GP2021 datasheet(52/62 Pages) MITEL

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GP2021

Timing Parameter Description

Symbol

Min

Max

Units

Notes

ALE_IP High to WREN and NCS Low setup time

alHwcL

5ns

ALE_IP High to ALE_IP Low pulse width

alHalL

ALE_IP Low to WREN or NCS High pulse width

alLwcH

WREN and NCS Low to WREN or NCS High pulse width

wcLwcH

WREN or NCS High to ALE_IP High hold–off time

wcHalH

5ns

Address Valid to ALE_IP Low setup time

adValL

9ns

ALE_IP Low to Address Invalid hold time

alLadI

8ns

Data Valid to WREN or NCS High setup time

daVwcH

7ns

WREN or NCS High to Data Invalid hold time

wcHdaI

5ns

Note:

Write inhibited until ALE_IP falling edge.

The ALE_IP Low to Data Output Valid Delay assumes ALE_IP is overlapping the READ and NCS Low time.

If not, the

alLda

V parameter applies from the point at which both READ and NCS are Low.

3. The Data Out Propagation delay is for a data bus load of 50pF.

WREN

NCS

READ

ALE_IP

A<9:2>

alHalL

adValL

alLadI

ADDRESS

VALID

alLdaV

rcHdaZ

rcHalH

D<15:0>

(HIGH)

alHrcL

Fig. 33 : Intel 486 mode read (NARMSYS = 1, NINTELMOT = 0, WRPROG = 1)

GP2021 Datasheet(PDF) 52 Page - Mitel Networks Corporation

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