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參數資料
型號: ADSP-21266
廠商: Analog Devices, Inc.
英文描述: SHARC Embedded Processor
中文描述: SHARC處理器嵌入式處理器
文件頁數: 33/44頁
文件大小: 426K
代理商: ADSP-21266
ADSP-21266
Rev. B
|
Page 33 of 44
|
May 2005
Parallel Data Acquisition Port (PDAP)
The timing requirements for the PDAP are provided in
Table 29
and
Figure 24
. PDAP is the parallel mode operation of
Channel 0 of the IDP. For details on the operation of the IDP,
see the IDP chapter of the
ADSP-2126x Peripherals Manual
.
Note that the most significant 16 bits of external PDAP data can
be provided through either the parallel port AD15
0 or the
DAI_P20
5 pins. The remaining four bits can only be sourced
through DAI_P4
1. The timing below is valid at the
DAI_P20
1 pins or at the AD15
0 pins.
Table 29. Parallel Data Acquisition Port (PDAP)
Parameter
Timing Requirements
t
SPCLKEN
t
HPCLKEN
t
PDSD
t
PDHD
t
PDCLKW
t
PDCLK
Min
Max
Unit
PDAP_CLKEN Setup Before PDAP_CLK Sample Edge
1
PDAP_CLKEN Hold After PDAP_CLK Sample Edge
1
PDAP_DAT Setup Before SCLK PDAP_CLK Sample Edge
1
PDAP_DAT Hold After SCLK PDAP_CLK Sample Edge
1
Clock Width
Clock Period
2.5
2.5
2.5
2.5
7
20
ns
ns
ns
ns
ns
ns
Switching Characteristics
t
PDHLDD
t
PDSTRB
1
Source pins of DATA are ADDR7
0, DATA7
0, or DAI pins. Source pins for SCLK and FS are: 1) DAI pins, 2) CLKIN through PCG, or 3) DAI pins through PCG.
Delay of PDAP Strobe After Last PDAP_CLK Capture Edge for a Word
PDAP Strobe Pulse Width
2 × t
CCLK
1 × t
CCLK
– 1
ns
ns
Figure 24. Parallel Data Acquisition Port (PDAP)
DAI_P20–1
(PDAP_CLK)
SAMPLE EDGE
t
PDSD
t
PDHD
t
SPCLKEN
t
HPCLKEN
t
PDCLKW
DATA
DAI_P20–1
(PDAP_CLKEN)
t
PDSTRB
t
PDHLDD
DAI_P20–1
(PDAP_STROBE)
t
PDCLK
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