Texas Instruments XIO2213B Evaluation Module / Reference Design XIO2213BEVM XIO2213BEVM Datenbogen
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XIO2213BEVM
SCPS210F – OCTOBER 2008 – REVISED MAY 2013
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 controller accesses when software enables the context by setting bit 15 (run) in
the asynchronous context control register (see
descriptor block that the controller accesses when software enables the context by setting bit 15 (run) in
the asynchronous context control register (see
) to 1b. See
for a complete
description of the register contents.
OHCI register offset:
18Ch
(ATRQ)
1ACh
(ATRS)
1CCh
(ARRQ)
1ECh
(ARRS)
Register type:
Read/Write/Update
Default value:
XXXX XXXXh
BIT NUMBER
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RESET STATE
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
BIT NUMBER
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET STATE
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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 0h, it indicates that the descriptorAddress field (bits 31-4) is not valid.
address. If Z is 0h, it indicates that the descriptorAddress field (bits 31-4) is not valid.
168
1394 OHCI Memory-Mapped Register Space
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