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BIT1612 10-Bit Digital Video Decoder with OSD and T-CON

6.24 Scaling Engine

BIT1612 可分別針對垂直 (Vertical) 和水平 (Horizontal) 方向做 Scaling 處理，其相關設定及說明如下：

Horizontal

Scaling UP

Non-Linear

/ Linear

Data

Input

Data

Output

Position

Position Position

Scale-

Rate

Scale-

Rate

Scale-

Rate

Linear

Mode

Three-Step

Mode

Non-Linear

Mode

Vertical

Linear

Scaling

UP/Down

Horizontal

Scaling

Down

Buffer

800

Figure 6-21 Scaling Function

6.24.1 Horizontal Scaling Down Engine

BIT1612 可針對水平方向預作縮小處理，以符合Buffer深度。其相關設定請參考 Table 6-25。

Table 6-25 Horizontal Scale Down Register

Mnemonic Address R/W Bits Description Default

R_PRESCX_START

0x05B[7:4],

0x059[7:0]

RW 12 Horizontal Scaling Down Start Value 0x0B5

R_PRESCX_SHIFT

0x05B[2:0],

0x05A[7:0]

RW 11 Horizontal Scaling Down Shift Value 0x16A

R_PRESCX_FIX

0x05C[5:4],

0x05D[7:0]

RW 10 Horizontal Scaling Down Fix Value 0x140

Horizontal Scaling Down Enable

0: Disable (Bypass Mode)

R_PRESCX_EN 0x05C[0] RW 1

1: Enable (Scale Mode)

Horizontal Scaling Down Filter

Enable

0: Disable (Bypass Mode)

R_PRESCX_FILTER_EN 0x05C[1] RW 1

1: Enable (Filter Mode)

Horizontal Scaling Down Filter Type

0: Bi-Linear Filter

R_PRESCX_FILTER 0x05C[2] RW 1

1: Box Filter

Scale Down Factor 2 Enable

0: Disable (Bypass Mode)

R_PRE_FIX2_EN 0x05C[3] RW 1

1: Enable (Scale Down 2 Mode)

Scale Down Factor over 2

0: Disable (Factor under 2)

R_PRESCX_OVER 0x05C[7] RW 1

1: Enable (Factor over 2)

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 114 115

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