PC97338VLJ datasheet(27/221 Pages) NSC

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DTR1

DTR2

Group 7

Data Terminal Ready signals 1 and 2. When low, these UART

output signals indicate to the appropriate modem or data transfer

device that the UART is ready to establish a communications link.

The DTR signal can be set to active low by programming bit 0

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

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

state. Loop mode operation holds this signal to its inactive state.

DTR2 is multiplexed with A12

(and BOUT2 in PC97338 only).

ERR

Group 3

Error. This parallel port input signal is set low by the external printer

when it has detected an error.

This pin is internally connected to a nominal 25 K

Ω pull-up resistor.

ERR is multiplexed with HDSEL. See Table 72 for more information.

HDSEL

(Normal

Mode)

Group 10

Head Select. This FDC output signal determines which side of the

FDD is accessed. Active (low) selects side 1, inactive (high) selects

side 0.

(PPM

Mode)

Group 10

Head Select. This signal provides an additional head select signal in

PPM mode when PNF = 0. HDSEL is multiplexed with ERR. See

Table 72 for more information.

ID2

ID1

ID0

43 or

41 or

Group 1

Identification – These ID signals identify the infrared transceiver for Plug

and Play support. These pins are read after reset. These pins are available

only in PC97338.

ID2 is multiplexed with

MTR1, IDLE and IRSL2 or with DRV2, PNF,

DR23, SIRQI3 and IRSL2.

ID1 is multiplexed with IRSL1.

ID0 is multiplexed with

DSR2, IRQ12, IRRX2 and IRSL0.

IDLE

Group 10

Idle. This FDC output pin is used for an IDLE output signal when bit

4 of PMC is 1. It is used for MTR1 when bit 4 of PMC is 0. IDLE

indicates that the FDC is in the Idle state and can be powered

down. Whenever the FDC is in the Idle state, or whenever the FDC

is in a power-down state, the pin is active high.

IDLE is multiplexed with MTR1 and IRSL2.

INDEX

(Normal

Mode)

Group 4

Index. This input signal indicates the beginning of an FDD track.

(PPM

Mode)

Group 4

FDC Index. This signal provides an additional index signal in PPM

mode when PNF = 0.INDEX is multiplexed with PD0. See Table 72

for more information.

INIT

Group 11

Parallel Port Initialize. When this signal is low, it causes the printer

to be initialized. This signal is in a TRI-STATE condition 10 nsec

after a 1 is loaded into the corresponding Control Register bit. The

system should pull this pin high using a 4.7 K

Ω resistor.

INIT is multiplexed with DIR.

IOCHRDY

Group 13

I/O Channel Ready. This is the I/O Channel Ready open-drain

output signal. When IOCHRDY is driven low, the EPP extends the

host cycle.

Symbol

PQFP

TQFP

I/O and

Group #

Function

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