ADSP-21xx
REV.
–33–
Frequency Dependency
(CLKIN ≤ 25 MHz)
Parameter Min Max Unit
Timing Requirement:
t
RDD
RD Low to Data Valid 0.5t
CK
– 13 + w ns
t
AA
A0–A13, PMS, DMS, BMS to Data Valid 0.75t
CK
– 18 + w ns
t
RDH
Data Hold from RD High 0
Switching Characteristic:
t
RP
RD Pulse Width 0.5t
CK
– 8 + w ns
t
CRD
CLKOUT High to RD Low 0.25t
CK
– 5 0.25t
CK
+ 10 ns
t
ASR
A0–A13, PMS, DMS, BMS Setup before
RD Low 0.25t
CK
– 10
1
ns
t
RDA
A0–A13, PMS, DMS, BMS Hold after RD
Deasserted 0.25t
CK
– 9 ns
t
RWR
RD High to RD or WR Low 0.5t
CK
– 5 ns
NOTES
1
For 25 MHz only minimum frequency dependency formula for t
ASR
= (0.25t
CK
– 8.5).
w = wait states × t
CK.
TIMING PARAMETERS (ADSP-2101/2105/2111/2115/2161/2163)
MEMORY READ
Figure 32. Memory Read
CLKOUT
A0 – A13
D
t
RDA
RD
WR
DMS, PMS
BMS
t
RWR
t
RP
t
ASR
t
CRD
t
RDD
t
AA
t
RDH
13 MHz 13.824 MHz 16.67 MHz 20 MHz 25 MHz
Parameter Min Max Min Max Min Max Min Max Min Max Unit
Timing Requirement:
t
RDD
RD Low to Data Valid 23.5 23.2 17 12 7 ns
t
AA
A0–A13, PMS, DMS, BMS to Data Valid 37.7 36.2 27 19.5 12 ns
t
RDH
Data Hold from RD High 0 0 0 0 0 ns
Switching Characteristic:
t
RP
RD Pulse Width 33.5 28.2 22 17 12 ns
t
CRD
CLKOUT High to RD Low 14.2 29.2 13.1 28.1 10 25 7.5 22.5 5 20 ns
t
ASR
A0–A13, PMS, DMS, BMS Setup before 9.2 8.1 5 2.5 1.5
1
ns
RD Low
t
RDA
A0–A13, PMS, DMS, BMS Hold after RD 10.2 9.1 6 3.5 1 ns
Deasserted
t
RWR
RD High to RD or WR Low 33.5 31.2 25 20 15 ns
