STW8019 datasheet(36/55 Pages) STMICROELECTRONICS

36 / 55 page

Control registers

STw8009/STw8019

36/55

Values from these registers are used only when bit flt_ys of register 81 is set to 1.

The coefficient values of luma_coef_0 to luma_coef_7 should be entered as 2’s

complement, and the rest as normal positive values. The hardware will internally generate

normal positive values. Default values:

The FIR filter is symmetrical with the following response:

Working frequency of this filter is the one of pix_clk (27, 24.545454 or 29.5 MHz), and the

filtering is done on upsampled signal (half pix_clk to pix_clk frequency by padding by zeros).

REGISTERS 82 to 91:

luma filter

coefficients

Address:

0x0052 to 0x005B

Type: R/W

Table 16.

Luma_coef_[0:9]

luma_coef_0

reg_82

xxx

l8(8)

l0(4)

l0(3)

l0(2)

l0(1)

l0(0)

luma_coef_1

reg_83

l9(9)

l9(8)

l1(5)

l1(4)

l1(3)

l1(2)

l1(1)

l1(0)

luma_coef_2

reg_84

l6(8)

l2(6)

l2(5)

l2(4)

l2(3)

l2(2)

l2(1)

l2(0)

luma_coef_3

reg_85

l7(8)

l3(6)

l3(5)

l3(4)

l3(3)

l3(2)

l3(1)

l3(0)

luma_coef_4

reg_86

l4(7)

l4(6)

l4(5)

l4(4)

l4(3)

l4(2)

l4(1)

l4(0)

luma_coef_5

reg_87

l5(7)

l5(6)

l5(5)

l5(4)

l5(3)

l5(2)

l5(1)

l5(0)

luma_coef_6

reg_88

l6(7)

l6(6)

l6(5)

l6(4)

l6(3)

l6(2)

l6(1)

l6(0)

luma_coef_7

reg_89

l7(7)

l7(6)

l7(5)

l7(4)

l7(3)

l7(2)

l7(1)

l7(0)

luma_coef_8

reg_90

l8(7)

l8(6)

l8(5)

l8(4)

l8(3)

l8(2)

l8(1)

l8(0)

luma_coef_9

reg_91

l9(7)

l9(6)

l9(5)

l9(4)

l9(3)

l9(2)

l9(1)

l9(0)

a0 = luma_coef_0[4:0] = 00001

means +1;

a1 = luma_coef_1[5:0] = 111111

means -1;

a2 = luma_coef_2[6:0] = 1110111

means -9;

a3 = luma_coef_3[6:0] = 0000011

means +3;

a4 = luma_coef_4[7:0] = 00011111

means +31;

a5 = luma_coef_5[7:0] = 11111011

means -5;

a6 = luma_coef_6[8:0] = 110101100

means -84;

a7 = luma_coef_7[8:0] = 000000111

means +7;

a8 = luma_coef_8[8:0] = 100111101

means +317;

a9 = luma_coef_9[9:0] = 0111111000

means +504;

()

1 z

–

+ 8z

–

8 z

–

+ 2z

–

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