GP2021 datasheet(57/62 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 ALE_IP Low pulse width

alHalL

WREN or NCS Inactive to ALE_IP Low Hold off time

wcIalL

Address Valid to ALE_IP Low setup time

adValL

9ns

ALE_IP Low to Address Invalid hold time

alLadI

8ns

READ Valid to WREN and NCS Active setup time

rdVwcA

1, 2

WREN and NCS Active to READ Invalid hold time

wcArdI

1, 2

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.

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

wcIalL

alHalL

adValL

alLadI

daVwcI

wcIdaI

wcAwcI

ADDRESS

VALID

Fig. 38 : Motorola mode write, ALE_IP non-overlapping WREN and NCS (NARMSYS = 1, NINTELMOT = 1, WRPROG = X)

GP2021 Datasheet(PDF) 57 Page - Mitel Networks Corporation

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