...
Board check: No board purpose for this testcase.
SpacewireTiming
Description:
The user must be able to get all needed timing in case of recovery clock like Spacewire one.
Spacewire recovery clock is generated by a XOR between DIN and SIN, data and strobe input signals.
The architecture looks like the following:
...
Spacewire clock creation must be done as follows as the tool will separate it in 2 clock signals with one inverted.
| Code Block | ||
|---|---|---|
| ||
p.createClock(target=getRegisterClock('din_r_reg'), name='input_xor_rising', period=10.0, rising=0.0, falling=5.0)
p.createClock(target=getRegisterClock('din_f_reg'), name='input_xor_falling', period=10.0, rising=0.0, falling=5.0) |
However, in order to get timings before the XOR output, STA must be launched without these clock creation constraints.
Environment:
Here after the table of compliances for this testcase.
Variant | NG-MEDIUM NG-LARGE NG-ULTRA |
Embedded | Yes |
Simulation | No |
Attributes |
|
IP |
|
Methods | createClock |
Table: StaConstraint SpacewireTiming environment
Option: There is one option to check the impact of this constraint:
No option: no clock creation.
CreateClock: Both clocks are created.
NanoXmap check: After project launching, the user can get all needed timing paths in timing log files.
No option: no clock creation.
For Input to DIN:
| Code Block | ||
|---|---|---|
| ||
| Clock network delay to destination register:
| +-----------------------------------------+----------------------------------------+---------------+----------------+-----------------+
| | Source | Target/Net | Routing delay | Internal delay | Cumulated delay |
| +-----------------------------------------+----------------------------------------+---------------+----------------+-----------------+
| | Pin: spw_din.O | Net: spw_din | 7.329ns | - | 7.329ns |
| | Pin: LOGIC|lut_1[D]~csc~lut~exp[6:1].I2 | Pin: LOGIC|lut_1[D]~csc~lut~exp[6:1].O | - | 318ps | 7.647ns |
| | Pin: LOGIC|lut_1[D]~csc~lut~exp[6:1].O | Net: input_xor | 1.078ns | - | 8.725ns |
| +-----------------------------------------+----------------------------------------+---------------+----------------+-----------------+
| | Total | 8.407ns | 318ps | 8.725ns |
| +----------------------------------------------------------------------------------+---------------+----------------+-----------------+ |
CreateClock: Both clocks are created.
For Input to falling edge clock DFF:
| Code Block | ||
|---|---|---|
| ||
| RPath summary:
| +---------+----------------+------------------+------------+-------------------+--------------+--------+--------+
| | Slack | Source | Target | Data Delay | Latch Clock Delay | Hold/Removal | Depth | Note |
| +---------+----------------+------------------+------------+-------------------+--------------+--------+--------+
| | 6.764ns | Pin: spw_din.O | Pin: din_f_reg.I | 7.647ns | 1.167ns | -284ps | 1 | (-R) |
| +---------+----------------+------------------+------------+-------------------+--------------+--------+--------+
|
| Clock network delay to destination register:
| +-------------------------------+------------+---------------+----------------+-----------------+
| | Source | Target/Net | Routing delay | Internal delay | Cumulated delay |
| +-------------------------------+------------+---------------+----------------+-----------------+
| | Pin: LOGIC|lut_0[D]~csc~lut.O | Net: n15 | 1.167ns | - | 1.167ns |
| +-------------------------------+------------+---------------+----------------+-----------------+
| | Total | 1.167ns | 0ps | 1.167ns |
| +--------------------------------------------+---------------+----------------+-----------------+
|
| Data path detail:
| +------------------+-------------------+--------+--------+---------------+----------------+-----------------+--------------+-------------------+
| | Source | Target/Net | Module | Region | Routing delay | Internal delay | Cumulated delay | Hold/Removal | Latch Clock Delay |
| +------------------+-------------------+--------+--------+---------------+----------------+-----------------+--------------+-------------------+
| | Pin: spw_din.O | Net: spw_din | ~ | ~ | 7.647ns | - | 7.647ns | | |
| | Pin: din_f_reg.I | Pin: din_f_reg.CK | ~ | ~ | - | - | 7.647ns | -284ps | |
| +------------------+-------------------+--------+--------+---------------+----------------+-----------------+--------------+-------------------+
| | Total | 7.647ns | 0ps | 7.647ns | | 1.167ns |
| +--------------------------------------------------------+---------------+----------------+-----------------+--------------+-------------------+
| |
For Input to rising edge clock DFF:
| Code Block | ||
|---|---|---|
| ||
| RPath summary:
| +--------+----------------+------------------+------------+-------------------+----------------+--------+--------+
| | Slack | Source | Target | Data Delay | Latch Clock Delay | Setup/Recovery | Depth | Note |
| +--------+----------------+------------------+------------+-------------------+----------------+--------+--------+
| | 0ps | Pin: spw_din.O | Pin: din_r_reg.I | 7.784ns | 1.078ns | 337ps | 1 | (-R) |
| +--------+----------------+------------------+------------+-------------------+----------------+--------+--------+
|
| Clock network delay to destination register:
| +----------------------------------------+----------------+---------------+----------------+-----------------+
| | Source | Target/Net | Routing delay | Internal delay | Cumulated delay |
| +----------------------------------------+----------------+---------------+----------------+-----------------+
| | Pin: LOGIC|lut_1[D]~csc~lut~exp[6:1].O | Net: input_xor | 1.078ns | - | 1.078ns |
| +----------------------------------------+----------------+---------------+----------------+-----------------+
| | Total | 1.078ns | 0ps | 1.078ns |
| +---------------------------------------------------------+---------------+----------------+-----------------+
|
| Data path detail:
| +------------------+-------------------+--------+--------+---------------+----------------+-----------------+----------------+-------------------+
| | Source | Target/Net | Module | Region | Routing delay | Internal delay | Cumulated delay | Setup/Recovery | Latch Clock Delay |
| +------------------+-------------------+--------+--------+---------------+----------------+-----------------+----------------+-------------------+
| | Pin: spw_din.O | Net: spw_din | ~ | ~ | 7.784ns | - | 7.784ns | | |
| | Pin: din_r_reg.I | Pin: din_r_reg.CK | ~ | ~ | - | - | 7.784ns | 337ps | |
| +------------------+-------------------+--------+--------+---------------+----------------+-----------------+----------------+-------------------+
| | Total | 7.784ns | 0ps | 7.784ns | | 1.078ns |
| +--------------------------------------------------------+---------------+----------------+-----------------+----------------+-------------------+ |
Simulation check: No simulation environment is available for this testcase.
Board check: No board purpose for this testcase.