EDMA3 Registers
11.4.1.7.6 Interrupt Evaluate Register (IEVAL)
The interrupt evaluate register (IEVAL) is the only register that physically exists in both the global region
and the shadow regions. In other words, the read/write accessibility for the shadow region IEVAL is not
affected by the DMA/QDMA region access registers (DRAEm/DRAEHm, QRAEn/QRAEHn). IEVAL is
needed for robust ISR operations to ensure that interrupts are not missed by the CPU.
The IEVAL is shown in
and described in
Figure 11-98. Interrupt Evaluate Register (IEVAL)
31
16
Reserved
R-0
15
2
1
0
Reserved
Rsvd
EVAL
R-0
W-0
W-0
LEGEND: R = Read only; W = Write only; -n = value after reset
Table 11-82. Interrupt Evaluate Register (IEVAL) Field Descriptions
Bit
Field
Value
Description
31-2
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.
1
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.
0
EVAL
Interrupt evaluate.
0
No effect.
1
Causes EDMA3CC completion interrupt to be pulsed, if any enabled (IERn/IERHn = 1) interrupts are
still pending (IPRn/IPRHn = 1).
The EDMA3CC completion interrupt that is pulsed depends on which IEVAL is being exercised. For
example, writing to the EVAL bit in IEVAL pulses the global completion interrupt, but writing to the EVAL
bit in IEVAL0 pulses the region 0 completion interrupt.
986
Enhanced Direct Memory Access (EDMA)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated