Circuit Description
12/98
7 - 21
WorkCentre 385
UCLK
156
I
The external UART clock source input. Usually, MCLK is used
as the UART clock source.
RXD
151
I
Receive data input for the UART. RXD is the UART’s input sig-
nal for receiving serial data.
DTR
149
I
Data terminal ready. DTR input signals the KS32C6100 that the
peripheral (or host) is ready to transmit or receive serial data.
TXD
150
O
Transmit data output for the UART. TXD is the UART’s output
for transmitting serial data.
DSR
148
O
Data set ready. DSR output signals the host (peripheral) that
the KS32C6100 UART is ready to transmit or receive serial
data.
SIO_RXD
153
I
Receive data input for the serial I/O. Rxd is the SIO’s input sig-
nal for receiving serial data.
SIO_TXD
152
O
Transmit data input for the serial I/O. TXD is the SIO’s output
for transmitting serial data.
nSELECTIN
11
I
Not select information. This input signal is used by parallel port
interface to request “on-line” status information.
nSTROBE
12
I
Not strobe. The nSTROBE input indicates when valid data is
present on the parallel port data bus, PPD[7:0].
nAUTOFD
13
I
Not autofeed. The nAUTOFD input indicates whether data on
the parallel port data bus, PPD[7:0], is an autofeed command.
Otherwise, the bus signal are interpreted as data only.
nINITIAL
14
I
Not initialization. This input signal initializes the parallel port’s
input control.
nACK
15
O
Not parallel port acknowledge. The nACK output signal is
issued whenever a transfer on the parallel port data bus is
completed.
BUSY
16
O
Parallel port busy. The BUSY output signal indicates
that the KS32C6100 parallel port is currently busy.
Table 2: KS32C6100 Signal Descriptions
Signal
PIN No.
Type
Description
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