VS1001K Datasheet, PDF (19/40 Pages) List of Unclassifed Manufacturers – MPEG AUDIO CODEC

VLSI
Solution ^y
DATASHEET
VS1001K
5. SPI BUSES
Word read is shown in Figure 8.
XCS
SCK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
30 31
SI
0 0 0 0 0 0 1 17 6 5 4 3 2 1 0
don’t care
instruction (READ)
address
data out
high impedance
SO
15 14
1 0X
Figure 8: SCI Word Read
5.4.3 SCI Write
VS1001k registers are written by the following sequence. First, XCS line is pulled low to select the
device. Then the WRITE opcode (0x2) is transmitted via the SI line followed by an 8-bit word address.
After the word has been shifted in, XCS should be pulled high to end the WRITE sequence. XCS low to
high transition must occur after SCLK high to low transition corresponding to LSB of the last word.
Single word write is shown in Figure 9.
XCS
SCK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
29 30 31
SI
0 0 0 0 0 0 1 0 7 6 5 4 3 2 1 0 15 14
2 1 0 don’t care
instruction (WRITE)
address
Figure 9: SCI Word Write
data in
Version 4.14, 2004-02-10
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