Data Sheet

PRELIMINARY

VS1063a Datasheet

10 OPERATION

10.7.2 The Encoding Procedure

The encoding procedure from start to ﬁnish goes as follows:

1. Pre-initialization; Setup system:

• Load the VS1063a Patches package, available at

http://www.vlsi.ﬁ/en/support/software/vs10xxplugins.html . Note that the package is

required for conforming MP3 bitstreams: without it recording quality will be signiﬁ-

cantly lower and the bitstream may have errors.

2. Initialization; Set samplerate and parameters:

• SCI_AICTRL0 for samplerate (SCI_WRAMADDR for bitrate/quality setting)

• SCI_AICTRL1 for gain/AGC

• SCI_AICTRL2 for AGC max gain

• SCI_AICTRL3 for channel selection, encoding format and options

• If used, ﬁll in UART conﬁguration.

• If used, ﬁll in Ogg Vorbis serial number.

• SCI_WRAMADDR to set bitrate/quality (mp3 and Ogg Vorbis only)

• Activate encoding with one of the two ways:

– Recommended: If you use the VS1063a Patches package, start encoding as

follows: set bit SM_ENCODE in SCI_MODE, then write 0x50 to AIADDR.

– If you do not use the VS1063a Patches package, start encoding mode by setting

SM_ENCODE and SM_SOFTRESET in register SCI_MODE.

3. Recording:

• Depending on whether you selected SCI or UART data transfers with bit 13 of

SCI_AICTRL3, read data through SCI_HDAT0/SCI_HDAT1 as described in Chap-

ter 10.7.3, or through the UART.

4. Finalizing recording:

• When you want to ﬁnish encoding a ﬁle, set bit SM_CANCEL in SCI_MODE.

• After a while (typically less than 100 ms), SM_CANCEL will clear.

• If using SCI for data transfers, read all remaining words using SCI_HDAT1/SCI_HDAT0.

Then read parametric_x.endFillByte. If the most signiﬁcant bit (bit 15) is set to 1, then

the ﬁle is of an odd length and bits 7:0 contain the last byte that still should be written

to the output ﬁle. Now write 0 to endFillByte.

• When all samples have been transmitted, SM_ENCODE bit of SCI_MODE will be

cleared by VS1063a, and SCI_HDAT1 and SCI_HDAT0 are cleared.

5. Now you can give a software reset to enter player mode or start encoding again.

Version: 0.42, 2011-11-24 57