sta381bws STMicroelectronics, sta381bws Datasheet - Page 82

• Manufacturer Part Number: sta381bws
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

Register description: New Map
82/168
Writing a set of coefficients to RAM
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Write bottom 8 bits of coefficient a1 in I
11. Write top 8 bits of coefficient a2 in I
12. Write middle 8 bits of coefficient a2 in I
13. Write bottom 8 bits of coefficient a2 in I
14. Write top 8 bits of coefficient b0 in I
15. Write middle 8 bits of coefficient b0 in I
16. Write bottom 8 bits of coefficient b0 in I
17. 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 6-bit address specifies the
address of the biquad b1 coefficient (for example, 0, 5, 10, 20, 35 decimal), and the
STA381BWS generates the RAM addresses as offsets from this base value to write the
complete set of coefficient data.
Write 6 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
2
C address 0x37.
Doc ID 018937 Rev 2
2
2
2
2
2
2
C register 0x27.
C address 0x28.
C address 0x2B.
C address 0x2E.
C address 0x31.
C address 0x34.
2
2
2
2
2
2
2
2
2
2
C address 0x29.
C address 0x2C.
C address 0x2F.
C address 0x32.
C address 0x35.
C address 0x2A.
C address 0x2D.
C address 0x30.
C address 0x33.
C address 0x36.
STA381BWS