SN250 datasheet(60/130 Pages) STMICROELECTRONICS

60 / 130 page

Functional description—application modules

SN250

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SC1_DMACTRL [0x4498]

0-R

SC_

TXDMARST

SC_

RXDMARST

SC_TXLODB

SC_TXLODA

SC_RXLODB

SC_RXLODA

0-R

0-W

0-RW

SC_TXDMARST

[5]

Setting this bit will reset the transmit DMA. The bit is autocleared.

SC_RXDMARST

[4]

Setting this bit will reset the receive DMA. This bit is autocleared.

SC_TXLODB

[3]

Setting this bit loads DMA transmit buffer B addresses and starts the DMA controller

processing transmit buffer B. This bit is autocleared when DMA completes. Writing a

zero to this bit will not have any effect. Reading this bit as one indicates DMA

processing for buffer B is active or pending. Reading this bit as zero indicates DMA

processing for buffer B is complete or idle.

SC_TXLODA

[2]

Setting this bit loads DMA transmit buffer A addresses and starts the DMA controller

processing transmit buffer A. This bit is autocleared when DMA completes. Writing a

zero to this bit will not have any effect. Reading this bit as one indicates DMA

processing for buffer A is active or pending. Reading this bit as zero indicates DMA

processing for buffer A is complete or idle.

SC_RXLODB

[1]

Setting this bit loads DMA receive buffer B addresses and starts the DMA controller

processing receive buffer B. This bit is autocleared when DMA completes. Writing a

zero to this bit will not have any effect. Reading this bit as one indicates DMA

processing for buffer B is active or pending. Reading this bit as zero indicates DMA

processing for buffer B is complete or idle.

SC_RXLODA

[0]

Setting this bit loads DMA receive buffer A addresses and starts the DMA controller

processing receive buffer A. This bit is autocleared when DMA completes. Writing a

zero to this bit will not have any effect. Reading this bit as one indicates DMA

processing for buffer A is active or pending. Reading this bit as zero indicates DMA

processing for buffer A is complete or idle.

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