參數(shù)資料
型號(hào): ADSP-2141LKS-N1
廠商: ANALOG DEVICES INC
元件分類: 加密電路
英文描述: DSP
中文描述: TELECOM, DATA ENCRYPTION CIRCUIT, PQFP208
封裝: METRIC, PLASTIC, QFP-208
文件頁數(shù): 26/39頁
文件大?。?/td> 257K
代理商: ADSP-2141LKS-N1
REV. 0
ADSP-2141L
–26–
Parameter
Min
Max
Unit
External Memory Read—ADSP-2141L DSP Initiated
Timing Requirements:
t
RDD
Read Low to Data Valid
t
AA
Address,
xMS
Valid to Data Valid
t
SUR
Data Valid Before Read Deasserted
t
RDH
Data Hold After Read Deasserted
Switching Characteristics:
t
A
Clock to Address,
xMS
Active
t
ASR
Address,
xMS
Setup Before Read Low
t
AH
Address,
xMS
Hold After Clock
t
RDA
Address,
xMS
Hold After Read High
t
CRD
Clock High to
RD
Low
t
RP
Read Pulsewidth
t
RWR
RD High to
RD
or
WR
Low
0.5t
CK
– 10 + w
0.75t
CK
– 11.5 + w
ns
ns
ns
ns
9
0
1
0.25t
CK
– 4
1
0.25t
CK
– 3
0.25t
CK
– 2
0.5t
CK
– 5 + w
0.5t
CK
–5
6
ns
ns
ns
ns
ns
ns
ns
0.25t
CK
+ 7
1. If wait-state(s) added, then referenced to last wait-state clock interval.
2. w = DSP wait state
×
t
CK
.
DSP CLOCK
OUT
EXT. ADDR
(A13–0)
EXT. RD
EXT. DATA
(D23–0)
t
AA
25ns (REF @ 40MHz)
t
RDA
t
CRD
t
AH
t
ASR
PMS
,
DMSx
,
BMS
,
IOMS
,
CMS
t
A
t
RP
t
SUR
t
RDD
t
RDH
t
RWR
Figure 16. External Memory Read – ADSP-2141L DSP Initiated
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