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Pin Assignment Table <ASIC: R3741>
CPU pins identified with an asterisk are active when LOW.
Centronics signals preceded by an ‘n’ are active when LOW.
Pin No.
Pin Name
Signal Name
I/O
Description
ASIC: GT-32011 interface
43
SYSCLK
∗
BSYCLK2
I
System Clock: connects directly to the CPU SYSCLK* output.
1
SYSRESET
∗
RESETO
I
System Reset: resets the R3741 to its initial state.
16, 24:29
IODATA[7:0]
IODATA[7:0]
I/O
Input/Output Device Data: connects directly to bits [7:0] of the Bidirectional
I/O Data bus.
I/O Data bus.
5, 8
IOA[3:2]
A[3:2]
I
Input/Output Address Bus: connect to two (2) I/O address lines.
4
IOCS
∗
CS3741
I
Input/Output Chip Select: connects to a chip select for the 8-bit I/O data bus.
6
IOWR
∗
IOWR
I
Input/Output Device Write: connects directly to ASIC: GT-32011 IOWR
∗
.
18
IORD
∗
IORD
I
Input/Output Device Read: connects directly to ASIC: GT-32011 IORD
∗
.
31
INTERRUPT
∗
INT1284
O
Interrupt: indicates detection of an initialization strobe during compatibility
mode. Should be connected to an ASIC: GT-32011 interrupt line.
mode. Should be connected to an ASIC: GT-32011 interrupt line.
ASIC: GT-32011 Centronics Peripheral Status Signals
2
nACK
CENTACK
I
ASIC: GT-32011 Centronics Acknowledge: connects directly to the ASIC:
GT-32011 CACK
GT-32011 CACK
∗
signal.
13
BUSY
CENTBUSY
I
ASIC: GT-32011 Centronics Busy: connects directly to the ASIC: GT-32011
CBUSY signal.
CBUSY signal.
20
nFAULT
CENTFAULT
I
ASIC: GT-32011 Centronics Fault: connects directly to the ASIC: GT-32011
CFAULT
CFAULT
∗
signal.
11
PERROR
CENTPERROR
I
ASIC: GT-32011 Centronics Peripheral Error: connects directly to the ASIC:
GT-32011 CPERROR signal.
GT-32011 CPERROR signal.
17
SELECT
CENTSELECT
I
ASIC: GT-32011 Centronics Select: connects directly to the ASIC:
GT-32011 CSELECT signal.
GT-32011 CSELECT signal.
Modified Centronics Peripheral Status Signals
38
pld_nACK
PALACK
O
modified Centronics Acknowledge: connects to the Centronics connector
nACK signal through a series resistor (may be buffered if desired).
nACK signal through a series resistor (may be buffered if desired).
40
pld_BUSY
PALAUTOFD
O
modified Centronics Busy: connects to the Centronics connector Busy signal
through a series resistor (may be buffered if desired).
through a series resistor (may be buffered if desired).
37
pld_nFAULT
PALFAULT
O
modified Centronics Fault: connects to the Centronics connector nFAULT
signal through a series resistor (may be buffered if desired).
signal through a series resistor (may be buffered if desired).
14
pld_PERROR
PALERROR
O
modified Centronics Peripheral Error: connects to the Centronics connector
PERROR signal through a series resister (may be buffered if desired).
PERROR signal through a series resister (may be buffered if desired).
34
pld_SELECT
PALSELECT
O
modified Centronics Select: connects to the Centronics connector Select
signal through a series resistor (may be buffered if desired)
signal through a series resistor (may be buffered if desired)
Centronics Host Status Signals
21
nSELECTIN
CENTSELIN
I
Centronics SelectIn: connects to the Centronics connector nSELECTIN
signal (may be connected to an external buffer first, if desired).
signal (may be connected to an external buffer first, if desired).
9
nSTROBE
CENTSTROBE
I
Centronics Strobe: connects to the Centronics connector STROBE signal
(may be connected to an external buffer first, if desired).
(may be connected to an external buffer first, if desired).
7
nAUTOFD
CENTAUTOFD
I
Centronics Auto Feed: connects to the Centronics connector nAUTOFD
signal (may be connected to an external buffer first, if desired).
signal (may be connected to an external buffer first, if desired).
12
nINIT
N9
I
Centronics Initialization: connects to the Centronics connector nINIT signal
(may be connected to an external buffer first, if desired).
(may be connected to an external buffer first, if desired).
Modified Centronics Host Status Signals
36
pld_nSELECTIN
PALSELIN
O
modified SelectIn: connects directly to ASIC: GT-32011 CSELECTIN* signal.
33
pld_nSTROBE
PALSTROBE
O
modified Strobe: connects directly to ASIC: GT-32011 CSTROBE* signal.
39
pld_nAUTOFD
PALAUTOFD
O
modified AutoFeed: connects directly to ASIC: GT-32011 CAUTOFD* signal.
19
pld_nINIT
IORD
O
modified Initialization: connects directly to ASIC: GT-32011 CINIT* signal.
– 33 –
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