STA310 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA310' PDF : 90 Pages View PDF
STA310
Address: 0xBF
Type: R/W
Software Reset: 0x01
Hardware Reset: UND
Description:
This register must contain a NDIV value that enables
the audio PLL to generate a frequency of
ofact*176KHz for the PCMCK.
Default value at soft reset assume:
– Oversampling factor (ofact) = 384. PCMLCK =
384 x SF (where SF is the sampling frequency)
– External crystal provide a clock running at
27MHz
INIT_RAM
STa310 boot Done
7654321
0
RAM_INIT
Address: 0xFF
Type: RO
Software Reset: 1
Hardware Reset: 0
Description:
This register is used to signal when the STA310 has
finished to boot. After a soft reset or a hardware re-
set, the host processor must wait until INIT_RAM
hold the value “1”.
The host can then start to configure the STA310 ac-
cording to its application.
PLLMASK
PCMCLK mask for half sampling frequency
7654321
0
HALF_FS
Address: 0x18
Type: W
Software Reset: NC
Hardware Reset: 0
Bitfield
Description
HALF_FS If the incoming bitstream is encoded with
half sampling frequency, the device
generates a PCM clock (for audio DAC)
1: At 256 x half_fs or 384 x half_fs (half_fs
is equal to 24KHz, 22.05KHz, 16KHz).
0: At 256 x fs or 384 x fs (fs is equal to
48KHz, 44.1KHz, 32KHz).
This function is mainly use for DAC
frequency adaptation.
9.7 Channel delay set-up registers
The six delay setup registers are used to set the rel-
ative delays to the (up to) six loud speaker channels
in order to give the sound effects of, for example, a
large room or to compensate for the listener not being
in the centre of the loud speaker system. The sum of
the delays on the channels must be less than or
equal to 35ms.
The unit for the register delay contents is a group of
16 samples.
Each register value is chosen using the expression:
desired channel delay’*’sampling frequency’/16 sam-
ples and taking care to ensure that the sum of the ’de-
sired channel delays’ is not more than 35ms.
For example, when the sampling frequency is 48kHz,
the sum of the values programmed in the six delay
registers must be less than or equal to:
35 ms * 48 KHz /16 samples = 105.
When only one surround channel is present (in Pro
Logic or other mode), the right surround delay must
be cleared, and the left delay channel is used for both
surround channels.
LDLY
Left channel delay
7
6
5
4
3
2
1
0
Address: 0x57
Type: R/W
Software Reset: NC
Hardware Reset: UND
45/90
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