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SERIAL 1/0 PERIPHERAL INTERFACE CLOCK SELECT
The Recei ve Clock (RxC) and Transmi t Clock (TxC) for the two Am9551
serial I/O devices are jumper selectable.
The clock inputs for serial
port 1 can be jumpered together to the on-board clock source, or
separately connected to external RxC and TxC.
The clock source for
serial port 2 is on-board onlye
Table 2-2 lists the jumper locations.
TABLE 2-2e
SERIAL I/O JUMPERS
SIGNAL
FUNCTION
JUMPER
I/O CONNECTIONS
RxC-1
Ext" Rcv Clk #1
147-161
P4-22
TxC-1
Ext" Xmit Clk
111
146-160
P4-14
RTS-1
Request to Send #1
132-134 (Active)
P4-9
130A-134 (Ground)
None
CTS-1
Clear to Send #1
133-135 (Active)
P4-7
131-133 (Ground)
None
CTS-2
Clear to Send #2
180-181 (Active)
P5-7
181-179 (Ground)
None
CLK-1
Baud Rate Clk #1
141-143 (9600 Baud)
None
142-143 (Prog.)
None
CLK-2
Baud Rate Clk #2
39-140 (9600 Baud)
None
138-139 (Prog.)
None
P4 is Serial Port #1.
P5 is Serial Port #2, (Modified RS232C)
BAUD RATE SELECT
The Am96/4116A baud rate is programmable us i ng two of the counters in
the Am9513 System Timing Controller.
As shipped from the factory, the
baud rate is set at 9600.
Table 2-2 lists the clock source jumpers.
Tab
1
e 3-5
1
i sts the va
1
ues for programmi ng other baud rates, us i ng
asynchronous communications mode.
CUSTOMIZING DATA SET OPERATION
The Cl ear to Send and Request to Send signa
1
s, between a data set or
data terminal can be jumpered to external signals or can be jumpered to
ground (to be continuously active).
Table 2-2 lists these jumpers.
Table 2-3 lists pin assignments for the serial I/O connectors, P4 (port
1) and P5 (port 2), serial port 2 is the modified RS232C port.
2-4
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