DSKEB KS10 - Cache Diagnostic Failure

[ks10fpga]

DSKEB KS10 - Cache Diagnostic Failure

[jfcl]

The current implementation does the following:

SMMON CMD - DSKEB
DSKEB - KS10 CACHE DIAGNOSTIC
VERSION 0.1, SV=0.3, CPU#=2020, MCV=130, MCO=470, HO=0, KASW=000000 000000

TTY SWITCH CONTROL ? - 0,S OR Y  - 0
SWITCHES = 000000 000000

PC=  032044
SWITCHES = 000000 000000
ERROR IN DSKEB - KS10 CACHE DIAGNOSTIC VERSION 0,1 - PHYSICAL EXEC CACHE CHECK
ACTUAL:   000000 001520
CACHE HITS WHEN MISSES EXPECTED

This is the expected results. The diagnostic measures the execution time of a simple loop with the cache enabled and with the cache disabled. The diagnostic expects the execution time of the un-cached loop to be longer than the cached loop.

As noted above, the KS10 FPGA uses single-cycle synchronous SRAM for main memory which operates as fast as a cache would - therefore the execution time is identical.

I could add a conditional compile which adds a wait-state to main memory when the cache was disable in order to provoke this diagnostic to pass.

[jfcl]

Won't fix.