cxd3220r Sony Electronics, cxd3220r Datasheet - Page 33

• Manufacturer Part Number: cxd3220r
• Description: Ieee1394 Link/transaction Layer Controller Lsi For Sbp-2
• Manufacturer: Sony Electronics

6-5. CXD3220R Data Format
6-5-1. Asynchronous Transmit
The following are the four basic formats for Asynchronous data during transmit.
6-5-1-1. No-data Transmit
The data format for no-data transmit is shown below.
The first quadlet contains packet control information. The second and third quadlets contain 16-bit Destination
ID and 48-bit Destination Offset for request, or Response code for response.
No-data Transmit Fields
a) No-data Packets (Used for Quadlet Read requests and all Write responses.)
b) Quadlet Packets (Used for Quadlet Write requests, Quadlet Read responses and Block Read requests.)
c) Block Packets (Used for Lock requests, Lock responses, Block Write requests and Block Read responses.)
d) Unformatted data
imm
spd
tLabel
rt
tCode
priority
destinationID
destinationOffsetHigh,
destinationOffsetLow
rCode
Quadlet Read Request Transmit Format
Write Response Transmit Format
Field Name
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Immediately tries to transmit continuously after Acknowledge is sent, if "1" is set.
(Used for Phy Read and Lock Response.)
Transmit speed
Transaction Label. Used as a pair with response packet relative to request packet.
This packet's Retry code.
This packet's Transaction code.
This packet's Priority level.
For values other than "0", the transmitter uses Priority Arbitration relative to this packet.
Indicates this packet's Destination bus number in 10 bits and the Node number in 6 bits.
These two continuous areas indicate Destination Node address space address.
This address must be in quadlet units.
Response code for write response packet.
00: 100Mbps; 01: 200Mbps; 10: 400Mbps; 11: Reserved
00: Retry_1; 01: Retry_X, 10: Retry_A, 11: Retry_B
destinationID
destinationID
destinationOffsetLow
spd
spd
– 33 –
rCode
Description
tLabel
tLabel
destinationOffsetHigh
rt
rt
tCode
tCode
priority
priority
0
0
CXD3220R