GP2021 datasheet(59/62 Pages) MITEL

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GP2021

Timing Parameter Description

Symbol

Min

Max

Units

Notes

WREN or NCS Inactive to WREN and NCS active

wcIwcA

WREN and NCS Active to WREN or NCS inactive

wcAwcI

ALE_IP High to WREN and NCS Active pulse width

alHwcA

WREN and NCS Active to ALE_IP Low hold time

wcAalL

1, 2

Address Valid to WREN and NCS Active setup time

adVwcA

9ns

WREN and NCS Active to Address Invalid hold time

wcAadI

READ Valid to WREN and NCS Active setup time

dVwcA

1, 3

WREN and NCS Active to READ Invalid hold time

wcArdI

1, 3

DATA Valid to WREN or NCS Inactive setup time

daVwcI

7ns

WREN or NCS Inactive to DATA Invalid hold time

wcIdaI

5ns

Notes:

WREN is active High, NCS is Active Low.

If ALE_IP does not overlap WREN and NCS active by wcAalL then the timings for ALE_IP both

overlapping and non–overlapping WREN and NCS active must be met.

READ is transparently latched by WREN and NCS being active.

There is no parameter specified for WREN or NCS Inactive to ALE_IP High, since the internal ALE signal is

disabled until after the end of the internal Read or Write Strobe; hence the need for the wcIalL parameter.

WREN

NCS

READ

ALE_IP

A<9:2>

D<15:0>

DATA

VALID

wcIwcA

rdVwcA

wcArdI

alHwcA

adVwcA

wcAadI

daVwcI

wcIdaI

ADDRESS

VALID

wcAalL

wcAwcI

Fig. 40 : Motorola mode read, ALE_IP overlapping WREN and NCS (NARMSYS = 1, NINTELMOT = 1, WRPROG = X)

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