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Altera_Forum
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16 years ago

Tri_state_bridge not reading data bits [31..16] from SRAM

I have a custom board based on the Cyclone III FPGA Starter Kit. We have recently added SRAM using the IS61LP6432A, a 32 bit device. In SOPC Builder there is a tri-state bridge which con...
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Altera_Forum
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16 years ago

I tried changing the SOPC CFI flash component to 32-bit to see what would happen. This was even worse, as NIOS Flash Programmer couldn't access the CFI device.

I backed out of the changes and then discovered that my problem had gone away. I've no idea what changed. I'm now using the same .sof file as before and 32-bit accesses are working.

It's as if there was a dependency which was being ignored and my reversion gave it a nudge in the right direction :)

Then (before Daixiwen's reply) I ran the altera memtest and found 3 wrong pin assignments. This was partly due to using the reference design. So it's a respin of the PCB. :(