ADSP-2181
P aram eter
Min
Max
Unit
Mem or y Read
Timing Requirements:
tRDD
tAA
tRDH
RD Low to Data Valid
A0–A13, xMS to Data Valid
Data Hold from RD High
0.5tCK – 9 + w
0.75tCK – 10.5 + w
ns
ns
ns
0
Switching Characteristics:
tRP
RD Pulsewidth
CLKOUT High to RD Low
A0–A13, xMS Setup before RD Low
A0–A13, xMS Hold after RD Deasserted
RD High to RD or WR Low
0.5tCK – 5 + w
0.25tCK – 5
0.25tCK – 4
0.25tCK – 3
0.5tCK – 5
ns
ns
ns
ns
ns
tCRD
tASR
tRDA
tRWR
0.25tCK + 7
w = wait states × tCK
.
xMS = PMS, DMS, CMS, IOMS, BMS.
CLKOUT
A0–A13
DMS, PMS,
BMS, IOMS,
CMS
tRDA
RD
D
tASR
tCRD
tRP
tRWR
tRDD
tRDH
tAA
WR
Figure 11. Mem ory Read
REV. D
–17–
ADI [ ADI ]
