Registers
1469
SPRUH91D – March 2013 – Revised September 2016
Copyright © 2013–2016, Texas Instruments Incorporated
Universal Serial Bus 2.0 (USB) Controller
31.4.89 Queue Manager Queue N Status Register A (QSTATA[0]-QSTATA[63])
The queue manager queue
N
status register A (QSTATA[
N
]) is an optional register that is only
implemented for a queue if the queue supports entry/byte count feature. The entry count feature provides
a count of the number of entries that are currently valid in the queue. It does not support byte accesses.
The queue manager queue
N
status register A (QSTATA[
N
]) is shown in
and described in
Figure 31-115. Queue Manager Queue N Status Register A (QSTATA[N])
31
16
Reserved
R-0
15
14
13
0
Reserved
QUEUE_ENTRY_COUNT
R-0
R-0
LEGEND: R = Read only; -
n
= value after reset
Table 31-119. Queue Manager Queue N Status Register A (QSTATA[N]) Field Descriptions
Bit
Field
Value
Description
31-14
Reserved
0
Reserved
13-0
QUEUE_ENTRY_COUNT
0-3FFFh
This field indicates how many packets are currently queued on the queue.
31.4.90 Queue Manager Queue N Status Register B (QSTATB[0]-QSTATB[63])
The queue manager queue
N
status register B (QSTATB[
N
]) is an optional register that is only
implemented for a queue if the queue supports a total byte count feature. The total byte count feature
provides a count of the total number of bytes in all of the packets that are currently valid in the queue. It
does not support byte accesses. The queue manager queue
N
status register B (QSTATB[
N
]) is shown in
and described in
.
Figure 31-116. Queue Manager Queue N Status Register B (QSTATB[N])
31
28
27
16
Reserved
QUEUE_BYTE_COUNT
R-0
R-0
15
0
QUEUE_BYTE_COUNT
R-0
LEGEND: R = Read only; -
n
= value after reset
Table 31-120. Queue Manager Queue N Status Register B (QSTATB[N]) Field Descriptions
Bit
Field
Value
Description
31-28
Reserved
0
Reserved
27-0
QUEUE_BYTE_COUNT
0-FFF FFFFh
Indicates how many bytes total are contained in all of the packets which are currently
queued on this queue.