MT90221 Zarlink Semiconductor, MT90221 Datasheet - Page 100

• Manufacturer Part Number: MT90221
• Description: Quad Inverse Multiplexing For Atm (IMA) Device With Flexible Ima And Uni Mode
• Manufacturer: Zarlink Semiconductor

AC Electrical Characteristics - External Memory Interface Timing - Write Access
Note: The SR_WE signal stays LOW until a READ cycle is to be performed
System Clock
t
t
t
t
t
t
t
t
t
t
CLK
WC
AVWS
AVWH
CSWS
CSWH
WEWS
WEWH
WDS
WDH
Item
SR_A[18:0]
SR_D[7:0]
SR_WE
SR_CS
System Clock Period
Write Cycle Time
Address Setup Time
Address Hold Time
Chip Select Setup Time
Chip Select Hold Time
Write Enable* Setup Time
Write Enable* Hold Time
Data Setup Time
Data Hold Time
Figure 31 - External Memory Interface Timing - Write Cycle
Description
t
t
avws
wds
t
wews
Address Valid
t
Data Valid
csws
t
3 ns
3 ns
9 ns
3 ns
3 ns
clk
Min
38
t
wc
t
cswh
40 ns
30 ns
Typ
t
wdh
MT90221
1 t
t
avwh
t
CLK
wewh
13 ns
Max
9 ns
9 ns
46
-10 ns
91