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Altera_Forum
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14 years ago

Strange problem with IORD_16DIRECT

Hi, I have a 16-bit pio (input) in my sopc and I want to access the data through IORD_16DIRECT. The data shown on the port is 0x00, 0x01, 0x02....0xff (verified through signaltap). However, th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

The PIO doesn't contain bytenables so any access to it should be atomic and not split into multiple transactions by the fabric.

I recommend you use the access macros that come with the PIO so that you don't have to worry about your offsets. IORD_16DIRECT uses 2 byte offsets by the way. The macros are defined in "altera_avalon_pio_regs.h" in the directory: \ip\sopc_builder_ip\altera_avalon_pio\inc