USB Registers
16.5.7.2 QMGRRST Register (offset = 8h) [reset = 0h]
QMGRRST is shown in
and described in
Figure 16-278. QMGRRST Register
31
30
29
28
27
26
25
24
HEAD_TAIL
Reserved
DEST_QNUM
W-0
W-0
23
22
21
20
19
18
17
16
DEST_QNUM
W-0
15
14
13
12
11
10
9
8
Reserved
SOURCE_QNUM
W-0
7
6
5
4
3
2
1
0
SOURCE_QNUM
W-0
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 16-292. QMGRRST Register Field Descriptions
Bit
Field
Type
Reset
Description
31
HEAD_TAIL
W-0
0
Indicates whether queue contents should be merged on to head or
tail of destination queue.
Clear this field for head and set for tail.
29-16
DEST_QNUM
W-0
0
Destination Queue Number
13-0
SOURCE_QNUM
W-0
0
Source Queue Number Queue Manager Queue Diversion Register
Note : CBA write transactions to this register cause the QMGR to
start processing an internal state machine.
This disables CBA read transactions.while it is busy processing the
state machine.
Once the state machine is back in the idle state
CBA read transactions are available again.
2110
Universal Serial Bus (USB)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated