參數(shù)資料
型號: TSB12LV01APZ
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): 44/71頁
文件大?。?/td> 267K
代理商: TSB12LV01APZ
4–6
4.2
The format of the isochronous-transmit packet is shown in Figure 4–5. The data for each channel must be
presented to the isochronous-transmit FIFO interface in this format in the order that packets are to be sent.
The transmitter requests the bus to send any packets available at the isochronous-transmit interface
immediately following reception or transmission of the cycle-start message.
Isochronous Transmit (Host Bus to TSB12LV01A)
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
chanNum
spd
sy
isochronous data
dataLength
TAG
Figure 4–5. Isochronous-Transmit Format
Table 4–5. Isochronous-Transmit Functions
FIELD NAME
DESCRIPTION
dataLength
This field indicates the number of data bytes in this packet
TAG
This field indicates the format of data carried by the isochronous packet (00 = formatted, 01 =
IEC 61883 CIP headers, 10 and 11 are reserved).
chanNum
This field carries the channel number with which this data is associated.
spd
This field contains the speed at which to send this packet.
sy
This field carries the transaction layer-specific synchronization bits.
isochronous data
This field contains the data to be sent with this packet. The first byte of data must appear in byte
0 of the first quadlet of this field. If the last quadlet does not contain four bytes of data, the unused
bytes should be padded with zeros.
4.3
The format of the isochronous-receive data is shown in Figure 4–6. The data length, which is found in the
header of the packet, determines the number of bytes in an isochronous packet.
Isochronous Receive (TSB12LV01A to Host Bus)
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
chanNum
tCode
sy
isochronous data
dataLength
TAG
P
spd
WriteCount
errCode
1 0 1 0
Figure 4–6. Isochronous-Receive Format
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