MB86613S Datasheet, PDF (112/134 Pages) Fujitsu Component Limited. – IEEE1394 Open HCI Controller

Preliminary
8.2.2. Descriptor
This section describes the format of descriptor processed by AR- CPC. The descriptor that AR- CPC handles
is only INPUT_MORE command.
cmd
=2
s
key
=0
i b3
reqCount
dataAddress
branchAddress
Z
xferStatus
resCount
Fig. 8.9 INPUT_MORE descriptor Format
Bit size Field Name
description
----- -------------- -----------------------------------------------------------
4
cmd
Set ”2h” meaning to ”INPUT MORE” command.
1
s
The result is stored in xferStatus and resCount fields.
3
key
Always set ”0h” in this field.
2
i
It controls the interrupt event (IntEvent.ARRQ and .ARRS bits). reported after
the descriptor is processed.
”11b” makes to report the interrupt.
”00b” does not report the interrupt.
”10b” and ”01b” are unspecified codes.
2
b
Always set ”11b” in this field.
16
reqCount
Set the data byte count to be stored in host memory in a multiple of 4.
32
dataAddress
Set the start address of host memory.
28
branchAddress
Set the address of host memory where the next descriptor to be processed is
stored. The setting is valid only when Z field contains ”1”.
4
Z
Set ”1h” if the next descriptor to be processed is existing.
Set ”0h” if no outstanding descriptor is existing.
16
xferStatus
This field indicates the result of process every packet to store in the host
memory, in ARContextControl register format.
16
resCount
Set the byte count of the host memory where the packet is to be stored with a
multiple of 4. This field indicates the remaining byte count of host memory while
storing the received packet into the host memory.
111