Samsung S3C2500B User Manual page 59

S3C2500B
Group Pin Name
HDLC0 HTXD0/DU
(8)
HRXD0/DD
HnDTR0/BCL/
GPIO42
HnRTS0/STRB/
GPIO43
Table 1-1. S3C2500B Signal Descriptions (Continue)
Pin Type Pad Type
1 I/O
1 I/O
1 I/O
1 I/O
phbsud4 IOM2 Data Upstream. Open Drain Output and
schmit trigger input.
HDLC Ch-0 Transmit Data.
The serial data output from the transmitter is
encoded in NRZ/NRZI/ FM/Manchester data
format.
phbsud4 IOM2 Data Down Stream. Open Drain Output
and schmit trigger input.
HDLC Ch-0 Receive Data.
The serial data input should be coded in
NRZ/NRZI/FM/Manchester data form at. The
data should not exceed the rate of the
S3C2500B internal master clock.
phbst8 IOM2 bit clock, 768 KHz.
HDLC Ch-0 Data Terminal Ready.
NDTR0 output indicates that the data terminal
device is ready for transmis sion and
reception.
General I/O Port.
phbst8 IOM2 Data Strobe. 8 KHz programable signal
for selecting an 8-bit timeslot or 16 bit
timeslot.
HDLC Ch-0 Request To Send.
The nRTS0 output is controlled by the Tx
Request to send control bit. When the TxRTS
bit is set to '1' , the nRTS output is driven log.
When the TxRTS bit is clear to '0' , the nRTS
output remains still low until 1) when the
sending frame is reached to end, and 2) when
there is no more data in the TxFIFO for
sending a new frame.
General I/O Port.
PRODUCT OVERVIEW
Description
1-25