Analog Devices ADSP-2181, ADSP-2183 - page 23

ADSP-2181/ADSP-2183
REV. 0 –23–
ADSP-2181
Parameter Min Max Unit
Memory Read
Timing Requirements:
t
RDD
RD Low to Data Valid 0.5t
CK
– 9 + w ns
t
AA
A0-A13, xMS to Data Valid 0.75t
CK
– 10.5 + w ns
t
RDH
Data Hold from RD High 0 ns
Switching Characteristics:
t
RP
RD Pulse Width 0.5t
CK
– 5 + w n s
t
CRD
CLKOUT High to RD Low 0.25t
CK
– 5 0.25t
CK
+ 7 ns
t
ASR
A0-A13, xMS Setup before RD Low 0.25t
CK
– 6 ns
t
RDA
A0-A13, xMS Hold after RD Deasserted 0.25t
CK
– 3 ns
t
RWR
RD High to RD or WR Low 0.5t
CK
– 5 ns
ADSP-2183
28.8 MHz
Parameter Min Max Unit
Memory Read
Timing Requirements:
t
RDD
RD Low to Data Valid 0.5t
CK
– 9 + w ns
t
AA
A0-A13, xMS to Data Valid 0.75t
CK
– 12.5 + w ns
t
RDH
Data Hold from RD High 0 ns
Switching Characteristics:
t
RP
RD Pulse Width 0.5t
CK
– 5 + w n s
t
CRD
CLKOUT High to RD Low 0.25t
CK
– 5 0.25t
CK
+ 7 ns
t
ASR
A0-A13, xMS Setup before RD Low 0.25t
CK
– 6 ns
t
RDA
A0-A13, xMS Hold after RD Deasserted 0.25t
CK
– 3 ns
t
RWR
RD High to RD or WR Low 0.5t
CK
– 5 ns
w = wait states x t
CK
xMS = PMS, DMS, CMS, IOMS, BMS
CLKOUT
A0 – A13
D
t
RDA
t
RWR
t
RP
t
ASR
t
CRD
t
RDD
t
AA
t
RDH
DMS, PMS,
BMS, IOMS,
CMS
RD
WR
Figure 25. Memory Read