ADSP-BF531 / ADSP-BF532 / ADSP-BF533
Serial Port Timing
Table 28 through Table 31 on Page 37 and Figure 23 on Page 35
through Figure 26 on Page 37 describe Serial Port operations.
Table 28. Serial Ports—External Clock
V DDEXT = 1.8 V
V DDEXT = 2.5 V/3.3 V
Parameter
Timing Requirements
Min Max
Min Max Unit
t SFSE
t HFSE
t SDRE
t HDRE
TFSx/RFSx Setup Before TSCLKx/RSCLKx 1
TFSx/RFSx Hold After TSCLKx/RSCLKx 1
Receive Data Setup Before RSCLKx 1
Receive Data Hold After RSCLKx 1
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
ns
ns
ns
ns
t SCLKEW TSCLKx/RSCLKx Width
8.0
4.5
ns
t SCLKE
t SUDTE
TSCLKx/RSCLKx Period
Start-Up Delay From SPORT Enable To First External TFSx 3
20.0
4.0 × t SCLKE
15.0 2
4.0 × t SCLKE
ns
ns
t SUDRE Start-Up Delay From SPORT Enable To First External RFSx 3
4.0 × t SCLKE
4.0 × t SCLKE
ns
Switching Characteristics
t DFSE
TFSx/RFSx Delay After TSCLKx/RSCLKx (Internally Generated TFSx/RFSx) 4
10.0
10.0
ns
t HOFSE TFSx/RFSx Hold After TSCLKx/RSCLKx (Internally Generated TFSx/RFSx) 1
0.0
0.0
ns
t DDTE
t HDTE
Transmit Data Delay After TSCLKx 1
Transmit Data Hold After TSCLKx 1
0.0
10.0
0.0
10.0
ns
ns
1
2
3
4
Referenced to sample edge.
For receive mode with external RSCLKx and external RFSx only, the maximum specification is 11.11 ns (90 MHz).
Verified in design but untested. After being enabled, the serial port requires external clock pulses—before the first external frame sync edge—to initialize the serial port.
Referenced to drive edge.
Table 29. Serial Ports—Internal Clock
V DDEXT = 1.8 V
V DDEXT = 2.5 V/3.3 V
Parameter
Min
Max
Min Max Unit
Timing Requirements
t SFSI
t HFSI
t SDRI
t HDRI
TFSx/RFSx Setup Before TSCLKx/RSCLKx 1
TFSx/RFSx Hold After TSCLKx/RSCLKx 1
Receive Data Setup Before RSCLKx 1
Receive Data Hold After RSCLKx 1
11.0
? 2.0
9.5
0.0
9.0
? 2.0
9.0
0.0
ns
ns
ns
ns
Switching Characteristics
t DFSI
TFSx/RFSx Delay After TSCLKx/RSCLKx (Internally Generated TFSx/RFSx) 2
3.0
3.0
ns
t HOFSI TFSx/RFSx Hold After TSCLKx/RSCLKx (Internally Generated TFSx/RFSx) 1
? 1.0
? 1.0
ns
t DDTI
t HDTI
Transmit Data Delay After TSCLKx 1
Transmit Data Hold After TSCLKx 1
? 2.5
3.0
? 2.0
3.0
ns
ns
t SCLKIW TSCLKx/RSCLKx Width
1
Referenced to sample edge.
2
Referenced to drive edge.
6.0
4.5
ns
Rev. I
|
Page 34 of 64 |
August 2013
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