PC Processors

[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 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]

corrected the CPU is SP5 series.

[elstaci]

Try posting at AMD SERVER GURUS which deals with everything to do with AMD EPYC Processors from here: https://community.amd.com/t5/server-gurus/ct-p/amd-server-gurus

[Alanjiang]

got it, thanks.

the message was left you forum and we didn't get a response. Thank you very much.

[elstaci]

For your information only here is AMD Tech Documentation that might be helpful concerning the EPYC processors: https://www.amd.com/en/support/tech-docs?keyword=epyc

[Alanjiang]

thanks for you reply. you message is helpful to solve the problem.