NAME

memrbus.diag − Test all memory cards in the system. 

DESCRIPTION

This diagnostic verifies that the data path to the memory from the R-Bus is functional by writing a pattern to the memory and reading it back to verify that the correct values are written.  There is no direct path from the IPU to the R-Bus.  Thus the floating point unit’s VRF (vector register file) is used to pass data to and from the memory using the R-Bus. 

This test assumes that the memory itself has been thoroughly tested using mem.diag and only verifies the ability of the R-Bus to access the memory for reading. 

DETAILS

None Required. 

BOARDS THAT MUST BE INSTALLED

This test needs a known good CPU card, a known good I/O board for downloading the diagnostic, and at least one memory card.  All memory cards found in the system are tested. 

SPECIAL COMMAND LINE PARAMETERS

None

MENU ITEMS SPECIFIC TO THIS TEST

ptRun RBus memory pattern testing. 

INTERPRETING THE ERROR CODES

The following errors may be generated by this test.  (The actual error wording may differ, however the type of error is as summarized here.) 

<no
No memory boards were found.

160
The data read back was not the same as the data that was written. The failing addresses, the actual data read and the expected data are reported.

170
When a read error occurs, this test retries the read.  If it happens that the read passes on the second try, this error is reported in addition to ERROR 160.

September 02, 1992