Datasheet

____________________________________________________ DS34T101, DS34T102, DS34T104, DS34T108
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15 Applications
15.1 Connecting a Serial Interface Transceiver
Figure 15-1 below shows the connection of one port of a DS34T10x chip to a serial interface transceiver such as
V.35 or RS-530. The figure shows one port in a DCE (Data Communications Equipment) application. All other ports
can be connected in the same way.
Each direction (Tx and Rx) has its own clock. However, TDM1_RCLK is optional, as the DS34T10x chip may work
in one clock mode (GCR1.CLKMO
DE=0) in which both directions are clocked by TDM1_TCLK. The clock source of
TDM1_RCLK or TDM1_TCLK can be:
 Internal (from the local oscillator)
 External
 Recovered from the packet network (provided by the chip on TDM1_ACLK).
The control input signal TDMn_RSIG_RTS does n
ot affect the data reception, but its value can be read by the CPU
from register field Port[n]_stat_reg1.R
TS.
The TDMn_TSIG_CTS an
d TDMn_TX_MF_CD outputs can be controlled by software using registers fields CTS
and CD in the Port[n]_cfg_reg regi
ster.
Figure 15-1. Connecting Port 1 to a Serial Transceiver
DS34T10x
TDM 1
_
A
CLK
SERIAL
INTERTFACE
TRANSCEIVER
(DCE MODE)
TDM
TDM 1
_
RX
TDM 1
_
TCLK
TDM 1
_
RCLK
TDM 1
_
TSIG
_
CTS
TDM 1
_
RSIG
_
RTS
TDM 1
_
TX
_
MF
_
CD
TX
RX
TCLK
RCLK
CTS
RTS
CD
INTERNAL
CLOCK
EXTERNAL
CLOCK