Datasheet

93
XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
37.1.16 EBI characteristics
Table 37-31. EBI SRAM characteristics and requirements.
Symbol Parameter Condition Min. Typ. Max. Units
t
ClkPER2
SRAM clock period 0.5*t
ClkPER
t
ALH
SRAM address hold after ALE low t
ClkPER2
t
ALS
SRAM address setup before ALE low (read and write) t
ClkPER2
t
ALW
SRAM ALE width t
ClkPER2
t
ARH
SRAM address hold after RE high t
ClkPER2
t
ARS
SRAM address setup before RE high t
ClkPER2
t
AWH
SRAM address hold after WE high t
ClkPER2
t
AWS
SRAM Address setup before WE high t
ClkPER2
t
DRH
SRAM data hold after RE high 0
t
DRS
SRAM data setup to RE high 3.0V 12
t
DRS
SRAM data setup to RE high 2.7V, 85C 17
ns
t
DRS
SRAM data setup to RE high 1.6V, 85C 27
t
DWH
SRAM data hold after WE high t
ClkPER2
t
DWS
SRAM data setup to WE high t
ClkPER2
t
RW
SRAM read enable pulse width t
ClkPER2
*S
RWS
t
WW
SRAM write enable pulse width t
ClkPER2
*S
RWS
t
CH
SRAM chip select hold after RE/WE high t
ClkPER2
t
CRS
SRAM chip select setup to RE low or ALE high 0
t
CWS
SRAM chip select setup to WE low (no ALE) t
ClkPER2