ADSP-21367/ADSP-21368/ADSP-21369
Rev. D
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Page 37 of 56
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November 2008
Parallel Data Acquisition Port (PDAP)
The timing requirements for the PDAP are provided in
. 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-21368 SHARC Processor Hardware
Reference
. Note that the most significant 16 bits of external
PDAP data can be provided through the DATA31–16 pins. The
remaining four bits can only be sourced through DAI_P4–1.
The timing below is valid at the DATA31–16 pins.
Table 34. Parallel Data Acquisition Port (PDAP)
Parameter
Min
Max
Unit
Timing Requirements
t
SPCLKEN
1
PDAP_CLKEN Setup Before PDAP_CLK Sample Edge
2.5
ns
t
HPCLKEN
1
PDAP_CLKEN Hold After PDAP_CLK Sample Edge
2.5
ns
t
PDSD
1
PDAP_DAT Setup Before SCLK PDAP_CLK Sample Edge
3.85
ns
t
PDHD
1
PDAP_DAT Hold After SCLK PDAP_CLK Sample Edge
2.5
ns
t
PDCLKW
Clock Width
(t
CCLK
× 8) ÷ 2 – 3
ns
t
PDCLK
Clock Period
t
CCLK
× 8
ns
Switching Characteristics
t
PDHLDD
Delay of PDAP Strobe After Last PDAP_CLK Capture Edge for a Word
2 × t
PCLK
+ 3
ns
t
PDSTRB
PDAP Strobe Pulse Width
2 × t
PCLK
– 1
ns
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.
Figure 25. PDAP Timing
DAI_P20
-
1
(PDAP_CLK)
S
AMPLE EDGE
t
PD
S
D
t
PDHD
t
S
PCLKEN
t
HPCLKEN
t
PDCLKW
DATA
DAI_P20
-
1
(PDAP_CLKEN)
t
PD
S
TRB
t
PDHLDD
DAI_P20
-
1
(PDAP_
S
TROBE)
t
PDCLK