ADSP-214xx SHARC Processor Hardware Reference 9-37
Digital Application/Digital Peripheral Interfaces
indicates the signal type. When the protocol changes, output (signal) type
is noted.
For audio applications, the ADSP-214xx processors need information
about interrupt sources that correspond to waveforms (not event signals).
As a result, the falling edge of the waveform may be used as an interrupt
source as well. Programs may select any of these three conditions:
• Latch on the rising edge
• Latch on the falling edge
• Latch on both the rising and falling edge
Table 9-8 shows which interrupts are valid on rising and or falling edges
Use of the DAI_IMASK_RE or DAI_IMASK_FE registers allows programs to
notice and respond to rising edges, falling edges, both rising and falling
edges, or neither rising nor falling edges so they can be masked separately.
Table 9-8. DAI/DPI Interrupt Valid Edges
Interrupt Source DAI_IMASK_RE DAI_IMASK_FE
S/PDIF Rx Yes Yes
IDP_FIFO Yes No
IDP_DMA Yes No
SRC Mute Out Yes Yes
Miscellaneous (31–22) Yes Yes
DPI_IMASK_RE DPI_IMASK_FE
UART Channel Bits 3–0 Yes No
TWI Bits (4) Yes No
Miscellaneous Interrupt Bits
(5–13)
Yes Yes
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