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Altera_Forum
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15 years ago

Question : Avalon OpenCores 10/100 Ethernet MAC TX problem

Hi All, I am experiencing strange behaviour with the transmit side of the OCM version 9.1, I have created a sof for a Cyclone II custom board that includes a Nios II/f, 16MB SDRAM (32bit datab...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Before I do finish for the day, attached are a couple of screen grabs illustrating missing 16 bit values on a hand crafted packet (set to 0x11 0x12 0x13 etc) . 32bit alignment does make a difference, but only in the sense of which/where the 16 bit value is getting lost.

Right now I don't know if it's a MAC to PHY or MAC to SDRAM issue. Any thoughts?