Samsung MSYS 5200, Service Manual

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S I G N A L PIN No. Type Description
SIO_RXD 153 I Receive data input for the serial I/O. Rxd is the SIO’s input signal 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].
n A U TO F D 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.
n A C K 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.
SELECT 17 O Parallel port select. The SELECT output signal indicates
whether the device connected to the KS32C6100 parallel port is
“on-line” or “off-line”.
P E R R O R 18 O Parallel port paper error. PERROR output indicates that a problem exists
with the paper in the laser printer. It could indicate that the printer has a
paper jam or that the printer is out of paper.
nFA U LT 19 O Not fault. The nFA U LT output indicates that an error condition exists
with the laser printer. This signal can be used to indicate that the printer
is out of toner or to inform the user that the printer is not turned on.
PPD[7:0] 3~10 I/O Parallel port data bus. This 8-bit, tri-state bus is used to exchange data
between the KS32C6100 and an external host (peripheral).
C O M C L K 158 O Command clock. COMCLK is used to synchronize command data that
the KS32C6100 sends to the printer engine, as well as the status
messages that the KS32C6100 receives from the printer engine.
Whenever the KS32C6100 receives status data, it selects itself
(COMCLK) as the source of the synchronization signal. Whenever the
KS32C6100 sends a command, the data is synchronized with COMCLK.
CnPBSY 160 O Not command busy. This output signal indicates that the KS32C6100 is
sending command data to the printer engine. When CnPBSY goes active,
the command data, which is COMCLK, is sent to the engine.
C n P M S G 161 O Not command message. The CnPMSG output is used to send a one-byte
command, synchronized with COMCLK, to the printer engine.
The command data from the KS32C6100 is sent MSB-first.
CnEBSY 162 I Not engine busy. This signal indicates whether or not the laser printer
engine ready to send a 1-byte status message in response to a command
f rom the KS32C6100. When CnEBSY is active, the STA TUS data is sent,
synchronized with COMCLK.
Table 1-1 KS32C6100 Signal Descriptions (Cont.)
5-12 Samsung Electronics
Circuit Description