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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 |
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.
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.
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Once the initialization is done, the CMIC engine can be periodically activated to perform the following sequence:
Read configuration data
Calculate signature
Compare the signature with CMIC reference
If a mismatch is detected:
Calculate faulty address (BAD @) and faulty bit location
Read DATA[BAD @]
Repair flipped bit
Write DATA[BAD @]
For further information, please refer to the NX1H35AS CMIC Application note.
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Multiple devices addressing
Thanks to Device ID feature in the Bitstream Manager, it is possible to connect multiple devices on the same bus and load a bitstream only to the desired device.
In broadcast mode (0xFF), all connected devices will load the bitstream in the configuration memory.
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Bitstream Device ID is set during bitstream generation.
Chip Device ID is set by Bitstream Manager register.
Configuration modes usage
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