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VS1103b Datasheet

FUNCTIONAL DESCRIPTION

6.6.9

SCI_IN0 and SCI_IN1 (R)

SCI_IN0 and SCI_IN1 are used for offering SCI stream data and for reading encoded ADPCM

Stream 4 data.

The bits in the registers are as follows:

R/W

Bits/

Description

SCI_IN0

Read

15:0

Read one word from Stream 4

SCI_IN0

Write

15:0

Write one word to SCI sourced stream

SCI_IN1

Read

15:8

Number of words ×8 that can be read from SCI_IN0 (Stream 4)

SCI_IN1

Read

7:0

Number of words ×8 that can be written to SCI_IN0 (SCI sourced stream)

Note: Data word length is 16 bits.

Example: If reading SCI_IN1 returns 0x0312, then 0x03×8 words = 24 words = 48 bytes can

be read from SCI_IN0 and 0x12×8 words = 144 words = 288 bytes can be written to SCI_IN0.

6.6.10

SCI_AIADDR (RW)

SCI_AIADDR indicates the start address of the application code written earlier with SCI_WRAMADDR

and SCI_WRAM registers. If no application code is used, this register should not be initialized,

or it should be initialized to zero. For more details, see Application Notes for VS10XX.

6.6.11

SCI_VOL (RW)

SCI_VOL is a volume control for the player hardware. The most signiﬁcant byte of the volume

channel volume sets the attenuation from the maximum volume level in 0.5 dB steps. Maximum

volume is 0x0000 and total silence but with the output drivers on is 0xFEFE. Setting SCI_VOL

to 0xFFFF will activate analog powerdown mode.

SCI_VOL bits

Name

Bits

Description

SVOL_LEFT

15:8

Left channel attenuation from maximum in 1/2 dB steps

SVOL_RIGHT

7:0

Right channel attenuation from maximum in 1/2 dB steps

Example: for a volume of -2.0 dB for the left channel and -3.5 dB for the right channel: (2.0/0.5)

= 4, 3.5/0.5 = 7 → SCI_VOL = 0x0407.

Example: SCI_VOL = 0x2424 → both left and right volumes are 0x24 * -0.5 = -18.0 dB.

Note: After hardware reset the volume is set to full volume. Resetting the software does not

reset the volume setting.

Version: 1.04, 2018-03-16

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