VS1011E Datasheet, PDF (23/49 Pages) List of Unclassifed Manufacturers – MPEG AUDIO CODEC

VLSI
Solution ^y
VS1011e
VS1011E
7. SPI BUSES
7.7 SPI Examples with SM SDINEW and SM SDISHARED set
7.7.1 Two SCI Writes
SCI Write 1
SCI Write 2
XCS
0
1
2
3
SCK
SI
0
0
0
0
DREQ
30 31
10
X
32 33
61 62 63
0
0
2
1
0
X
DREQ up before finishing next SCI write
Figure 10: Two SCI Operations.
Figure 10 shows two consecutive SCI operations. Note that xCS must be raised to inactive state between
the writes. Also DREQ must be respected as shown in the figure.
7.7.2 Two SDI Bytes
SDI Byte 1
XCS
0
1
2
3
SCK
7
6
5
4
3
SI
67
10
SDI Byte 2
8
9
13 14 15
7
6
5
2
1
0
X
DREQ
Figure 11: Two SDI Bytes.
SDI data is synchronized with a raising edge of xCS as shown in Figure 11. However, every byte doesn’t
need separate synchronization.
Version 1.04, 2007-10-08
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