Server Gurus Discussions

[Alanjiang]

Hi,

When boundary scanning with SP3, EPYC Genoa CPU, IDCODE can response correctly with 0000 0000 0000 0010 1011 0000 0000 0011, aka 0x0002b003, but the response of SAMPLE/PRELOAD command is always all low, this is wrong.

Is the PRELOAD code wrong?

"SAMPLE (00011011),"& -- 8'h1b
"PRELOAD (00011011),"& -- 8'h1b

Is a SVF SIR to be shifted-in to access boundary scan registers first?

Thank you verify much.

[Alanjiang]

Hi, 

We are studying GENOA boundary scan test, When boundary scanning with SP5, EPYC Genoa CPU sp5, IDCODE can response correctly with 0000 0000 0000 0010 1011 0000 0000 0011, aka 0x0002b003, but the response of SAMPLE/PRELOAD command is always all low, this is wrong.

Is the PRELOAD code wrong?

"SAMPLE (00011011),"& -- 8'h1b
"PRELOAD (00011011),"& -- 8'h1b

Is a SVF or SIR to be executed to access boundary scan registers first?

I found 2 special instructions from BSDL file.

"SELECTDIE (00000011),"& -- 8'h03
"PINTEST (00011000),"& -- 8'h18

Do we have to execute the 2 SIR to access boundary scan register?

Thank you verify much.

[Alanjiang]

I corrected CPU series is SP5. (GENOA SP5, OLGA6096)

We read the output of CPU. And we found B67(RESET_L) and pin D69(PWROK) have been low after the board powered-up.

What do these 2 signals mean?