cxd1944r Sony Electronics, cxd1944r Datasheet - Page 15

• Manufacturer Part Number: cxd1944r
• Description: Ieee1394 3-port 200mbps Cable Transceiver/arbiter
• Manufacturer: Sony Electronics

The request type field is encoded as follows:
Request Type Field
Request Speed Field
NOTE:
The CXD1944R does not support 400Mbps and over.
LREQ [1 : 3]
000
001
010
011
100
101
110 to 111
LREQ [4 : 5]
The request speed field is encoded as follows:
00
01
10
11
ImmReq
IsoReq
PriReq
FairReq
RdReq
WrReg
Reserved
Data Rate
100Mbps
200Mbps
400Mbps
>400Mbps
Name
Take control of the bus immediately upon detecting idle; do not arbitrate. Used
for acknowledge transfers.
Arbitrate for the bus; no gaps. Used for isochronous transfers.
Arbitrate after a subaction gap; ignore fair protocol. Used for cycle start
packet.
Arbitrate after a subaction gap, following fair prototcol. Used for fair transfers.
Return specified register contents through status transfer.
Write to specified register.
Ignored.
–15–
Meaning
CXD1944R