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Feb 10 11:01 1988   slotfn.h Page 1




This describes the appearance of the processor module
as seen by other modules on the CSS bus.

Read status Register:
An automatic register may be read (byte or long) at physical address
offset:Oxfffffffc.

The register is "automatic" because it responds without assistance
from the processor.
31-------------24 23---------21       20   19   18--16 15-------8 7-------------0
+----------------+--------------+----+----+------+----------+-----------------+
I                 I              I     cmd            I                     (board id)     I
I   unpredictable lipl2 ipl1 iplO halt pend 1 1 1     I   mail reg   I   0 0 0 0 0 0 1 0   I

+----------------+--------------+----+----+------+----------+-----------------+
ipl2,1,0 reflect the (low true) value at the processor input
halt=O indicates the processor has a double bus error
cmd-pend=l indicates the command buffer is full
mail reg is loaded by the processor at BUS MAIL BYTE.

Command register:
Commands to read or write are accepted at
offset:Ox??????OO
(where? represents 4 don't care bits),
as required by the CS8 Bus Specification.
The register captures four bytes of address and four bytes of data.
The data captured from a read command is not predictable.
Receiving a command,
except the automatic read,
causes a Non-Maskable Interrupt to be asserted
at the processor, and the cmd-pend bit to be set.
The processor's firmware is expected to respond to the command.
Further commands cannot be received until the processor
increments its ready-count on the arbiter.
HARDWARE LIMITATIONS: Since the equipment for sending DATA RESPONSEs
is not usable while the processor is
executing from main memory or testing cache or mmu,
read commands are not recommended as part of the normal protocol.
Also, the type value is not captured, so the module has no easy way to tell
an arriving read from a write command.
                                            I.t-   '1\
                                           l--\ r             . \.
Feb 10 11:01 1988   slotfn.h Page 2         l      1_._".,,_.....

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