Yo,
Okay after more looking I’m looking for a member that has an understanding of the R14000 and R16000 MIPS CPU connection to SRAM (Secondary Cache Memory).
Going through the errors I got there is a tight pattern. I’m trying to find real documentation but only found a few for other MIPS processors. They claim there MAY be some kind of external multiplexer to interact with the external cache (it’s not a direct track from CPU to SRAM). Can anyone give more info on this? Because this feels like a solder joint/bad connection or a damaged IC that performs the interaction between the CPU register signalling and the actual addressing of the external CACHE. If so, I might find a bad IC or reflow something to see if the communication lines clear up…doesn’t seem that random…but I have no info on how the CPU couples to secondary SRAM? Anyone know?
Patterns from log above:
Code:
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002008 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000009 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000200 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000010 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000200 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000020 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000020 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000200 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000080 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000020 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000200 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000200 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000020 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000020 (Way 0)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000000 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000010 (Way 0)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000001000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000002000 (Way 0)
Address : 0x0000000000000800 (Way 0)
Address : 0x0000000000000400 (Way 0)
Address : 0x0000000000000100 (Way 0)
Address : 0x0000000000000001 (Way 1)
Address : 0x0000000000000001 (Way 1)
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 70 0000000040000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 10 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 20 0000002000000000 0000000000000000 000
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 20 0000002000000000 0000000000000000 000
Syndrome : 10 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 10 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 20 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 10 0000002000000000 0000000000000000 000
Syndrome : 50 0000002000000000 0000000000000000 000
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 10 0000000040000000 0000000000000000 000
Syndrome : 00 4000000040000000 0000000000000000 000
Syndrome : 00 0000008000000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 00 0000000040000000 0000000000000000 000
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 70 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 000008a000000000 0000000000000000 000
Syndrome : 20 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 20 0000082000000000 0000000000000000 000
Syndrome : 10 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 10 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 10 0000002000000000 0000000000000000 000
Syndrome : 70 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000082000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 00 0000002000000000 0000000000000000 000
Syndrome : 30 0000002000000000 0000000000000000 000
SRAM on this PIMM is a
0436A4CBLBB
Found the datasheet at:
https://www.datasheetarchive.com/pdf/dow...436A4CBLBB
This PIMM has a huge amount of test points so I guess I can try to locate the SRAM pin and backtrace into something?
NEED -> 