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參數資料
型號: ADSP-21020BG-100
廠商: ANALOG DEVICES INC
元件分類: 數字信號處理
英文描述: 32/40-Bit IEEE Floating-Point DSP Microprocessor
中文描述: 48-BIT, 25 MHz, OTHER DSP, CPGA223
封裝: CERAMIC, PGA-223
文件頁數: 17/32頁
文件大小: 425K
代理商: ADSP-21020BG-100
ADSP-21020
REV. C
–17–
External Memory Three-State Control
K/B/T Grade
K/B/T Grade
B/T Grade
K Grade
20 MHz
Min
25 MHz
Min
30 MHz
Min Max Min Max Min
33.3 MHz Frequency Dependency*
Parameter
Max
Max
Max
Unit
Timing Requirement:
t
STS
xTS
, Setup before CLKIN High
t
DADTS
xTS
Delay after Address, Select
t
DSTS
xTS
Delay after
XRD
,
XWR
Low
14
50
28
16
12
40
19
11
10
33
13
7
9
30
10
6
14 + DT/4 t
CK
ns
ns
ns
28 + 7DT/8
16 + DT/2
Switching Characteristic:
t
DTSD
Memory Interface Disable before
CLKIN High
t
DTSAE
xTS
High to Address, Select Enable
0
0
–2
0
–4
0
–5
0
DT/4
ns
ns
NOTES
*DT = t
CK
– 50 ns.
xTS
should only be asserted (low) during an active memory access cycle.
Memory Interface = PMA23-0, PMD47-0,
PMS1-0
,
PMRD
,
PMWR
, PMPAGE, DMA31-0, DMD39-0,
DMS3-0
,
DMRD
,
DMWR
, DMPAGE.
Address = PMA23-0, DMA31-0. Select =
PMS1-0
,
DMS3-0
.
x = PM or DM.
CLKIN
ADDRESS,
SELECTS
t
STS
DATA
t
DTSD
t
DADTS
t
DTSAE
t
DSTS
t
STS
xRD, xWR
PMTS, DMTS
Figure 9. External Memory Three-State Control
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相關代理商/技術參數
參數描述
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