t

Parallel write access conflict

[28]

flag_error_fifo_serializer_full

FIFO of serializer full

[27]

flag_error_reg_read_unaccepted

Register read access is rejected

[26]

flag_error_reg_write_unaccepted

Register write access is rejected

[25]

flag_error_bl_read_unaccepted

Bootloader read is rejected

[24]

flag_error_cfgctx_read_unaccepted

CFGCTX read is rejected

[23]

flag_error_cfgctx_write_unaccepted

CFGCTX write is rejected

Bits

Field name

Description

[22]

flag_error_clear_unaccepted

Clear command rejected

[21]

flag_error_bltest_unaccepted

Bootloader test command is rejected

[20]

flag_error_reg_read_busy

Register read busy error

[19]

flag_error_reg_write_busy

Register write busy error

[18]

flag_error_bl_read_busy

Bootloader read busy error

[17]

flag_error_cfgctx_read_busy

CFGCTX read busy error

[16]

flag_error_cfgctx_write_busy

CFGCTX write busy error

[15]

flag_error_clear_busy

Clear busy error

[14]

flag_error_bltest_busy

Bootloader test busy error

[13]

flag_error_invalid_address

Address is invalid

[12]

flag_error_direct_engine_rsp_busy

Direct engine response is busy

[11]

flag_error_direct_engine_rsp_conflict

Direct engine response in conflict

[10]

flag_error_direct_engine_req_invalid_lo ader

Direct engine request signals invalid loader

[9]

flag_error_access_write_conflict

Write access conflict detected

[8]

flag_error_frame_engine_edac_uncorre cted

Uncorrected error on frame engine's EDAC

[7]

flag_error_frame_engine_crc_frame

CRC error detected on frame

[6]

flag_error_frame_engine_crc_bitstream

CRC error detected on bitstream

[5]

flag_error_frame_engine_watchdog_tim eout

Watchdog's timeout is reached

[4]

flag_error_frame_engine_unexpected_f rame

Frame received but not expected

[3]

flag_error_frame_engine_req_invalid_lo ader

Invalid loader error detected on frame request

[2]

flag_error_frame_access_conflict

Access conflict detected on frame

[1]

flag_error_direct_access_rsp_conflict

Direct access response conflict detected

[0]

flag_error_direct_access_req_conflict

Direct access request conflict detected

ERROR1_MASK

Name

Address

Access

Reset Value

Description

ERROR1_MASK

0x0f

Read-write

0x00000000

Error Mask

Bits

Field name

rst

Description

[31:0]

flag_error1_mask

0x0

Mask register for ERROR1

ERROR2

Name

Address

Access

Reset Value

Description

ERROR2

0x10

Read-only

0x00

Error Flags

Bits

Field name

Description

[9]

flag_error_spw_link_broken

SPW link disconnection error detected

[8]

flag_error_spw_err_int

SPW internal error detected

[7]

flag_error_spw_nom_int

SPW NOM error

[6]

flag_error_cmic_max_run

CMIC max run error

[5]

flag_error_cmic_check_uncorrected

CMIC error is uncorrected

[4]

flag_error_cmic_ref_edac_uncorrected

CMIC reference for EDAC is uncorrected

[3]

flag_error_cmic_ref_addr_ovf

CMIC reference address overflow detected

[2]

flag_error_cmic_access_conflict

Conflict detected on CMIC access

[1]

flag_error_spw_unexpected_packet

Unexpected SPW packet detected

[0]

flag_error_spw_eep

SPW EEP marker detected

ERROR2_MASK

Name

Address

Access

Reset Value

Description

ERROR2_MASK

0x11

Read-write

0x00

Error Mask

Bits

Field name

rst

Description

[9:0]

flag_error2_mask

0x0

Mask register for ERROR2

MAX_ERROR_CNT

Name

Address

Access

Reset Value

Description

MAX_ERROR_CNT

0x14

Read-write

0x0000000f

Error counter

Bits

Field name

rst

Description

[3:0]

MAX_ERROR_CNT

0xf

Maximum error count permitted before lighting error led

DEVICE_ID

Name

Address

Access

Reset Value

Description

DEVICE_ID

0x15

Read-write

0x0

FPGA Device ID

Bits

Field name

rst

Description

[3:0]

device_id

0x0

FPGA device id

THSENS_CTRL

Name

Address

Access

Reset Value

Description

THSENS_CTRL

0x1a

Read-write

0x0000

JTAG

identification code

Bits

Field name

rst

Description

[15:6]

thsens_clk_ratio

0x0

Clock ratio between bitstream manager and thermal sensor

Clock frequency is divided by thsens_clk_ratio+2

[5:1]

thsens_dcorrect

0x0

Digital code to correct

[0]

thsens_power_up

0x0

Thermal Sensor is powered

THSENS_DATA

Name

Address

Access

Reset Value

Description

THSENS_DATA

0x1b

Read-only

0x00

Thermal Sensor Data

Bits

Field name

rst

Description

[8:2]

thsens_data

0x0

Thermal Sensor Ouput

[1]

thsens_overflow

0x0

Overflow of digital

[0]

thsens_enable

0x0

Thermal Sensor is online

DUMP_CTRL

Name

Address

Access

Reset Value

Description

DUMP_CTRL

0x1c

Read-write

0xf

DUMP

configuration

Bits

Field name

rst

Description

[3:0]

dump_clk_ratio

0xf

DUMP Clock frequency is divided by dump_clk_ratio+2

SPW_CTRL1

Name

Address

Access

Reset Value

Description

SPW_CTRL1

0x1d

Read-write

0x0000

SPACEWIRE

configuration

Bits

Field name

rst

Description

[15:8]

spw_freq_run

0x0

frequency used in run state

Clock frequency divided by (spw_freq_run+1)

[7:0]

spw_freq_init

0x0

frequency used in init state

Clock frequency divided by (spw_freq_init+1)

SPW_CTRL2


Name

Address

Access

Reset Value

Description

SPW_CTRL2

0x1e

Read-write

0x1402b

SPACEWIRE

configuration

Bits

Field name

rst

Description

[17:8]

spw_delay_prg

0x140

delay of 6.4 us

Number of clock cycles needed for 6.4 us

[7:0]

spw_DisCntLim

0x2b

Disconnect time limit (850ns)

Number of clock cycles needed for 850ns

LOADER_CTRL

Name

Address

Access

Reset Value

Description

LOADER_CTRL

0x01

Read-write

0x1f

Loader Controller

Bits

Field name

rst

Description

[3]

config_force

0x1

Force configuration (force bitstream load)

[2]

ready_force

0x1

Force ready flag

[1]

ready

0x1

Set ready flag when postamble frame occurs

[0]

cmic_enable

0x1

CMIC Feature Enable

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