I am digging way back to the early 2000's here. Before AMD bought-out ATI.
I am looking for the document that details the M9 processor JTAG commands.
I am trying to identify the root cause of failure for a video graphics card that we use in one of our products. I would like to perform a memory test of the GPU's (M9-CSP64) on board memory. I get flickering artifacts in a particular, but random (depending on the failing card I'm testing), location on the display. The product databook mentions the ability to run this test, and many others, using the JTAG port. Unfortunately there are no details of the JTAG, or JTAG commands, other than the XOR tree function.