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Music Shield User Manual
2.
Usage Descriptions
2.1. VS1053B
The Music Shield features a VS1053 audio decoder-and-encoder chip designed by VLSI from
Finland, of which internal structure is shown in the following figure:
Control interface: the VS1053 communicates with a MCU through SPI, of which can be controlled
by 7 data lines. They are:
XRSET
Active low asynchronous reset, schmitt-trigger input
XCS
Chip select input (active low)
XDCS
Data chip select (active low)
SI
Serial input
SO
Serial output
SCK
Clock for serial bus
DREQ
Data request, input bus. If DREQ is high, VS1053b can take at least 32 bytes of SDI
data or one SCI command. DREQ is turned low when the stream buffer is too full
and for the duration of a SCI command. At this point sending data or commands
should be stopped.
Revision 1.1. Date: December 7, 2015. Author: W. L. Yan. Editor: Felix.
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