Rev. A
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Page 57 of 72
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September 2011
Shift Register
Table 53. Shift Register
Parameter
Min
Max
Unit
Timing Requirements
tSSDI
SR_SDI Setup Before SR_SCLK Rising Edge
7
ns
tHSDI
SR_SDI Hold After SR_SCLK Rising Edge
2
ns
tSSDIDAI
1
DAI_P08–01 (SR_SDI) Setup Before DAI_P08–01 (SR_SCLK) Rising Edge
7
ns
DAI_P08–01 (SR_SDI) Hold After DAI_P08–01 (SR_SCLK) Rising Edge
2
ns
tSSCK2LCK
2
SR_SCLK to SR_LAT Setup
2
ns
DAI_P08–01 (SR_SCLK) to DAI_P08–01 (SR_LAT) Setup
2
ns
tCLRREM2SCK
Removal Time SR_CLR to SR_SDCLK
3 × tPCLK – 5
ns
tCLRREM2LCK
Removal Time SR_CLR to SR_LAT
2 × tPCLK – 5
ns
tCLRW
SR_CLR Pulse Width
4 × tPCLK – 5
ns
tSCKW
SR_SDCLK Clock Pulse Width
2 × tPCLK – 2
ns
tLCKW
SR_LAT Clock Pulse Width
2 × tPCLK – 5
ns
fMAX
Maximum Clock Frequency SR_SDCLK or SR_LAT
fCCLK
÷ 8MHz
Switching Characteristics
ns
tDSDO1
3
SR_SDO Hold After SR_SCLK Rising Edge
3
ns
tDSDO2
SR_SDO Max. Delay After SR_SCLK Rising Edge
13
ns
SR_SDO Hold After DAI_P08–01 (SR_SCLK) Rising Edge
3
ns
SR_SDO Max. Delay After DAI_P08–01 (SR_SCLK) Rising Edge
13
ns
SR_SDO Hold After DAI_P20–01 (SR_SCLK) Rising Edge
–2
ns
SR_SDO Max. Delay After DAI_P20–01 (SR_SCLK) Rising Edge
5
ns
SR_SDO Hold After DAI_P20–01 (SR_SCLK) Rising Edge
–2
ns
SR_SDO Max. Delay After DAI_P20–01 (SR_SCLK) Rising Edge
5
ns
SR_CLR to SR_SDO Min. Delay
4
ns
SR_CLR to SR_SDO Max. Delay
13
ns
SR_LDO Hold After SR_LAT Rising Edge
3
ns
SR_LDO Max. Delay After SR_LAT Rising Edge
13
ns
SR_LDO Hold After DAI_P08–01 (SR_LAT) Rising Edge
3
ns
SR_LDO Max. Delay After DAI_P08–01 (SR_LAT) Rising Edge
13
ns
SR_LDO Hold After DAI_P20–01 (SR_LAT) Rising Edge
–2
ns
SR_LDO Max. Delay After DAI_P20–01 (SR_LAT) Rising Edge
5
ns
SR_LDO Hold After DAI_P20–01 (SR_LAT) Rising Edge
–2
ns
SR_LDO Max. Delay After DAI_P20–01 (SR_LAT) Rising Edge
5
ns
tDLDOCLR1
SR_CLR to SR_LDO Min. Delay
4
ns
tDLDOCLR2
SR_CLR to SR_LDO Max. Delay
14
ns
1 Any of the DAI_P08-01 pins can be routed to the shift register clock, latch clock and serial data input via the SRU.
2 Both clocks can be connected to the same clock source. If both clocks are connected to same clock source, then data in the 18-stage shift register is always one cycle ahead of
latch register data.
3 For setup/hold timing requirements of off-chip shift register interfacing devices.
4 SPORTx serial clock out, frame sync out, and serial data outputs are routed to shift register block internally and are also routed onto DAI_P20–01.
5 PCG serial clock output is routed to SPORT and shift register block internally and are also routed onto DAI_P20–01. The SPORTs generate SR_LAT and SDI internally.
6 PCG Serial clock and frame sync outputs are routed to SPORT and shift register block internally and are also routed onto DAI_P20–01. The SPORTs generate SDI internally.