ADSP-2115BPZ-100 Datasheet, PDF (33/64 Pages) Analog Devices – ADSP-2100 Family DSP Microcomputers

ADSP-21xx
TIMING PARAMETERS (ADSP-2101/2105/2111/2115/2161/2163)
MEMORY READ
Parameter
Timing Requirement:
t_RDD RD Low to Data Valid
t_AA A0–A13, PMS, DMS, BMS to Data Valid
t_RDH Data Hold from RD High
Switching Characteristic:
t_RP RD Pulse Width
t_CRD CLKOUT High to RD Low
t_ASR A0–A13, PMS, DMS, BMS Setup before
RD Low
t_RDA A0–A13, PMS, DMS, BMS Hold after RD
Deasserted
t_RWR RD High to RD or WR Low
13 MHz 13.824 MHz 16.67 MHz 20 MHz 25 MHz
Min Max Min Max Min Max Min Max Min Max Unit
23.5
37.7
0
0
23.2
36.2
0
17
12
7 ns
27
19.5
12 ns
0
0
ns
33.5
28.2
22
17
12
ns
14.2 29.2 13.1 28.1 10 25 7.5 22.5 5 20 ns
9.2
8.1
5
2.5
1.5¹
ns
10.2
9.1
6
3.5
1
ns
33.5
31.2
25
20
15
ns
Parameter
Frequency Dependency
(CLKIN ≤ 25 MHz)
Min
Timing Requirement:
t_RDD RD Low to Data Valid
t_AA A0–A13, PMS, DMS, BMS to Data Valid
t_RDH Data Hold from RD High
Switching Characteristic:
t_RP RD Pulse Width
t_CRD CLKOUT High to RD Low
t_ASR A0–A13, PMS, DMS, BMS Setup before
RD Low
t_RDA A0–A13, PMS, DMS, BMS Hold after RD
Deasserted
t_RWR RD High to RD or WR Low
0
0.5t_CK – 8 + w
0.25t_CK – 5
0.25t_CK – 10¹
0.25t_CK – 9
0.5t_CK – 5
NOTES
1_{For 25 MHz only minimum frequency dependency formula for tASR = (0.25tCK – 8.5).}
w = wait states × t_CK.
CLKOUT
Max
0.5t_CK – 13 + w
0.75t_CK – 18 + w
0.25t_CK + 10
A0 – A13
DMS, PMS
BMS
RD
D
WR
t_ASR
t_RP
t_CRD
t_RDD
t_AA
t_RDA
t_RWR
t_RDH
Figure 32. Memory Read
REV. B
–33–
Unit
ns
ns
ns
ns
ns
ns
ns