Xerox WorkCentre 385 Service Manual page 157

Signal PIN No.
CnEBSY 162
CnEMSG 163
VCLK[1:0] 164, 165
nENGPRQ 166
nENGHSYNC 169
nCPUPSYNC 170
WorkCentre 385
Table 2: KS32C6100 Signal Descriptions
Type
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 from the KS32C6100. When CnEBSY
is active, the STATUS data is sent, synchronized with COM-
CLK.
I Not engine message. This input signal is used by the printer
engine to send a 1-byte status message in response to a com-
mand from the KS32C6100. When CnEBSY is active, the STA-
TUS data is sent, synchronized with COMCLK.
I Video shift clock. The VCLK input is a free-running signal that
is used to drive transfers of video data. The two VCLK signals
can supplied by the laser printer engine or by an on-PBA oscil-
lator.
I Not page synchronize signal request.
The nENGPRQ input informs the KS32C6100 that the LBP
engine is ready to receive the nCPUPSYNC signal. When the
printer engine receives the nCPUPRINT command from the
KS32C6100, it enables nENGPRQ within a preset time inter-
val. nENGPRQ is disabled whenever the nCPUPSYNC level
goes active Low.
I Not engine horizontal synchronize. The nENGHSYNC input is
used to synchronize signals with the horizontal scanning line of
a printer engine. A new line starts with each nENGHSYNC
pulse. When nENGHSYNC goes active, the KS32C6100 sends
one row of data to the engine, thereby maintaining synchroni-
zation with video out (VIDEO_OUT).
O Not page synchronize. The nCPUPSYNC output is used to
synchronize signals with the print of one page. The printer
engine waits until nCPUPSYNC goes active. After a predeter-
mined time interval has elapsed, the KS32C6100 must send
image data synchronized with nENGHSYNC.
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Description
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Circuit Description