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SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
(Pin Assignment Table)
CPU pins identified with an asterisk are active when LOW.
Centronics signals preceded by an 'n'are active when LOW.
Pin Name
I/O
Drive
R3710/40 Interface
SYSCLK ∗
I
SYSRESET ∗
I
IODATA [7:0]
I/O
4mA
IOA [3:2]
I
IOCS ∗
I
IOWR ∗
I
IORD ∗
I
INTERRUPT ∗
O
4mA
R3710/40 Centronics Peripheral Status Signals
nACK
I
BUSY
I
nFAULT
I
PERROR
I
SELECT
I
Modified Centronics Peripheral Status Signals
pld_nACK
O
18mA
pld_BUSY
O
18mA
pld_nFAULT
O
18mA
pld_PERROR
O
18mA
pld_SELECT
O
18mA
Centronics Host Status Signals
nSELECTIN
I
nSTROBE
I
nAUTOFD
I
nINIT
I
Modified Centronics Host Status Signals
pld_nSELECTIN
O
4mA
pld_nSTROBE
O
4mA
pld_nAUTOFD
O
4mA
pld_nINIT
O
4mA
System Clock: connects directly to the CPU SYSCLK ∗ output.
System Reset: resets the R3741 to its initial state.
Input/Output Device Data: connects directly to bits [7:0] of Bidirectional I/O Data bus.
Input/Output Address Bus: connect to two (2) I/O address lines.
Input/Output Chip Select: connects to a chip select for the 8-bit I/O data bus.
Input/Output Device Write: connects directly to R3710/40 IOWR ∗ .
Input/Output Device Read: connects directly to R3710/40 IORD ∗ .
Interrupt: indicates detection of an initialization strobe during compatibility mode. Should be connected to
an R3710/40 interrupt line.
R3710/40 Centronics Acknowledge: connects directly to the R3710/40 CACK ∗ signal.
R3710/40 Centronics Busy: connects directly to the R3710/40 CBUSY signal.
R3710/40 Centronics Fault: connects directly to the R3710/40 CFAULT ∗ signal.
R3710/40 Centronics Peripheral Error: connects directly to the R3710/40 CPERROR signal.
R3710/40 Centronics Select: connects directly to the R3710/40 CSELECT signal.
modified Centronics Acknowledge: connects to the Centronics connector nACK signal through a series
resistor (may be buffered).
modified Centronics Busy: connects to the Centronics connector Busy signal through a series resistor
(may be buffered).
modified Centronics Fault: connects to the Centronics connector nFAULT signal through a series resistor
(may be buffered).
modified Centronics Peripheral Error: connects to the Centronics connector PERROR signal through a
series resistor (may be buffered).
modified Centronics Select: connects to the Centronics connector Select signal through a series resistor
(may be buffered).
Centronics Selectin: connects to the Cintronics connector nSELECTIN signal (may be connected to an
external buffer first).
Centronics Strobe: connects to the Centronics connector STROBE signal (may be connected to an
external buffer first).
Centronics Auto Feed: connects to the Centronics connector nAUTOFD signal (may be connected to an
external buffer first).
Centronics Initializtion: connects to the Centronics connector nINIT signal (may be connected to an
external buffer first).
modified Selectin: connects directly to R3710/40 CSELECTIN ∗ signal.
modified Strobe: connects directly to R3710/40 CSTROBE ∗ signal.
modified Auto Feed: connects directly to R3710/40 CAUTOFD ∗ signal.
modified Initialzation: connects directly to R3710/40 CINIT ∗ signal.
13 – 12
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