PSD211R datasheet(14/51 Pages) STMICROELECTRONICS

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PSD211R Family

Function

PAD A and PAD B Inputs

In CSI mode (when high), PAD deselects all of its outputs and enters a

A19/CSI

power-down mode (see Tables 7A and 7B). In A19 mode, it is another

input to the PAD.

A16–A18

These are general purpose inputs from Port C. See Figure 4, Note 3.

A11–A15

These are address inputs.

RD/E

This is the read pulse or enable strobe input.

WR or R/W

This is the write pulse or R/W select signal.

ALE/AS

This is the ALE or AS input to the chip.

RESET

This deselects all outputs from the PAD; it can not be used in product

term equations. See Tables 8A and 8B.

PAD A Outputs

These are internal chip-selects to the 8 EPROM banks. Each bank can

ES0–ES7

be located on any boundary that is a function of one product term of the

PAD address inputs.

This internal chip-select selects the I/O ports. It can be placed on any

CSIOPORT

boundary that is a function of one product term of the PAD inputs. See

Table 5.

PAD B Outputs

CS0–CS3

These chip-select outputs can be routed through Port B. Each of them is

a function of up to four product terms of the PAD inputs.

CS4 –CS7

These chip-select outputs can be routed through Port B. Each of them is

a function of up to two product terms of the PAD inputs.

CS8–CS10

These chip-select outputs can be routed through Port C. See Figure 4,

Note 3. Each of them is a function of one product term of the PAD inputs.

Table 4. PSD211R PAD A and PAD B Functions

Programmable

Address

Decoder (PAD)

(cont.)

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