CS4953 datasheet(22/44 Pages) CIRRUS

22 / 44 page

CS4952/53

DS223PP2

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

Address

NTSC-MC

CIR601

NTSC-MCCI

R60

(Japan)

NTSC-MR

S170A

PAL-B,D,

G,H,I

PAL-M

PAL-N

PAL-NCom

(Argentina)

0x00

CONTROL_0

01h

21h

41h

61h

A1h

81h

0x01

CONTROL_1

04h

00h

04h

0x10

SC_AMP

1Ch

15h

0x11

SC_SYNTH0

3Eh

96h

4Eh

96h

8Ch

0x12

SC_SYNTH1

F8h

15h

4Ah

15h

28h

0x13

SC_SYNTH2

E0h

13h

E1h

13h

EDh

0x14

SC_SYNTH3

43h

54h

43h

54h

43h

Table 2. Multi-standard Format Register Configurations

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

CS4953 データシート(PDF) 22 Page - Cirrus Logic

CS4953 データシート(HTML) 22 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

データシートダウンロード