AMT Datasouth Accel-7350, Service Manual

Page: 72 / 119

71
Port Explanation
(1) X0,X1(Input): Terminal for oscillator (25 MHz)
(2) XRESET(Input): Reset signal input.
(3) A0-A22(Output): Address bus.
(4) D0-D7(I/O): Data bus.
(5) XRD, XWR(Output): Read signal, write signal.
(6) A19/A18, A17/A16(Output): Address for DRAM.
(7) XRAS, XCAS(Output): Signal for DRAM control.
(8) SYSCLK (Output):12.5 MHz (Original oscillation frequency of 25 MHz is divided into 2).
(9) HRQ(Input), XHAK(Output): DMA request, hold acknowledge. Refer to DMA item for details.
(10) Interrupt input(All input)
INT0: HA encoder input
INT1: Home sensor input
INT2: HA encoder input
INT3: Sensor interrupt input (For detection by tractor sensor, home sensor and cover open)
DRE0: Power cutoff input
DRE1: Centronics interface initial interrupt input
DRE2: Centronics interface data receiving interrupt input
DRE3: C motor position interrupt input
(11) XCS03(Output): Chip select output to gate array BBG030
(12) SCK0(Input): Basic clock input for serial transmitting and receiving signal
(13) SIN0(Input): SOUT0(Output): Data input and output of serial data interface.
(14) PB0-PB3: connect with EEPROM. Refer to EEPROM item for details.
(15) Analog input
AN0: Detection of head temperature
AN1: Detection of Jam sensor (front/rear)
AN2: Detection of paper edge
AN3: Detection of paper sensor, skew sensor and slide volume
(16) P11-P17: LCD data bus.
(17) P50, P53, P61, P65: LCD control.
(18) TOUT0(Output): Clock output for LF motor drive
(19) TOUT1(Output): Clock for C motor drive