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參數(shù)資料
| 型號： | TSB12C01AWN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High-Speed Serial-Bus Link-Layer Controller |
| 中文描述： | 高速串行總線鏈路層控制器 |
| 文件頁數(shù)： | 34/59頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TSB12C01AWN |
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4–4
responses. For block read requests and block write responses, the data field is omitted. The last quadlet
contains packet-reception status.
0
1 2
3
4
5 6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
spd
tLabel
rt
tCode
priority
sourceID
destinationOffsetHigh
destinationOffsetLow
block data (if any)
ackSent
destinationID
dataLength
extended_tCode
Figure 4–4. Block-Receive Format
Table 4–4. Block-Receive Format Functions
FIELD NAME
DESCRIPTION
destinationID
This is the concatenation of the 10-bit bus number and the 6-bit node number that forms the
node address to which this packet is being sent.
tLabel
This field is the transaction label, which is a unique tag for each outstanding transaction
between two nodes. This is used to pair up a response packet with its corresponding request
packet.
rt
The retry code for this packet is 00 = new, 01 = retry_X, 10 = retryA, and 11 = retryB.
tCode
tCode is the transaction code for this packet. (See Table 6–10 of the IEEE 1394-1995
standard).
priority
This field contains the priority level for this packet. For cable implementation, the value of the
bits must be zero. For backplane implementation, see clause 5.4.1.3 and 5.4.2.1 of the
IEEE 1394-1995 standard.
sourceID
This is the node ID of the sender of this packet.
destination OffsetHigh,
destination OffsetLow
The concatenation of these two fields addresses a quadlet in the destination node’s address
space. This address must be quadlet aligned (modulo 4). The upper four bits of the
destination OffsetHigh field are used as the response code for lock-response packets and
the remaining bits are reserved.
dataLength
For write request, read responses, and locks, this field indicates the number of bytes being
transferred. For read requests, this field indicates the number of bytes of data to be read. A
write-response packet does not use this field. Note that the number of bytes does not include
the head, only the bytes of block data.
extended_tCode
The block extended_tCode to be performed on the data in this packet. See Table 6–11 of the
IEEE 1394-1995 standard.
block data
This field contains any data being transferred for this packet. Regardless of the destination
address or memory alignment, the first byte of the data appears in byte 0 of the first quadlet
of this field. The last quadlet of this field is padded with zeros out to four bytes, if necessary.
spd
This field indicates the speed at which this packet was sent. 00 = 100 Mb/s, 01 = 200 Mb/s,
10 = 400 Mb/s, and 11 is undefined for this implementation.
ackSent
This field holds the acknowledge sent by the receiver for this packet.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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