Instruction manual

Table 46 300 Model SROM Power-On Sequence
LED Activity Meaning
FF Power is on, loading SROM code
into the DECchip 21064–AA
CPU, starting the memory sizing
routine.
Several possibilities: CPU’s clock, power,
DCOK, reset, IRQ, icMode, or other primordial
wiring is faulty; blank or unprogrammed
SROM.
FE SROM is not coded to send FE to
LEDs.
FD Memory sizing completed No memory detected or memory failure. Trap
to miniconsole.
FC SROM is not coded to send FC to
LEDs.
FB Initializing the 2 MB test range
of memory to zeroes. Executing
first of three memory tests.
Bcache references off. Dcache
off.
Not coded to stop here.
FA Completed first of three memory
tests. Executing second of three
memory tests. Bcache references
on. Dcache off.
Memory test failure. Fatal error. Trap to mini
console.
F9 Completed second of three
memory tests. Executing third
of three tests. Bcache references
off. Dcache on.
Memory test failure. Fatal error. Trap to mini
console.
F8 Completed third of three memory
tests. Executing SIR test.
Memory test failure. Fatal error. Trap to mini
console.
F7 SROM is not coded to send F7 to
LEDs.
F6 Appears briefly if an error is
signaled in the SIR. Executing
COREIO register test and init.
Not coded to stop here.
F5 Completed COREIO register test
and init.
Not coded to stop here.
F4 Fetched SYSROM header data.
Loading contents of SYSROM
into memory.
SYSROM header defective, bad data path to
SYSROM, I/O space access error, or blank
/corrupted SYSROM. Trap to mini-console.
(The mini-console is for Digital use only.)
F3 Completed load of SYS ROM
into memory. Fetching IOROM
header data.
Not coded to stop here.
F2 Fetched IOROM header data.
Loading contents of IOROM into
memory.
IOROM header defective, bad data path to
IOROM, I/O space access error, or blank
/corrupted IOROM. Trap to mini-console. (The
mini-console is for Digital use only.)
(continued on next page)
Powerup Initialization and Firmware Entry 14–3