STA32813TR STMicroelectronics, STA32813TR Datasheet - Page 51

• Manufacturer Part Number: STA32813TR
• Description: IC DAS 2.1CH HI EFF POWERSO36
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Ampr

Specifications of STA32813TR

• Mounting Type: Surface Mount
• Package / Case: 36-PowerSOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Other names: 497-8876-2

STA328
7.10
Writing a set of coefficients to RAM
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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.
0
1
2
3
4
5
…
19
20
21
…
39
Index (decimal)
write 8 bits of starting address to I
write top 8 bits of coefficient b1 in I
write middle 8 bits of coefficient b1 in I
write bottom 8 bits of coefficient b1 in I
write top 8 bits of coefficient b2 in I
write middle 8 bits of coefficient b2 in I
write bottom 8 bits of coefficient b2 in I
write top 8 bits of coefficient a1 in I
write middle 8 bits of coefficient a1 in I
write bottom 8 bits of coefficient a1 in I
write top 8 bits of coefficient a2 in I
write middle 8 bits of coefficient a2 in I
write bottom 8 bits of coefficient a2 in I
write top 8 bits of coefficient b0 in I
write middle 8 bits of coefficient b0 in I
write bottom 8 bits of coefficient b0 in I
write 1 to WA bit in I
RAM block for biquads, mixing, and scaling
0x00
0x01
0x02
0x03
0x04
0x05
…
0x13
0x14
0x15
…
0x27
Index (Hex)
2
C address 0x26
Channel 1 - Biquad 1
Channel 1 - Biquad 2
…
Channel 1 - Biquad 4
Channel 2 - Biquad 1
…
Channel 2 - Biquad 4
2
2
2
2
2
2
C register 0x16
C address 0x17
C address 0x1A
C address 0x1D
C address 0x20
C address 0x23
2
2
2
2
2
2
2
2
2
2
C address 0x18
C address 0x1B
C address 0x1E
C address 0x21
C address 0x24
C address 0x19
C address 0x1C
C address 0x1F
C address 0x22
C address 0x25
User programmable processing
C1H10 (b1/2)
C1H11 (b2)
C1H12 (a1/2)
C1H13 (a2)
C1H14 (b0/2)
C1H20
…
C1H44
C2H10
C2H11
…
C2H44
Coefficient
0x000000
0x000000
0x000000
0x000000
0x400000
0x000000
…
0x400000
0x000000
0x000000
…
0x400000
Default
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