PCI7621 Datasheet, PDF (219/298 Pages) Texas Instruments – DUAL SINGLE SOCKET CARDBUS AND ILTRAMEDIA CONTROLLER WITH INTEGRATED 1304-A - CONTROLLER WITH DEDICATED FLASH MEDIA SOCKET

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
Name
Type
Default
Bit
Name
Type
Default
31
RWU
X
15
RWU
X
30
RWU
X
14
RWU
X
29
RWU
X
13
RWU
X
28
RWU
X
12
RWU
X
27
RWU
X
11
RWU
X
26 25 24 23 22 21
Asynchronous context command pointer
RWU RWU RWU RWU RWU RWU
X
X
X
X
X
X
10
9
8
7
6
5
Asynchronous context command pointer
RWU RWU RWU RWU RWU RWU
X
X
X
X
X
X
20
RWU
X
4
RWU
X
19
RWU
X
3
RWU
X
18
RWU
X
2
RWU
X
17
RWU
X
1
RWU
X
16
RWU
X
0
RWU
X
BIT
31−4
3−0
Register:
Offset:
Type:
Default:
Asynchronous context command pointer
18Ch [ATRQ]
1ACh [ATRS]
1CCh [ARRQ]
1ECh [ARRS]
Read/Write/Update
XXXX XXXXh
Table 8−32. Asynchronous Context Command Pointer Register Description
FIELD NAME
descriptorAddress
Z
TYPE
RWU
RWU
DESCRIPTION
Contains the upper 28 bits of the address of a 16-byte aligned descriptor block.
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.
8−39