CP3SP33SMSSLASHNOPB datasheet(225/407 Pages) TI1

225 / 407 page

Shift Data

(STD/SRD)

High-impedance

Unused Slots

Slot1

Frame

Slot0

Long Frame Sync

(SFS/SRFS)

Data

(ignored)

Data

(ignored)

Data

(valid)

DS055

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

Figure 24-3. Network Mode Frame

24.2.3.4 Interrupt Support

If DMA is not enabled for a receive slot n (RXDSAn = 0), all data received in this slot is loaded into the

receive FIFO. The interrupt request is asserted as soon as the number of data bytes or words in the

receive FIFO is greater than a programmable warning limit.

If DMA is not enabled for a transmit slot n (TXDSAn = 0), all data to be transmitted in this slot are read

from the transmit FIFO. The interrupt request is asserted as soon as the number data bytes or words

available in the transmit FIFO is equal or less than a programmable warning limit.

Because the interrupt request can be handled by either the CPU or DSP interrupt controllers, the interrupt

request is passed through the Audio Subsystem Controller (ASC), which is programmed to route it to the

interrupt controller. To use the codec interrupt, it must be enabled at three levels:

•

AAI module—the interrupt must be enabled in the AISCR register.

•

ASC module—the AAI interrupt is assigned to ASC interrupt channel 7, so bit 7 in the ASCINTSEL

•

Interrupt controller—the interrupt request must be enabled in the interrupt controller. For the CPU

interrupt controller, this is interrupt request IRQ27

24.2.3.5 DMA Support

If DMA support is enabled for a receive slot n (RXDSA0 = 1), all data received in this slot is only

transferred from the ARSR into the corresponding DMA receive register (ARDRn). A DMA request is

asserted when the ARDRn register is full.

If DMA is enabled for a transmit slot n (TXDSAn = 1), all data to be transmitted in slot n are read from the

corresponding DMA transmit register (ATDRn). A DMA request is asserted to the DMA controller when the

ATDRn register is empty

Figure 24-4 illustrates the data flow for IRQ and DMA support in network mode, using four slots per frame

and DMA support enabled for slots 0 and 1 in receive and transmit direction.

Advanced Audio Interface

225

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