參數(shù)資料
型號: ADSP-21267
廠商: Analog Devices, Inc.
英文描述: Preliminary Technical Data
中文描述: 初步技術(shù)數(shù)據(jù)
文件頁數(shù): 29/44頁
文件大小: 454K
代理商: ADSP-21267
ADSP-21267
Rev. PrA
|
Page 29 of 44
|
January 2004
PRELIMINARY TECHNICAL DATA
Table 24. Serial Ports—Enable and Three-State
Parameter
Switching Characteristics
t
DDTEN
t
DDTTE
t
DDTIN
Min
Max
Unit
Data Enable from External Transmit SCLK
1
Data Disable from External Transmit SCLK
1
Data Enable from Internal Transmit SCLK
1
2
ns
ns
ns
7
-1
1
Referenced to drive edge.
Table 25. Serial Ports—External Late Frame Sync
Parameter
Switching Characteristics
t
DDTLFSE
Min
Max
Unit
Data Delay from Late External Transmit FS or External Receive FS
with MCE = 1, MFD = 0
1
Data Enable for MCE = 1, MFD = 0
1
7
ns
ns
t
DDTENFS
0.5
1
The t
DDTLFSE
and t
DDTENFS
parameters apply to Left-justified Sample Pair as well as DSP serial mode, and MCE = 1, MFD = 0.
Figure 21. External Late Frame Sync
1
1
This figure reflects changes made to support Left-justified Sample Pair mode.
DRIVE
SAMPLE
DRIVE
DIA_P[20:0]
(SCLK)
DIA_P[20:0]
(FS)
DIA_P[20:0]
(DXA/DXB)
DRIVE
SAMPLE
DRIVE
LATE EXTERNAL TRANSMIT FS
EXTERNAL RECEIVE FS WITH MCE = 1, MFD = 0
1ST BIT
2ND BIT
DIA_P[20:0]
(SCLK)
DIA_P[20:0]
(FS)
1ST BIT
2ND BIT
t
HFSE/I
t
SFSE/I
t
DDTE/I
t
DDTENFS
t
DDTLFSE
t
HDTE/I
t
HFSE/I
t
SFSE/I
t
DDTE/I
t
DDTENFS
t
DDTLFSE
t
HDTE/I
DIA_P[20:0]
(DXA/DXB)
NOTE
SERIAL PORT SIGNALS (SCLK, FS, DXA,/DXB) ARE ROUTED TO THE DAI_P[20:1] PINS USING THE SRU.
THE TIMING SPECIFICATIONS PROVIDED HERE ARE VALID AT THE DAI_P[20:1] PINS.
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