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ADSP-21367/ADSP-21368/ADSP-21369
Rev. D
|
Page 43 of 56
|
November 2008
SPI Interface—Master
The processors contain two SPI ports. The primary has dedi-
cated pins and the secondary is available through the DPI. The
timing provided in
and
to both.
Table 41. SPI Interface Protocol—Master Switching and Timing Specifications
Parameter
Min
Max Unit
Timing Requirements
t
SSPIDM
Data Input Valid to SPICLK Edge (Data Input Setup Time)
8.2
ns
t
HSPIDM
SPICLK Last Sampling Edge to Data Input Not Valid
2
ns
Switching Characteristics
t
SPICLKM
Serial Clock Cycle
8 × t
PCLK
– 2
ns
t
SPICHM
Serial Clock High Period
4 × t
PCLK
– 2
ns
t
SPICLM
Serial Clock Low Period
4 × t
PCLK
– 2
ns
t
DDSPIDM
SPICLK Edge to Data Out Valid (Data Out Delay Time)
2.5
ns
t
HDSPIDM
SPICLK Edge to Data Out Not Valid (Data Out Hold Time)
4 × t
PCLK
– 2
ns
t
SDSCIM
FLAG3–0IN (SPI Device Select) Low to First SPICLK Edge
4 × t
PCLK
– 2
ns
t
HDSM
Last SPICLK Edge to FLAG3–0IN High
4 × t
PCLK
– 2
ns
t
SPITDM
Sequential Transfer Delay
4 × t
PCLK
– 1
ns
Figure 34. SPI Master Timing
L
S
B
VALID
M
S
B
VALID
t
SS
PI DM
t
H
S
PI DM
t
HD
S
PIDM
L
S
B
M
S
B
t
H
S
PI DM
t
D D
S
P I DM
MO
S
I
(OUTPUT)
MI
S
O
(INPUT)
FLAG
3
-
0
(OUTPUT)
S
PICLK
(CP = 0)
(OUTPUT)
S
PICLK
(CP = 1)
(OUTPUT)
t
HD
S
PI DM
L
S
B
VALID
L
S
B
M
S
B
M
S
B
VALID
t
H
S
PI DM
t
DD
S
PI DM
MO
S
I
(OUTPUT)
MI
S
O
(INPUT)
t
SS
PI DM
CPHA
S
E = 1
CPHA
S
E = 0
t
S
PI CHM
t
S
PI CL M
t
S
PI CL M
t
S
PI CL KM
t
S
PI CHM
t
HD
S
M
t
S
PI T DM
t
S
D
S
CI M
t
SS
PI DM