STA323W ST Microelectronics, STA323W Datasheet - Page 36

• Manufacturer Part Number: STA323W
• Description: 2.1 High Efficiency Digital Audio System
• Manufacturer: ST Microelectronics

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STA323W
8.10 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 (e.g.
0, 5, 10, 15, …, 45 decimal), and the STA323W will generate the RAM addresses as offsets from this
base value to write the complete set of coefficient data.
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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
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2
C address 26h
2
C register 16h
2
2
2
2
2
C address 17h
C address 1Ah
C address 1Dh
C address 20h
C address 23h
2
2
2
2
2
2
2
2
2
2
C address 18h
C address 1Bh
C address 1Eh
C address 21h
C address 24h
C address 19h
C address 1Ch
C address 1Fh
C address 22h
C address 25h
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