s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 303
s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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S3C4510B
Receiver DMA Mode
To use DMA operation without CPU intervention, you have to make Rx buffer descriptor chain in advance. And
set the DMA Rx buffer descriptor pointer (DMARxPTR) register to the address of the first buffer descriptor of the
chain, and then DMA Rx channel should be enabled.
HARDWARE FLOW CONTROL
When nCTS is active and there exists data to be transmitted in Tx FIFO, nRTS enters Low, allowing data
transmission. At the beginning of the data is an open flag while at the end a closing flag. If the frame being
transferred discontinues, nRTS goes back to the High after the data transmission is completed.
When the condition of nCTS is shifted from Low to High, it is detected at the falling edge of Tx clock, where
nRTS also goes High. For about 5 to 13 cycles after nRTS enters High, the data transmission continues. nRTS
remains High for a maximum of 22 cycles and goes back to the Low condition if there remains any data to be
transmitted in HTxFIFO. If nCTS is still High even when nRTS went back to Low, not the data in HTxFIFO but a
mark idle pattern is transmitted when AutoEn bit set to one.
TxClock
TxClock
RTS
CTS
RTS
CTS
TxD
TxD
Data
Figure 8-8. CTS Lost during Transmission
Figure 8-7. nCTS Already Asserted
5-13 cycles
14 - 22 cycles
last
HDLC CONTROLLERS
8-17
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