VS1011 Datasheet, PDF (20/43 Pages) List of Unclassifed Manufacturers – MP3 AUDIO CODEC

VLSI
Solution ^y
VS1011 PRELIMINARY
VS1011
7. SPI BUSES
XCS
SCK
tXCSS
0
1
tWL tWH
14
15
16
tXCSH
30
31
tXCS
SI
SO
tZ
tH
tSU
tV
tDIS
Figure 7: SPI Timing Diagram.
7.6 SPI Examples with SM SDINEW and SM SDISHARED set
7.6.1 Two SCI Writes
SCI Write 1
SCI Write 2
XCS
0
1
2
3
SCK
SI
0
0
0
0
30 31
10
X
32 33
0
0
61 62 63
2
1
0
X
Figure 8: Two SCI Operations.
Figure 8 shows two consecutive SCI operations. Note that xCS must be raised to inactive state between
the writes.
7.6.2 Two SDI Bytes
SDI data is synchronized with a raising edge of xCS as shown in Figure 9. However, every byte doesn’t
need separate synchronization.
7.6.3 SCI Operation in Middle of Two SDI Bytes
Figure 10 shows how an SCI operation is embedded in between SDI operations. The changes in xCS are
used to synchronize both SDI and SCI.
Version 0.71, 2004-07-20
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