參數(shù)資料
型號(hào): TSB43AA82A1
廠商: Texas Instruments, Inc.
英文描述: 1394 integrated PHY and link layer controller(1394集成PHY和鏈路層控制器)
中文描述: 1394綜合物理層和鏈路層控制器(1394集成物理層和鏈路層控制器)
文件頁數(shù): 76/146頁
文件大?。?/td> 597K
代理商: TSB43AA82A1
410
4.5.2
MRF/CRF Short Format
Setting MShtFmt and CShtFmt on ORB fetch control (44h) records the ORB in shortened format. This enables the
FIFO to be used effectively and speeds up read access. The MRF/CRF received short format is shown in Figure 412
The first quadlet contains packet-control information. The first 16 bits of the second quadlet contain the bus and node
number of source, and the last 16 bits of the second quadlet and all of the third quadlet contain the 48-bit,
quadlet-aligned ORB offset address. All remaining quadlets contain data that is used only for write requests and read
responses. For block read requests and block write responses, the data field is omitted. The packets in the MRF/CRF
registers are accessed through the MRF read register at 84h and CRF read register at 88h.
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
status
rCode
Reserved
spd
next_tLabel (only for CRF)
tLabel
ack
source ID
ORB_Offset_offset_high
ORB_offset_low
ORB
15 16 17
0
1
2
3
4
5
6
7
8
9
10 11 12
13 14
18 19 20
21 22 23
24 25 26
27 28 29
30 31
Figure 412. MRF/CRF Receive Short Format (ORB)
4.5.3
MRF/CRF Long Format
The MRF/CRF received long format is shown in Figure 413. Table 410 contains a description of each field.
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
status
Reserved
spd
next_tLabel (only for CRF)
Reserved
Ack
destination ID
tLabel
rt
tCode
prior
source ID
rCode
Reserved
Reserved
data_length
extended_tCode
ORB
Reserved
ORB_offset_high
ORB_offset_low
13 14
15 16 17
0
1
2
3
4
5
6
7
8
9
10 11 12
18 19 20
21 22 23
24 25 26
27 28 29
30 31
Figure 413. MRF/CRF Receive Long Format (ORB)
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