Technical data

CHALLENGE/Onyx Diagnostic Road Map 2-15
D chips on the IP21
board. Look for error
indicators on other
boards to help isolate
the source of the
problem.
If none of bits 7, 8 or
9 are set, look for
error indicators on
other boards for a
possible source of the
error.
If none of bits 7, 8 or
9 are set and no errors
are indicated on other
boards, then the IP21
board introduced the
error in the path
between the EBUS and the
DB chip.
+ 2:A Chip Addr Parity 7 Indicates a parity Error
on A_ADDR[23:0], The A
chip sent something to
the CC chip containing a
parity error. Need to
interrogate other bits
to determine the cause
of the error:
If bit 5 (Address Error
on MyReq on EBus Channel
0) or bit 6 (Address
Error on MyReq on EBus
Wback channel) are
asserted in conjunction
with bit 2, the error
was introduced by the
EBus. Look for error
indicators on other
boards.
If neither bit 5 nor 6
is asserted, the error
was introduced between
the A and the CC chip
+ 3:Time Out on MyReq on EBus Channel 0
+ 4:Time Out on MyReq on EBus Wback Channel
7 Read Request sent to A
chip, never made it to
the EBUS. Indi- cates a
problem between CC and A
chip, a problem with the
A chip, or the A Chip