MB86613S Просмотр технического описания (PDF) - Fujitsu

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MB86613S

IEEE1394 Open HCI Controller

Fujitsu 

Preliminary

8.4.2. Descriptor

This section describes the format of descriptor processed by IR- CPC. The descriptor(s) that IR- CPC han-

dles are INPUT_MORE command and INPUT_LAST command.

cmd s key

=2

=0

ib w

reqCount

dataAddress

branchAddress

Z

xferStatus

resCount

Fig. 8.19 INPUT_MORE descriptor Format

cmd s key

=3

=0

ib w

reqCount

dataAddress

branchAddress

Z

xferStatus

resCount

Bit size Field Name

----- --------------

4

cmd

Fig. 8.20 INPUT_LAST descriptor Format

description

-----------------------------------------------------------

”2h” means ”INPUT_MORE” command.

”3h” means ”INPUT_LAST” command.

1

s

This flag is valid only for packet- per- buffer mode.

”1b” stores the result of execution in the xferStatus and resCount fields.

”0b” does not store the result of execution in the xferStatus and resCount fields.

3

key

Always set ”0h”.

2

i

This field controls the interrupt event (IntEvent.IsochRx bit) reported after the

descriptor is processed.

”11b” makes to report the interrupt.

”00b” does not report the interrupt.

”10b” and ”01b” are unspecified codes.

In packet- per- buffer mode, only the ” i ” field of INPUT_LAST command is valid.

2

b

For buffer- fill mode:

Always set ”11b”.

For packet- per- buffer mode :

Set ”00b” for INPUT_MORE command.

Set ”11b” for INPUT_LAST command.

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