GP2021 Datasheet, PDF (59/62 Pages) Mitel Networks Corporation – GPS 12 channel Correlator Advance Information

GP2021
WREN
NCS
READ
ALE_IP
A<9:2>
D<15:0>
wcIwcA
wcAwcI
rdVwcA
wcArdI
alHwcA
wcAalL
adVwcA
wcAadI
ADDRESS
VALID
daVwcI
wcIdaI
DATA
VALID
Fig. 40 : Motorola mode read, ALE_IP overlapping WREN and NCS (NARMSYS = 1, NINTELMOT = 1, WRPROG = X)
Timing Parameter Description
WREN or NCS Inactive to WREN and NCS active
WREN and NCS Active to WREN or NCS inactive
ALE_IP High to WREN and NCS Active pulse width
WREN and NCS Active to ALE_IP Low hold time
Address Valid to WREN and NCS Active setup time
WREN and NCS Active to Address Invalid hold time
READ Valid to WREN and NCS Active setup time
WREN and NCS Active to READ Invalid hold time
DATA Valid to WREN or NCS Inactive setup time
WREN or NCS Inactive to DATA Invalid hold time
Symbol
τ_wcIwcA
τ_wcAwcI
τ_alHwcA
τ_wcAalL
τ_adVwcA
τ_wcAadI
τ_dVwcA
τ_wcArdI
τ_daVwcI
τ_wcIdaI
Min
Max
23
10
13
6
9
11
7
5
7
5
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes
1
1
1
1, 2
1
1
1, 3
1, 3
1
1
Notes: 1
2
3
4
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.
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