29 Mar
2018
29 Mar
'18
11:24 a.m.
On the AXPpci33 board, the SROM is also an 8 bit device. What happens is that the CPU
reads in a bit stream into cache at power up reset, where the specific bit stream is
selected by the jumper position on the board. In effect the SROM can contain up to 8 bit
streams. Some of them will make use of the SROM console port.
29 Mar
29 Mar
4:40 p.m.
On the AXPpci33 board, the SROM is also an 8 bit device. What happens is
that the CPU reads in a bit stream into cache at power up reset, where the
specific bit stream is selected by the jumper position on the board. In
effect the SROM can contain up to 8 bit streams. Some of them will make use
of the SROM console port.
Thanks. The light bulb has gone on over my head at last! Each of the 8 bits
in the EPROM is a separate serial data stream. My ohmmeter confirms that the
data out pins on the 27C512 EPROM are connected directly to one side of the
bank of jumpers J1-J8.
In light of this, I've tried making sense of the EPROM data again but I still
don't see any ASCII strings (like "SROM" or "Powerup Sequence" for
example)
jumping out at me. Maybe the word size in the serial streams is not a multiple
of 8 bits or something odd like that or maybe I'm just making a mess of
assembling the bitstreams.
Regards,
Peter Coghlan.
2411
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