參數(shù)資料
型號： TSB12C01APZ
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)： 32/59頁
文件大?。?/td> 275K
代理商： TSB12C01APZ
4–2
4.1.2
The block-transmit format is shown in Figure 4–2. The first quadlet contains packet-control information. The
second and third quadlets contain the 64-bit address. The first 16 bits of the fourth quadlet contains the
dataLength field. This is the number of bytes of data in the packet. The remaining 16 bits represent the
extended_tCode field. (See Table 6–11 of the IEEE 1394-1995 standard for more information on
extended_tCodes.) The block data, if any, follows the extended_tCode. Block write responses are identical
to the quadlet write response and use the format described in subsection 4.1.3.
Block Transmit
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
destinationID
destinationOffsetHigh
destinationOffsetLow
dataLength
extended_tCode
block data
Figure 4–2. Block-Transmit Format
Table 4–2. Block-Transmit Format Functions
FIELD NAME
DESCRIPTION
spd
This field indicates the speed at which this packet is to be sent. 00 = 100 Mb/s, 01 = 200 Mb/s,
and 10 = 400 Mb/s, and 11 is undefined for this implementation.
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 IEEE 1394-1995 standard).
priority
The priority level for this packet. For cable implementation, the value of the bits must be 0.
For backplane implementation, see clause 5.4.1.3 and 5.4.2.1 of the IEEE 1394-1995
standard.
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.
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
The number of bytes of data to be transmitted in the packet.
extended_tCode
This field is 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
The data to be sent. If dataLength is 0, no data should be written into the FIFO for this field.
Regardless of the destination or source alignment of the data, the first byte of the block must
appear in byte 0 of the first quadlet.
4.1.3
The quadlet-receive format is shown in Figure 4–3. The first 16 bits of the first quadlet contain the destination
node and bus id, and the remaining 16 bits contain packet-control information. The first 16 bits of the second
Quadlet Receive
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