ADSP-21991BST Analog Devices Inc, ADSP-21991BST Datasheet - Page 33

• Manufacturer Part Number: ADSP-21991BST
• Description: IC DSP CONTROLLER 16BIT 176LQFP
• Manufacturer: Analog Devices Inc
• Series: ADSP-21xxr
• Type: Fixed Pointr

Specifications of ADSP-21991BST

• Rohs Status: RoHS non-compliant
• Interface: SPI, SSP
• Clock Rate: 160MHz
• Non-volatile Memory: External
• On-chip Ram: 112kB
• Voltage - I/o: 3.30V
• Voltage - Core: 2.50V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 176-LQFP

Serial Peripheral Interface Port—Slave Timing
Table 13
Table 13. Serial Peripheral Interface (SPI) Port—Slave Timing
REV. 0
Parameter
Timing Requirements
t
t
t
t
t
t
t
t
Switching Characteristics
t
t
t
t
SPICHS
SPICLS
SPICLK
HDS
SPITDS
SDSCI
SSPID
HSPID
DSOE
DSDHI
DDSPID
HDSPID
and
CPHA = 1
CPHA = 0
(CPOL = 1)
(CPOL = 0)
(OUTPUT)
(OUTPUT)
Figure 16
(INPUT)
(INPUT)
(INPUT)
(INPUT)
(INPUT)
SPISS
SCLK
Serial Clock High Period
Serial Clock Low Period
Serial Clock Period
Last SPICLK Edge to SPISS Not Asserted
Sequential Transfer Delay
Data Input Valid to SCLK Edge (Data Input Setup)
SCLK Sampling Edge to Data Input Invalid (Data In Hold)
SCLK Edge to Data Out Valid (Data Out Delay)
SCLK Edge to Data Out Invalid (Data Out Hold)
SCLK
SPISS Assertion to First SPICLK Edge
SPISS Assertion to Data Out Active
SPISS Deassertion to Data High Impedance
MOSI
MOSI
MISO
MISO
t
t
DSOE
DSOE
describe SPI port slave operations.
t
SDSCI
t
t
SPICHS
SPICLS
Figure 16. Serial Peripheral Interface (SPI) Port—Slave Timing
t
SSPID
t
VALID
DDSPID
MSB
MSB
VALID
t
MSB
DDSPID
MSB
t
HDSPID
t
HSPID
t
t
SPICHS
SPICLS
–33–
t
SSPID
t
DDSPID
VALID
LSB
t
t
SPICLK
SSPID
LSB
VALID
LSB
t
Min
2t
2t
4t
2t
2t
2t
1.6
2.4
0
0
0
0
HSPID
HCLK
HCLK
HCLK
HCLK
HCLK
HCLK
t
t
t
HDS
DSDHI
DSDHI
LSB
+4
t
HSPID
t
SPITDS
ADSP-21991
Max
8
10
10
10
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns