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USB Registers
16.5.7.113 QUEUE_19_C Register (offset = 2138h) [reset = 0h]
QUEUE_19_C is shown in Figure 16-389 and described in Table 16-403.
Figure 16-389. QUEUE_19_C Register
31 30 29 28 27 26 25 24
HEAD_TAIL Reserved
W-0
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved PACKET_SIZE
R/W-0
7 6 5 4 3 2 1 0
PACKET_SIZE
R/W-0
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 16-403. QUEUE_19_C Register Field Descriptions
Bit Field Type Reset Description
31 HEAD_TAIL W-0 0 Head/Tail Push Control.
Set to zero in order to push packet onto tail of queue and set to one
in order to push packet onto head of queue.
13-0 PACKET_SIZE R/W-0 0 packet_size This field indicates packet size and is assumed to be
zero on each packet add unless the value is explicitly overwritten.
This field indicates packet size for packet pop operation.
2221
SPRUH73H–October 2011–Revised April 2013 Universal Serial Bus (USB)
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