PSD913F2 datasheet(14/94 Pages) STMICROELECTRONICS

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PSD9XX Family

Preliminary Information

The following table describes the pin names and pin functions of the PSD9XX. Pins that

have multiple names and/or functions are defined using PSDsoft.

7.0

Table 5.

PSD9XX

Descriptions

Pin Name

Pin* Type

Description

(PLCC)

ADIO0-7

30-37

I/O

This is the lower Address/Data port. Connect your MCU

address or address/data bus according to the following rules:

1. If your MCU has a multiplexed address/data bus where

the data is multiplexed with the lower address bits,

connect AD[0:7] to this port.

2. If your MCU does not have a multiplexed address/data

bus, or you are using an 80C251 in page mode, connect

A[0:7] to this port.

3. If you are using an 80C51XA in burst mode, connect

A4/D0 through A11/D7 to this port.

ALE or AS latches the address. The PSD drives data out only

if the read signal is active and one of the PSD functional

blocks was selected. The addresses on this port are passed

to the PLDs.

ADIO8-15

39-46

I/O

This is the upper Address/Data port. Connect your MCU

address or address/data bus according to the following rules:

1. If your MCU has a multiplexed address/data bus where

the data is multiplexed with the lower address bits,

connect A[8:15] to this port.

2. If your MCU does not have a multiplexed address/data

bus, connect A[8:15] to this port.

3. If you are using an 80C251 in page mode, connect

AD[8:15] to this port.

4. If you are using an 80C51XA in burst mode, connect

A12/D8 through A19/D15 to this port.

ALE or AS latches the address. The PSD drives data out only

if the read signal is active and one of the PSD functional

blocks was selected. The addresses on this port are passed

to the PLDs.

CNTL0

The following control signals can be connected to this port,

based on your MCU:

1. WR — active-low write input.

2. R_W — active-high read/active low write input.

This pin is connected to the PLDs. Therefore, these signals

can be used in decode and other logic equations.

CNTL1

The following control signals can be connected to this port,

based on your MCU:

1. RD — active-low read input.

2. E — E clock input.

3. DS — active-low data strobe input.

4. PSEN — connect PSEN to this port when it is being used

as an active-low read signal. For example, when the

80C251 outputs more than 16 address bits, PSEN is

actually the read signal.

This pin is connected to the PLDs. Therefore, these

signals can be used in decode and other logic equations.

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