ADSP-21990BST Analog Devices Inc, ADSP-21990BST Datasheet - Page 37

• 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

Serial Peripheral Interface Port—Master Timing
Table 13
Table 13. Serial Peripheral Interface (SPI) Port—Master Timing
Parameter
Timing Requirements
t
t
Switching Characteristics
t
t
t
t
t
t
t
t
SSPID
HSPID
SDSCIM
SPICHM
SPICLM
SPICLK
HDSM
SPITDM
DDSPID
HDSPID
and
CPHA = 1
CPHA = 0
Figure 16
(CPOL = 1)
(CPOL = 0)
(OUTPUT)
(OUTPUT)
(OUTPUT)
(OUTPUT)
(OUTPUT)
(INPUT)
Data Input Valid to SCLK Edge (Data Input Setup)
SCLK Sampling Edge to Data Input Invalid (Data In Hold)
SPISEL Low to First SCLK Edge
Serial Clock High Period
Serial Clock Low Period
Serial Clock Period
Last SCLK Edge to SPISEL High
Sequential Transfer Delay
SCLK Edge to Data Output Valid (Data Out Delay)
SCLK Edge to Data Output Invalid (Data Out Hold)
SPISEL
(INPUT)
SCLK
SCLK
MISO
MISO
MOSI
MOSI
describe SPI port master operations.
t
SSPID
t
SDSCIM
t
SPICLM
t
VALID
SSPID
MSB
t
Figure 16. Serial Peripheral Interface (SPI) Port—Master Timing
SPICHM
MSB
VALID
MSB
t
HSPID
t
SPICLM
t
MSB
DDSPID
Rev. A | Page 37 of 50 | August 2007
t
HSPID
t
DDSPID
t
SPICHM
t
HDSPID
VALID
t
t
LSB
SPICLK
SSPID
t
HDSPID
VALID
LSB
LSB
Min
8
1
2t
2t
2t
4t
2t
2t
0
0
HCLK
HCLK
HCLK
HCLK
HCLK
HCLK
t
HDSM
– 3
– 3
– 3
– 1
– 3
– 2
LSB
t
HSPID
t
SPITDM
Max
6
5
ADSP-21990
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns