參數(shù)資料
型號(hào): ADSP-2141LKS-N1
廠商: ANALOG DEVICES INC
元件分類(lèi): 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(yè)數(shù): 24/39頁(yè)
文件大?。?/td> 257K
代理商: ADSP-2141LKS-N1
REV. 0
ADSP-2141L
–24–
Parameter
Min
Max
Unit
External Memory Read—ADSP-2141L DMA Initiated
Timing Requirements:
t
RDD
Read Low to Data Valid
t
AA
Address,
DMSx
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 and
DMSx
Active
t
ASR
Address,
DMSx
Setup Before Read Low
t
AH
Address and
DMSx
Hold After Clock
t
RDA
Address,
DMSx
Hold After Read High
t
CRD
Clock High to
RD
Low
t
RP
Read Pulsewidth
t
RWR
RD
High to Read or Write Low
0.5t
CK
– 8 + w
0.5t
CK
– 3 + w
ns
ns
ns
ns
4
1
5
2
2
0.5t
CK
– 7
8
0.5t
CK
– 5 + w
0.5t
CK
– 3
9
ns
ns
ns
ns
ns
ns
ns
12
1. If wait-state(s) added, then referenced to last wait-state clock interval.
2. w = DMA wait states
×
t
CK
.
25ns (REF @ 40MHz)
t
A
t
AA
t
RDD
DSP CLOCK
OUT
EXT. ADDR
(A25–0)
EXT.
DMSH
EXT.
DMSL
EXT.
RD
EXT. DATA
(D31–0)
t
AH
t
RDA
t
ASR
t
CRD
t
RP
t
SUR
t
RDH
t
RWR
Figure 14. External Memory Read – ADSP-2141L DMA Initiated
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