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參數(shù)資料
| 型號： | PCI4515ZHK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SINGLE SOCKET CARDBUS CONTROLLER WITH INTEGRATED |
| 中文描述： | 單插槽CardBus控制器，它集成 |
| 文件頁數(shù)： | 196/216頁 |
| 文件大?。?/td> | 1138K |
| 代理商： | PCI4515ZHK |
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92
9.2
Isochronous Receive Digital Video Enhancements
The DV frame sync and branch enhancement provides a mechanism in buffer-fill mode to synchronize 1394 DV data
that is received in the correct order to DV frame-sized data buffers described by several INPUT_MORE descriptors
(see
1394 Open Host Controller Interface Specification
, Release 1.1). This is accomplished by waiting for the
start-of-frame packet in a DV stream before transferring the received isochronous stream into the memory buffer
described by the INPUT_MORE descriptors. This can improve the DV capture application performance by reducing
the amount of processing overhead required to strip the CIP header and copy the received packets into frame-sized
buffers.
The start of a DV frame is represented in the 1394 packet as a 16-bit pattern of 1FX7h (first byte 1Fh and second
byte X7h) received as the first two bytes of the third quadlet in a DV isochronous packet.
9.3
Isochronous Receive Digital Video Enhancements Register
The isochronous receive digital video enhancements register enables the DV enhancements in the PCI4515
controller. The bits in this register may only be modified when both the active (bit 10) and run (bit 15) bits of the
corresponding context control register are 0. See Table 92 for a complete description of the register contents.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
Isochronous receive digital video enhancements
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Isochronous receive digital video enhancements
Type
R
R
RSC
RSC
R
R
RSC
RSC
R
R
RSC
RSC
R
R
RSC
RSC
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Offset:
Isochronous receive digital video enhancements
A80h
set register
A84h
clear register
Read/Set/Clear, Read-only
0000 0000h
Type:
Default:
Table 92. Isochronous Receive Digital Video Enhancements Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
3114
RSVD
R
Reserved. Bits 3114 return 0s when read.
13
DV_Branch3
RSC
When bit 13 is set to 1, the isochronous receive context 3 synchronizes reception to the DV frame start
tag in bufferfill mode if input_more.b = 01b, and jumps to the descriptor pointed to by frameBranch if
a DV frame start tag is received out of place. This bit is only interpreted when bit 12 (CIP_Strip3) is
set to 1 and bit 30 (isochHeader) in the isochronous receive context control register at OHCI offset
460h/464h (see Section 8.44) is cleared to 0.
12
CIP_Strip3
RSC
When bit 12 is set to 1, the isochronous receive context 3 strips the first two quadlets of payload. This
bit is only interpreted when bit 30 (isochHeader) in the isochronous receive context control register at
OHCI offset 460h/464h (see Section 8.44) is cleared to 0.
1110
RSVD
R
Reserved. Bits 11 and 10 return 0s when read.
9
DV_Branch2
RSC
When bit 9 is set to 1, the isochronous receive context 2 synchronizes reception to the DV frame start
tag in bufferfill mode if input_more.b = 01b, and jumps to the descriptor pointed to by frameBranch if
a DV frame start tag is received out of place. This bit is only interpreted when bit 8 (CIP_Strip2) is set
to 1 and bit 30 (isochHeader) in the isochronous receive context control register at OHCI offset
440h/444h (see Section 8.44) is cleared to 0.
8
CIP_Strip2
RSC
When bit 8 is set to 1, the isochronous receive context 2 strips the first two quadlets of payload. This
bit is only interpreted when bit 30 (isochHeader) in the isochronous receive context control register at
OHCI offset 440h/444h (see Section 8.44) is cleared to 0.
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