RM0319 datasheet(295/368 Pages) STMICROELECTRONICS

tên linh kiện	RM0319

Giải thích chi tiết về linh kiện	SPEAr320S architecture and functionality

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295 / 368 page

RM0319

Digital audio port (I2S)

Doc ID 022640 Rev 3

295/368

27.7.3

Programming FIFO thresholds

The I2S controller has programmable thresholds for the transmit and the receive FIFOs.

Changing the thresholds changes the frequency of the interrupts received. To reprogram

levels during operation, write to:

●

The transmit channel empty trigger (TXCHET) bits of the transmit FIFO configuration

●

The receive channel data trigger (RXCHDT) bits of the receive FIFO configuration

27.7.4

Exchanging data with system memory

System DMAC can also be used to transfer data to and from the I2S IP; DMA request and

clear lines perform the handshake with DMAC.

The internal interrupt mechanism implements DMAC handshaking.

●

Tx: interrupt intr_emp_tx is generated upon reaching the threshold value. This interrupt

also results in the generation of a DMA request to DMAC.

●

Rx: a DMA request is generated at the assertion of interrupt intr_da_rx.

The DMAC clears the request lines.

RM0319 bảng dữ liệu(PDF) 295 Page - STMicroelectronics