STA308A13TR STMicroelectronics, STA308A13TR Datasheet - Page 55

• Manufacturer Part Number: STA308A13TR
• Description: IC AUDIO PROCESSOR DGTL 64-TQFP
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Processorr

Specifications of STA308A13TR

• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Applications: Digital Audio
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

STA308A
7.5
7.6
Writing a single coefficient to RAM
1.
2.
3.
4.
5.
6.
Writing a set of coefficients to RAM
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. write middle 8-bits of coefficient a1 in I
11. write bottom 8-bits of coefficient a1 in I
12. write top 8-bits of coefficient a2 in I
13. write middle 8-bits of coefficient a2 in I
14. write bottom 8-bits of coefficient a2 in I
15. write top 8-bits of coefficient b0 in I
16. write middle 8-bits of coefficient b0 in I
17. write bottom 8-bits of coefficient b0 in I
18. write 1 to WA bit in I
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 10-bit address would specify the address of the biquad b1
coefficient (for example, decimals 0, 5, 10, 15, …, 100, … 395), and the STA308A will
generate the RAM addresses as offsets from this base value to write the complete set of
coefficient data.
write top 2-bits of address to I
write bottom 8-bits of address to I
write top 8-bits of coefficient in I
write middle 8-bits of coefficient in I
write bottom 8-bits of coefficient in I
write 1 to W1 bit in I
write top 2-bits of starting address to I
write bottom 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
2
2
C address 0x4C
C address 0x4C
2
C register 0x3B
2
C address 0x3D
2
C register 0x3C
2
2
2
2
2
2
2
C address 0x3D
C address 0x40
C address 0x43
C address 0x46
C address 0x49
C address 0x3E
C address 0x3F
2
2
2
2
2
2
2
2
2
2
2
C register 0x3B
C address 0x3E
C address 0x41
C address 0x44
C address 0x47
C address 0x4A
C address 0x3F
C address 0x42
C address 0x45
C address 0x48
C address 0x4B
2
C register 0x3C
Registers
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