參數(shù)資料
型號(hào)： 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)： 31/59頁
文件大小： 275K
代理商： TSB12C01APZ
4–1
4 TSB12C01A Data Formats
The data formats for transmission and reception of data are shown in the following sections. The transmit
format describes the expected organization of data presented to the TSB12C01A at the host-bus interface.
The receive formats describe the data format that the TSB12C01A presents to the host-bus interface.
4.1
Asynchronous transmit refers to the use of the asynchronous-transmit FIFO (ATF) interface. The
general-receive FIFO (GRF) is shared by asynchronous data and isochronous data. There are two basic
formats for data to be transmitted and received. The first is for quadlet packets, and the second is for block
packets. For transmits, the FIFO address indicates the beginning, middle, and end of a packet. For receives,
the data length, which is found in the header of the packet, determines the number of bytes in a block packet.
Asynchronous Transmit (Host Bus to TSB12C01A)
4.1.1
The quadlet-transmit format is shown in Figure 4–1. The first quadlet contains packet control information.
The second and third quadlets contain the 64-bit, quadlet-aligned address. The fourth quadlet is data used
only for write requests and read responses. For read requests and write responses, the quadlet data field
is omitted.
Quadlet 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
quadlet data (for write request and read response)
Figure 4–1. Quadlet-Transmit Format
Table 4–1. Quadlet-Transmit Format
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
destination node address of this packet.
destination OffsetHigh,
destination OffsetLow
The concatenation of these two fields addresses a quadlet in the destination nodes address
space. This address must be quadlet aligned (modulo 4).
quadlet data
For write requests and read responses, this field holds the data to be transferred. For write
responses and read requests, this field is not used and should not be written into the FIFO.
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