Dma Transfer - Samsung S3C2416 User Manual

S3C2416X RISC MICROPROCESSOR

5.2 DMA TRANSFER

In the DMA transfer mode, the transmitter or receiver FIFO are accessible by DMA controller. DMA service
request is activated internally by the transmitter or receiver FIFO state. The FTXEMPT, FRXEMPT, FTXFULL,
and FRXFULL bits of I2SCON register represent the transmitter or receiver FIFO data state. Especially,
FTXEMPT and FRXFULL bit are the ready flag for DMA service request; the transmit DMA service request is
activated when TXFIFO is not empty and the receiver DMA service request is activated when RXFIFO is not full.
The DMA transfer uses only handshaking method for single data. Note that during DMA acknowledge activation,
the data read or write operation should be performed.
* DMA request point
- TX mode : ( FIFO is not full ) & ( TXDMACTIVE is active )
- RX mode : ( FIFO is not empty ) & ( RXDMACTIVE is active )
23-4
NOTE
It only supports single transfer in DMA mode.
S3C2416X RISC MICROPROCESSOR