STW8009_07 datasheet(39/66 Pages) STMICROELECTRONICS

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Control registers

STw8009/STw8019

38/65

Values from these registers are used only when bit main_flt_s (Reg 72) is set to 1. Bit

main_flt_s has the highest priority over the rest. With main_flt_s bit set to 1, all bits from

main_plg_div[1:0] need to be programmed to the chroma coefficients. Alternatively, the

coefficients default values are loaded depending on the selected mode or the selected filter

type in a particular mode with flt(1:0) bits from register 1.

The values are soft loaded when main_flt_s = 1. The value to be loaded in the register

should be the actual coefficient value + an offset. The hardware will internally subtract this

offset to get the actual coefficient value.

main_flt-s default value: 0

The main_plg_div value is chosen according to the sum of all the coefficients.

Offset change before loading to user register:

REGISTERS 72 to 80

Chroma filter coefficients

Address:

0x0048 to 0x0050

Type: R/W

Table 15.

Chroma main_coef_[8:0]

chroma_main_coef_0

reg_

main_flt_s

main_plg

_div1

main_plg

_div0

coef0(4) coef0(3) coef0(2) coef0(1) coef0(0)

chroma_main_coef_1

reg_

xxx

coef8(8)

coef1(5)

coef1(4) coef1(3) coef1(2) coef1(1) coef1(0)

chroma_main_coef_2

reg_

xxx

coef2(6)

coef2(5)

coef2(4) coef2(3) coef2(2) coef2(1) coef2(0)

chroma_main_coef_3

reg_

xxx

coef3(6)

coef3(5)

coef3(4) coef3(3) coef3(2) coef3(1) coef3(0)

chroma_main_coef_4

reg_

coef4(7)

coef4(6)

coef4(5)

coef4(4) coef4(3) coef4(2) coef4(1) coef4(0)

chroma_main_coef_5

reg_

coef5(7)

coef5(6)

coef5(5)

coef5(4) coef5(3) coef5(2) coef5(1) coef5(0)

chroma_main_coef_6

reg_

coef6(7)

coef6(6)

coef6(5)

coef6(4) coef6(3) coef6(2) coef6(1) coef6(0)

chroma_main_coef_7

reg_

coef7(7)

coef7(6)

coef7(5)

coef7(4) coef7(3) coef7(2) coef7(1) coef7(0)

chroma_main_coef_8

reg_

coef8(7)

coef8(6)

coef8(5)

coef8(4) coef8(3) coef8(2) coef8(1) coef8(0)

main_plg_div = 11 when sum of coeffs = 4096

main_plg_div = 10 when sum of coeffs = 2048

main_plg_div = 01 when sum of coeffs = 1024, (default)

main_plg_div = 00 when sum of coeffs = 512

chroma_main_coef0 = Actual value + 16;

chroma_main_coef1 = Actual value + 32;

chroma_main_coef2 = Actual value + 64;

chroma_main_coef3 = Actual value + 32;

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