ADSP-21990BST Analog Devices Inc, ADSP-21990BST Datasheet - Page 38

• Manufacturer Part Number: ADSP-21990BST
• Description: IC DSP CONTROLLER 16BIT 176LQFP
• Manufacturer: Analog Devices Inc
• Series: ADSP-21xxr
• Type: Fixed Pointr

Specifications of ADSP-21990BST

• Rohs Status: RoHS non-compliant
• Interface: SPI, SSP
• Clock Rate: 160MHz
• Non-volatile Memory: External
• On-chip Ram: 20kB
• Voltage - I/o: 3.30V
• Voltage - Core: 2.50V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 176-LQFP

ADSP-21990
Serial Peripheral Interface Port—Slave Timing
Table 14
Table 14. Serial Peripheral Interface (SPI) Port—Slave Timing
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)
(INPUT)
Figure 17
(INPUT)
(INPUT)
(INPUT)
(INPUT)
SPISS
SCLK
SCLK
MOSI
MOSI
MISO
MISO
Serial Clock High Period
Serial Clock Low Period
Serial Clock Period
Last SPICLK Edge to SPISS Not Asserted
Sequential Transfer Delay
SPISS Assertion to First SPICLK Edge
Data Input Valid to SCLK Edge (Data Input Setup)
SCLK Sampling Edge to Data Input Invalid (Data In Hold)
SPISS Assertion to Data Out Active
SPISS Deassertion to Data High Impedance
SCLK Edge to Data Out Valid (Data Out Delay)
SCLK Edge to Data Out Invalid (Data Out Hold)
t
t
DSOE
DSOE
describe SPI port slave operations.
t
SDSCI
t
t
SPICHS
SPICLS
t
SSPID
t
VALID
DDSPID
MSB
MSB
VALID
t
MSB
Figure 17. Serial Peripheral Interface (SPI) Port—Slave Timing
DDSPID
MSB
t
HDSPID
t
HSPID
Rev. A | Page 38 of 50 | August 2007
t
t
SPICHS
SPICLS
t
SSPID
t
DDSPID
VALID
LSB
t
t
SPICLK
SSPID
LSB
VALID
LSB
t
HSPID
Min
2t
2t
4t
2t
2t
2t
1.6
2.4
0
0
0
0
HCLK
HCLK
HCLK
HCLK
HCLK
HCLK
t
t
t
HDS
DSDHI
DSDHI
LSB
t
HSPID
+ 4
t
SPITDS
Max
8
10
10
10
ns
ns
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns