Panasonic KX-P7100 4.4.17. Internal Engine I / F (Control CPU - Engine CPU)

4.4.17. Internal Engine I / F (Control CPU - Engine CPU)
The communication I/F signal between Control CPU and Engine CPU in main board is as follows.
PPRDY: PrinterEngine had been Powered On.
nPRDY: Engine status is ready for communication.
nTOP: A vertical synchronous signal which indicates the home position in a recording sheet.
nHSYNC: A horizontal synchronous signal which indicates the home position of horizontal laser scanning.
nPRINT: After receiving this signal from RIP CPU, the engine starts printing. By other words, print request.
nVIDEO: Video image data which modulate laser beam.
nPURGE: Paper purge signal which asserted when the paper exit to the tray.
nPSAVE: Engine power save command signal.
CXD: Serial command data from RIP to ECU.
SXD: Serial Status data from ECU to RIP.
nCBSY: Data transfer busy signal from RIP to ECU.
nSBSY: Data transfer busy signal from ECU to RIP.
CCLK: Communication clock for those serial data. ( RIP assert )
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KX-P7100