ADSP-2104_15 Datasheet, PDF (31/36 Pages) Analog Devices – Low Cost DSP Microcomputers

TIMING PARAMETERS (ADSP-2104L/ADSP-2109L)
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
w = wait states × t_CK.
13.824 MHz
Min Max
23.2
36.2
0
28.2
13.1 28.1
8.1
9.1
31.2
ADSP-2104/ADSP-2109
Frequency
Dependency
Min
Max
Unit
0.5t_CK – 13 + w ns
0.75t_CK – 18 + w ns
0
ns
0.5t_CK – 8 + w
ns
0.25t_CK – 5 0.25t_CK + 10
ns
0.25t_CK – 10
ns
0.25t_CK – 9
ns
0.5t_CK – 5
ns
CLKOUT
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 28. Memory Read
REV. 0
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