EDMA3 Registers
11.4.1.4.2 Queue Status Registers (QSTATn)
The queue status registers (QSTATn) is shown in
and described in
Figure 11-63. Queue Status Register n (QSTATn)
31
25
24
23
21
20
16
Reserved
THRXCD
Reserved
WM
R-0
R-0
R-0
R-0
15
13
12
8
7
4
3
0
Reserved
NUMVAL
Reserved
STRTPTR
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 11-47. Queue Status Register n (QSTATn) Field Descriptions
Bit
Field
Value
Description
31-25
Reserved
0
Reserved. Always write 0 to this bit; writes of 1 to this bit are not supported and attempts to do so
may result in undefined behavior.
24
THRXCD
Threshold exceeded. THRXCD is cleared by writing a 1 to the corresponding QTHRXCDn bit in
the EDMA3CC error clear register (CCERRCLR).
0
Threshold specified by the Qn bit in the queue watermark threshold A register (QWMTHRA) has
not been exceeded.
1
Threshold specified by the Qn bit in the queue watermark threshold A register (QWMTHRA) has
been exceeded.
23-21
Reserved
0
Reserved. Always write 0 to this bit; writes of 1 to this bit are not supported and attempts to do so
may result in undefined behavior.
20-16
WM
0-10h
Watermark for maximum queue usage. Watermark tracks the most entries that have been in
queue n since reset or since the last time that the watermark (WM) bit was cleared. WM is cleared
by writing a 1 to the corresponding QTHRXCDn bit in the EDMA3CC error clear register
(CCERRCLR).
0-10h
Legal values are 0 (empty) to 10h (full).
11h-1Fh
Reserved.
15-13
Reserved
0
Reserved. Always write 0 to this bit; writes of 1 to this bit are not supported and attempts to do so
may result in undefined behavior.
12-8
NUMVAL
0-10h
Number of valid entries in queue n. The total number of entries residing in the queue manager
FIFO at a given instant. Always enabled.
0-10h
Legal values are 0 (empty) to 10h (full).
11h-1Fh
Reserved.
7-4
Reserved
0
Reserved. Always write 0 to this bit; writes of 1 to this bit are not supported and attempts to do so
may result in undefined behavior.
3-0
STRTPTR
0-Fh
Start pointer. The offset to the head entry of queue n, in units of entries. Always enabled. Legal
values are 0 (0th entry) to Fh (15th entry).
961
SPRUH73H – October 2011 – Revised April 2013
Enhanced Direct Memory Access (EDMA)
Copyright © 2011–2013, Texas Instruments Incorporated