USB Registers
16.5.5.2 TDFDQ Register (offset = 4h) [reset = 0h]
TDFDQ is shown in
and described in
.
Figure 16-153. TDFDQ Register
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
TD_DESC_QMGR
TD_DESC_QNUM
R/W-0h
R/W-0h
7
6
5
4
3
2
1
0
TD_DESC_QNUM
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 16-165. TDFDQ Register Field Descriptions
Bit
Field
Type
Reset
Description
13-12
TD_DESC_QMGR
R/W
0h
This field controls which of the 4 Queue Managers the DMA will
access in order to allocate a channel teardown descriptor from the
teardown descriptor queue.
11-0
TD_DESC_QNUM
R/W
0h
This field controls which of the 2K queues in the indicated queue
manager should be read in order to allocate channel teardown
descriptors.
CPPI DMA Teardown Free Descriptor Queue Control Register
1930
Universal Serial Bus (USB)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated