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STA328 Datasheet(PDF) 51 Page - STMicroelectronics

Part # STA328
Description  2.1-channel high-efficiency digital audio system
PDF  57 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA328 Datasheet(HTML) 51 Page - STMicroelectronics

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STA328
User programmable processing
51/57
7.10
Writing a set of coefficients to RAM
"
write 8 bits of starting address to I2C register 0x16
"
write top 8 bits of coefficient b1 in I2C address 0x17
"
write middle 8 bits of coefficient b1 in I2C address 0x18
"
write bottom 8 bits of coefficient b1 in I2C address 0x19
"
write top 8 bits of coefficient b2 in I2C address 0x1A
"
write middle 8 bits of coefficient b2 in I2C address 0x1B
"
write bottom 8 bits of coefficient b2 in I2C address 0x1C
"
write top 8 bits of coefficient a1 in I2C address 0x1D
"
write middle 8 bits of coefficient a1 in I2C address 0x1E
"
write bottom 8 bits of coefficient a1 in I2C address 0x1F
"
write top 8 bits of coefficient a2 in I2C address 0x20
"
write middle 8 bits of coefficient a2 in I2C address 0x21
"
write bottom 8 bits of coefficient a2 in I2C address 0x22
"
write top 8 bits of coefficient b0 in I2C address 0x23
"
write middle 8 bits of coefficient b0 in I2C address 0x24
"
write bottom 8 bits of coefficient b0 in I2C address 0x25
"
write 1 to WA bit in I2C address 0x26
The mechanism for writing a set of coefficients to RAM provides a method of updating the
five coefficients corresponding to a given biquad (filter) simultaneously to avoid possible
unpleasant acoustic side-effects. When using this technique, the 8-bit address would
specify the address of the biquad b1 coefficient (for example 0, 5, 10, 15, …, 45 decimal),
and the STA328 will generate the RAM addresses as offsets from this base value to write
the complete set of coefficient data.
Table 64.
RAM block for biquads, mixing, and scaling
Index (decimal)
Index (Hex)
Coefficient
Default
0
0x00
Channel 1 - Biquad 1
C1H10 (b1/2)
0x000000
1
0x01
C1H11 (b2)
0x000000
2
0x02
C1H12 (a1/2)
0x000000
3
0x03
C1H13 (a2)
0x000000
4
0x04
C1H14 (b0/2)
0x400000
5
0x05
Channel 1 - Biquad 2
C1H20
0x000000
……
…
…
…
19
0x13
Channel 1 - Biquad 4
C1H44
0x400000
20
0x14
Channel 2 - Biquad 1
C2H10
0x000000
21
0x15
C2H11
0x000000
……
…
…
…
39
0x27
Channel 2 - Biquad 4
C2H44
0x400000



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