ADSP-2166_15 Datasheet, PDF (26/39 Pages) Analog Devices – DSP Microcomputers with ROM

ADSP-216x
TIMING PARAMETERS (ADSP-2161/ADSP-2163/ADSP-2165)
MEMORY WRITE
Parameter
16.67 MHz
Min Max
Switching Characteristics:
t_DW
t_DH
t_WP
t_WDE
t_ASW
t_DDR
t_CWR
t_AW
t_WRA
t_WWR
Data Setup Before WR High
Data Hold After WR High
WR Pulsewidth
WR Low to Data Enabled
A0–A13, DMS, PMS Setup Before WR Low
Data Disable Before WR or RD Low
CLKOUT High to WR Low
A0–A13, DMS, PMS, Setup Before WR Deasserted
A0–A13, DMS, PMS Hold After WR Deasserted
WR High to RD or WR Low
17
5
22
0
5
5
10
25
23
6
25
20 MHz
Min Max
12
2.5
17
0
2.5
2.5
7.5 22.5
15.5
3.5
20
25 MHz
Min Max Unit
7
ns
0
ns
12
ns
0
ns
1.5¹
ns
1.5¹
ns
5
20 ns
8
ns
1
ns
15
ns
Parameter
Frequency Dependency
(CLKIN ≤ 25 MHz)
Min
Max
Switching Characteristics:
t_DW
t_DH
t_WP
t_WDE
t_ASW
t_DDR
t_CWR
t_AW
t_WRA
t_WWR
Data Setup Before WR High
Data Hold After WR High
WR Pulsewidth
WR Low to Data Enabled
A0–A13, DMS, PMS Setup Before WR Low
Data Disable Before WR or RD Low
CLKOUT High to WR Low
A0–A13, DMS, PMS, Setup Before WR Deasserted
A0–A13, DMS, PMS Hold After WR Deasserted
WR High to RD or WR Low
0.5t_CK – 13 + w
0.25t_CK – 10
0.5t_CK – 8 + w
0
0.25t_CK – 10¹
0.25t_CK – 10¹
0.25t_CK – 5
0.75t_CK – 22 + w
0.25t_CK – 9
0.5t_CK – 5
NOTES
1_{For 25 MHz only, the minimum frequency dependency formula for t ASW and tDDR = (0.25tCK – 8.5).}
w = wait states × t_CK.
0.25t_CK + 10
CLKOUT
A0–A13
DMS, PMS,
BMS
WR
D
RD
t_WRA
t_ASW
t_CWR
t_WP
t_AW
t_DW
t_WDE
t_WWR
t_DH
t_DDR
Figure 25. Memory Write
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
–26–
REV. 0