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PCI7421 Datasheet(PDF) 219 Page - Texas Instruments

Part # PCI7421
Description  DUAL SINGLE SOCKET CARDBUS AND ILTRAMEDIA CONTROLLER WITH INTEGRATED 1304-A - CONTROLLER WITH DEDICATED FLASH MEDIA SOCKET
PDF  298 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCI7421 Datasheet(HTML) 219 Page - Texas Instruments

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8−39
8.41 Asynchronous Context Command Pointer Register
The asynchronous context command pointer register contains a pointer to the address of the first descriptor block
that the PCI7x21/PCI7x11 controller accesses when software enables the context by setting bit 15 (run) in the
asynchronous context control register (see Section 8.40) to 1. See Table 8−32 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
Asynchronous context command pointer
Type
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
Default
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Asynchronous context command pointer
Type
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
Default
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Register:
Asynchronous context command pointer
Offset:
18Ch
[ATRQ]
1ACh
[ATRS]
1CCh
[ARRQ]
1ECh
[ARRS]
Type:
Read/Write/Update
Default:
XXXX XXXXh
Table 8−32. Asynchronous Context Command Pointer Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
31−4
descriptorAddress
RWU
Contains the upper 28 bits of the address of a 16-byte aligned descriptor block.
3−0
Z
RWU
Indicates the number of contiguous descriptors at the address pointed to by the descriptor address.
If Z is 0, then it indicates that the descriptorAddress field (bits 31−4) is not valid.



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