User`s guide

The XMI
Figure 2–30 Hexword Data Return with Uncorrectable Read Error
012345
FUNCT
DATA
ID
CONF
ARB
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|GRD0|GRD1|RER | |
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| |ACK |ACK |ACK |
|RESP|HOLD|HOLD|
|DAT0|DAT1|
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|CMDR|CMDR|CMDR|
msb−p182−89
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2.5.11.3 Longword and Quadword Writes
Longword and quadword writes can be either Write Mask or Unlock Write
Mask transactions.
Longword and quadword writes move the number of bytes specified by the
Mask field. The commander arbitrates for the XMI bus and, upon winning
it, drives the appropriate write command, the intended address, the data
mask, its own ID, and asserts HOLD to signal that it will need the next
cycle as a write data cycle. It then provides the write data but no ID field,
having identified itself in the command cycle. Cycles 3 and 4 show the
confirmation from the responder.
Figure 2–31 Longword and Quadword Writes
01234
FUNCT
DATA
ID
CONF
ARB
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|CMD |WDAT|
|WRTM|DATA|
|CMDR|CMDR|
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| |ACK |ACK |
|CMDR|HOLD|
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msb−p183−89
2–50