參數(shù)資料
型號: DSP1620
英文描述: TVS 400W 6.0V BIDIRECT SMA
中文描述: 澄清,串行I /設(shè)備的DSP1620/27/28/29 O控制注冊說明
文件頁數(shù): 95/114頁
文件大?。?/td> 804K
代理商: DSP1620
Preliminary Data Sheet
February 1997
DSP1628 Digital Signal Processor
93
Lucent Technologies Inc.
10 Timing Characteristics for 2.7 V Operation
(continued)
10.7 External Memory Interface
The following timing diagrams, characteristics, and requirements do not apply to interactions with delayed external
memory enables unless so stated. See the DSP1611/17/18/27 Digital Signal Processor Information Manualfor a
detailed description of the external memory interface including other functional diagrams.
* W = number of wait-states.
Figure 18. Enable Transition Timing
Table 78. Timing Characteristics for External Memory Enables (EROM, ERAMHI, IO, ERAMLO)
Abbreviated Reference
t33
t34
Parameter
Min
0
–1
Max
5
4.5
Unit
ns
ns
CKO to ENABLE Active (low to low)
CKO to ENABLE Inactive (low to high)
Table 79. Timing Characteristics for Delayed External Memory Enables (ioc = 0x000F)
Abbreviated Reference
t33
Parameter
Min
T/2
Max
T/2 + 7
Unit
ns
CKO to Delayed ENABLE Active (low to low)
CKO
ENABLE
t34
t33
W* = 0
V
OH
V
OL
V
OH
V
OL
5-4020 (C).b
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