GP2021 Datasheet, PDF (52/62 Pages) Mitel Networks Corporation – GPS 12 channel Correlator Advance Information

GP2021
READ
NCS
ALE_IP
A<9:2>
D<15:0>
WREN
(HIGH)
alHalL
alHrcL
adValL
alLadI
ADDRESS
VALID
alLdaV
rcHalH
rcHdaZ
Fig. 33 : Intel 486 mode read (NARMSYS = 1, NINTELMOT = 0, WRPROG = 1)
Timing Parameter Description
Symbol
Min
ALE_IP High to WREN and NCS Low setup time
τ_alHwcL
5
ALE_IP High to ALE_IP Low pulse width
τ_alHalL
13
ALE_IP Low to WREN or NCS High pulse width
τ_alLwcH
10
WREN and NCS Low to WREN or NCS High pulse width
τ_wcLwcH
10
WREN or NCS High to ALE_IP High hold–off time
τ_wcHalH
5
Address Valid to ALE_IP Low setup time
τ_adValL
9
ALE_IP Low to Address Invalid hold time
τ_alLadI
8
Data Valid to WREN or NCS High setup time
τ_daVwcH
7
WREN or NCS High to Data Invalid hold time
τ_wcHdaI
5
Max
Units Notes
ns
ns
ns
1
ns
ns
ns
ns
ns
ns
Note:
1 Write inhibited until ALE_IP falling edge.
2 The ALE_IP Low to Data Output Valid Delay assumes ALE_IP is overlapping the READ and NCS Low time.
If not, the τ_alLdaV 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.
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