Analog Devices ADSP-2181 Manual page 23

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