CXD3511 データシートの表示（PDF） - Sony Semiconductor

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CXD3511

Digital Signal Driver/Timing Generator

Sony Semiconductor 

CXD3511Q

(b) Pre gain block

This block performs multiplication processing independently for ports 1 and 2. The settings are as follows.

Coefficient: 8 bits

Gain setting: 0 to 1.9921875 (= 255/128) times, variable in 256 steps

(Set independently for R, G and B ports 1 and 2)

Multiplication is performed using the 8-bit input and an 8-bit coefficient, and the upper 10 bits c[15:6] of the

operation results are output. Next, the c[6] value is checked and rounding is performed to 9 bits. The MSB of

the rounded 9 bits is checked, clipping is performed, and the lower 8 bits are output.

Coefficient 8

b[7:0]

Input 8

a[7:0]

a×b

10

c[15:6]

Rounding

and

clipping

8

Output

(c) Pre bright block

This block performs addition and subtraction processing independently for ports 1 and 2. The settings are as

follows.

Coefficient: 5 bits with code, MSB = code bit

Bright setting: –16 to +15 scales, variable with an accuracy of 1 bit

(Set independently for R, G and B ports 1 and 2)

Multiplication is performed using the 8-bit input and a 5-bit coefficient with code. The coefficient MSB is the

code bit. Addition is performed when b[4] = 0, and subtraction when b[4] = 1. However, when performing

subtraction, set the two's complement in the lower bits of the coefficient. When the operation results overflow

or underflow, clipping is performed.

Coefficient 5

b[4:0]

Input 8

a[7:0]

Addition/subtraction 8

and

clipping

Output

(d) User gain block

This block performs multiplication processing independently for ports 1 and 2. The settings are as follows.

Coefficient: 8 bits

Gain setting: 0 to 7.96875 (= 255/32) times, variable in 256 steps

(Settings shared by R, G and B)

Multiplication is performed using the 8-bit input and an 8-bit coefficient, and the upper 12 bits c[15:4] of the

operation results are output. Next, the c[4] value is checked and rounding is performed to 11 bits. The MSB of

the rounded 11 bits is checked, clipping is performed, and the lower 10 bits are output.

Coefficient 8

b[7:0]

Input 8

a[7:0]

a×b

12

c[15:4]

Rounding

and

clipping

10

Output

– 18 –

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