PC97338VLJ datasheet(31/221 Pages) NSC

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RTS1

RTS2

Group 7

Requests to Send 1 and 2. When low, this output signal indicates

to the modem or data transfer device that the appropriate UART is

ready to exchange data.

The RTS signal can be set to active low by programming bit 1

(RTS) of the Modem Control Register (MCR) to a high level. A

Master Reset operation sets this signal to its inactive (high) state.

Loop mode operation holds this signal to its inactive state.

RTS1 is multiplexed with BADDR0.

RTS2 is multiplexed with A14.

SIN1

SIN2

Group 1

Serial Input data 1 and 2. These UART input signals receive

composite serial data from the communications link (peripheral

device, modem, or data transfer device).

SIN2 is multiplexed with IRRX1.

SIRQI1

SIRQI2

SIRQI3

Group 1

System IRQ Input signals 1, 2 and 3. These input signals can be

routed to one of the following output pins: IRQ7-3 or IRQ12-9.

SIRQI2 and SIRQI3 can also be routed to IRQ15. Software

configuration determines to which output pin the input signal is

routed.

SIRQI1 is multiplexed with IRQ15 and DRQ3.

SIRQI2 is multiplexed with DRATE1, MSEN1, CS0 and DACK3.

SIRQI3 is multiplexed with DRV2, PNF, DR23 and IRSL2.

SLCT

Group 2

Select. This parallel port input signal is set high by the printer when

it is selected.

This pin is grounded by an internal nominal 25 K

Ω pull-down

resistor.

SLCT is multiplexed with WGATE.

SLIN

I/O

Group 11

Select Input. When this parallel port signal is low, it selects the

external printer. This signal enters TRI-STATE within 10 nsec after

a 0 is loaded into the corresponding Control Register bit.

An external 4.7 K

Ω pull-up resistor to V

CC must be connected to

this pin.

SLIN is multiplexed with ASTRB, STEP. See Table 72 for more

information.

SOUT1

SOUT2

Group 7

Serial Output signals 1 and 2 These UART output signals send

composite serial data to the communications link (peripheral device,

modem, or data transfer device). The SOUT signal is set to a

marking state (logic 1) after a Master Reset operation.

SOUT1 is multiplexed with BADDR1 (and BOUT1 in PC87338).

SOUT2 is multiplexed with IRTX, CFG0 (and BOUT2 in PC87338).

STB

I/O

Group 11

Strobe. This output signal indicates to the printer that valid data is

available at the parallel port. This pin enters TRI-STATE within 10

nsec after a 0 is loaded into the corresponding Control Register bit.

An external 4.7 K

Ω pull-up resistor to V

CC must be connected to

this pin.

STB is multiplexed with WRITE. See Table 72 for more information.

STEP

(Normal

Mode)

Group 10

Step. This FDC output signal issues pulses to the disk drive at a

software programmable rate to move the head during a seek

operation.

Symbol

PQFP

TQFP

I/O and

Group #

Function

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