CS4953 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS4953

NTSC/PAL Digital Video Encoder

Cirrus Logic 

CS4952/53

Address

0x00

0x01

0x10

0x11

0x12

0x13

0x14

Register

CONTROL_0

CONTROL_1

SC_AMP

SC_SYNTH0

SC_SYNTH1

SC_SYNTH2

SC_SYNTH3

NTSC-MCCI

NTSC-MC

R60

NTSC-MR

CIR601

(Japan)

S170A

01h

01h

21h

04h

00h

04h

1Ch

1Ch

1Ch

3Eh

3Eh

3Eh

F8h

F8h

F8h

E0h

E0h

E0h

43h

43h

43h

PAL-B,D,

G,H,I

41h

04h

15h

96h

15h

13h

54h

PAL-M

61h

04h

15h

4Eh

4Ah

E1h

43h

PAL-N

A1h

04h

15h

96h

15h

13h

54h

PAL-NCom

(Argentina)

81h

04h

15h

8Ch

28h

EDh

43h

Table 2. Multi-standard Format Register Configurations

(Slave Mode, interlaced timing, non-656 data)

Digital Video Input Modes

The CS4952/3 provides 2 different digital video in-

put modes that are selectable through the

IN_MODE bit of the CONTROL_0 register.

In mode 0 and upon RESET, the CS4952/3 defaults

to output a solid color (1 of a possible of 256 col-

ors). The background color is selected by writing

the BKG_COLOR register (0x08). The colorspace

of the register is RGB 3:3:2 and is unaffected by

gamma correction. The default color following RE-

SET is blue.

In mode 1 the CS4952/3 supports a single 8-bit

27 MHz CbYCrY source as input on the V [7:0]

pins. Input video timing can be CCIR601 master or

slave and progressive scan.

Multi-standard Output Format Modes

The CS4952/53 supports a wide range of output

formats compatible with worldwide broadcast stan-

dards. These formats include NTSC-M,

PAL-B/D/G/H/I, PAL-M, PAL-N and PAL Combi-

nation N (PAL-Nc) which is the broadcast standard

used in Argentina. After RESET, the CS4952/53 de-

faults to NTSC-M operation with CCIR601 analog

timing. NTSC-M can also be supported in the Japa-

nese format by turning off the 7.5 IRE pedestal

through the PED bit in the CONTROL_1 register

(0x01).

Output formats are configured by writing control

registers as shown in Table 2.

Subcarrier Generation

The CS4952/3 automatically synthesizes NTSC

and PAL color subcarrier clocks using the CLK fre-

quency and four control registers

(SC_SYNTH0/1/2/3). The NTSC subcarrier syn-

thesizer is reset every four fields and every eight

fields for PAL.

The SC_SYNTH0/1/2/3 registers used together

provide a 32-bit value which defaults to NTSC val-

ues of 43E0F83Eh following reset.

Table 3 indicates the 32-bit value required for the

different broadcast formats.

Subcarrier Compensation

Since the subcarrier is synthesized from CLK the

subcarrier frequency error will track the clock fre-

quency error. If the input clock has a tolerance of

200 ppm then the resulting subcarrier will also

have a tolerance of 200 ppm. Per the NTSC speci-

fication the final subcarrier tolerance is ±10 Hz

which is more like 3 ppm. Care must be taken in se-

lecting a suitable clock source.

In MPEG-2 system environments the clock is actu-

ally recovered from the data stream. In these cases

the recovered clock can be 27 MHz ±50 ppm or

22

DS223PP2

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