Datasheet

ADSP-BF534/ADSP-BF536/ADSP-BF537
Rev. I|Page 39 of 68 | July 2010
Serial Port Timing
Table 30 through Table 33 on Page 42 and Figure 20 on Page 40
through Figure 23 on Page 42 describe serial port operations.
Table 30. Serial Ports—External Clock
Parameter MinMaxUnit
Timing Requirements
t
SFSE
TFSx/RFSx Setup Before TSCLKx/RSCLKx
1
3.0 ns
t
HFSE
TFSx/RFSx Hold After TSCLKx/RSCLKx
1
3.0 ns
t
SDRE
Receive Data Setup Before RSCLKx
1
3.0 ns
t
SCLKEW
TSCLKx/RSCLKx Width 4.54.5
t
SCLKE
TSCLKx/RSCLKx Period 15.015.0
t
SUDTE
Start-Up Delay From SPORT Enable To First External TFSx
2
4.0 × t
SCLKE
ns
t
SUDRE
Start-Up Delay From SPORT Enable To First External RFSx
2
4.0 × t
SCLKE
ns
Switching Characteristics
t
DFSE
TFSx/RFSx Delay After TSCLKx/RSCLK (Internally Generated TFSx/RFSx)
3
10.0 ns
t
HOFSE
TFSx/RFSx Hold After TSCLKx/RSCLK (Interna lly Generated TFSx/RFSx)
2
0 ns
t
DDTE
Tran smit Data Delay After TSCLKx
2
10.0 ns
t
HDTE
Tran smit Data Hold After TSCLKx
2
0 ns
1
Referenced to sample edge.
2
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.
3
Referenced to drive edge.
Table 31. Serial Ports—Internal Clock
2.25 V ≤ V
DDEXT
< 2.70 V
or
0.80 V ≤ V
DDINT
< 0.95 V
1
2.70 V ≤ V
DDEXT
≤ 3.60 V
and
0.95 V ≤ V
DDINT
≤ 1.43 V
2, 3
Parameter MinMaxMinMaxUnit
Timing Requirements
t
SFSI
TFSx/RFSx Setup Before TSCLKx/RSCLKx
4
8.58.0 ns
t
HFSI
TFSx/RFSx Hold After TSCLKx/RSCLKx
4
–1.5–1.5 ns
t
SDRI
Receive Data Setup Before RSCLKx
4
8.58.0 ns
t
HDRI
Receive Data Hold After RSCLKx
4
–1.5–1.5 ns
Switching Characteristics
t
DFSI
TFSx/RFSx Delay After TSCLKx/RSC LKx (Internally Generated
TFSx/RFSx)
5
3.03.0 ns
t
HOFSI
TFSx/RFSx Hold After TSCLKx/RSCLKx (Internally Generated
TFSx/RFSx)
5
−1.0 −1.0 ns
t
DDTI
Transmit Data Delay After TSCLKx
5
3.03.0 ns
t
HDTI
Transmit Data Hold After TSCLKx
5
−1.0 −1.0 ns
t
SCLKIW
TSCLKx/RSCLKx Width 4.54.5 ns
1
Applies to all nonautomotive-grade devices when operated within either of these voltage ranges.
2
Applies to all nonautomotive-grade devices when operated within these voltage ranges.
3
All automotive-grade devices are within these specifications.
4
Referenced to sample edge.
5
Referenced to drive edge.