adsp-21371kswz-2a Analog Devices, Inc., adsp-21371kswz-2a Datasheet - Page 42

• Manufacturer Part Number: adsp-21371kswz-2a
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21371/ADSP-21375
SPI Interface—Slave
Table 40. SPI Interface Protocol—Slave Switching and Timing Specifications
Parameter
Timing Requirements
t
t
t
t
t
t
t
t
Switching Characteristics
t
t
t
t
t
SPICLKS
SPICHS
SPICLS
SDSCO
HDS
SSPIDS
HSPIDS
SDPPW
DSOE
DSDHI
DDSPIDS
HDSPIDS
DSOV
CPHASE = 1
CPHASE = 0
(OUTPUT)
(OUTPUT)
SPICLK
(CP = 0)
(INPUT)
SPICLK
(CP = 1)
(INPUT)
MISO
MISO
(INPUT)
(INPUT)
(INPUT)
SPIDS
MOSI
MOSI
Serial Clock Cycle
Serial Clock High Period
Serial Clock Low Period
SPIDS Assertion to First SPICLK Edge
CPHASE = 0
CPHASE = 1
Last SPICLK Edge to SPIDS Not Asserted, CPHASE=0
Data Input Valid to SPICLK edge (Data Input Set-up Time)
SPICLK Last Sampling Edge to Data Input Not Valid
SPIDS Deassertion Pulse Width (CPHASE=0)
SPIDS Assertion to Data Out Active
SPIDS Deassertion to Data High Impedance
SPICLK Edge to Data Out Valid (Data Out Delay Time)
SPICLK Edge to Data Out Not Valid (Data Out Hold Time)
SPIDS Assertion to Data Out Valid (CPHASE = 0)
t
S D S C O
t
t
D S O E
D S O V
t
t
S P IC H S
S S P I D S
MSB
t
t
D D S P I D S
MSB VALID
S P I C L S
MSB VALID
MSB
Rev. B | Page 42 of 52 | June 2008
t
D D S P I D S
Figure 30. SPI Slave Timing
t
t
S P I C H S
S P I C L S
t
S S P I D S
t
D D S P I D S
LSB VALID
t
t
S P I C L K S
S S P I D S
t
H D S P I D S
LSB
LSB VALID
t
H S P I D S
1.2 V, 266 MHz
Min
4 × t
2 × t
2 × t
2 × t
2 × t
2 × t
2
2
2 × t
0
0
2 × t
t
t
H S P I D S
H D S
LSB
PCLK
PCLK
PCLK
PCLK
PCLK
PCLK
PCLK
PCLK
– 2
– 2
– 2
t
Max
6.8
6.8
9.5
5 × t
S D P P W
t
t
t
D S D H I
H D S P I D S
D S D H I
PCLK
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns