SAA7126H Просмотр технического описания (PDF) - Philips Electronics

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производитель

SAA7126H

Digital video encoder

Philips Electronics 

Philips Semiconductors

Digital video encoder

Product specification

SAA7126H; SAA7127H

Table 24 Subaddress 62H

DATA BYTE

BSTA

DESCRIPTION

amplitude of colour burst;

input representation in

accordance with

“CCIR 601”

CONDITIONS

white-to-black = 92.5 IRE;

burst = 40 IRE; NTSC encoding

BSTA = 0 to 2.02 × nominal

white-to-black = 92.5 IRE;

burst = 40 IRE; PAL encoding

BSTA = 0 to 2.82 × nominal

white-to-black = 100 IRE;

burst = 43 IRE; NTSC encoding

BSTA = 0 to 1.90 × nominal

white-to-black = 100 IRE;

burst = 43 IRE; PAL encoding

BSTA = 0 to 3.02 × nominal

REMARKS

recommended value:

BSTA = 63 (3FH)

recommended value:

BSTA = 45 (2DH)

recommended value:

BSTA = 67 (43H)

recommended value:

BSTA = 47 (2FH); default after

reset

Table 25 Subaddresses 63H to 66H (four bytes to program subcarrier frequency)

DATA BYTE

DESCRIPTION

FSC0 to FSC3

fsc = subcarrier frequency

(in multiples of line

frequency); fllc = clock

frequency (in multiples of

line frequency)

CONDITIONS

FSC

=

round





f-f-l-s-l-cc-

×

232

;

note 1

REMARKS

FSC3 = most significant byte;

FSC0 = least significant byte

Note

1. Examples:

a) NTSC-M: fsc = 227.5, fllc = 1716 → FSC = 569408543 (21F07C1FH).

b) PAL-B/G: fsc = 283.7516, fllc = 1728 → FSC = 705268427 (2A098ACBH).

Table 26 Subaddresses 67H to 6AH

DATA BYTE

L21O0

L21O1

L21E0

L21E1

DESCRIPTION

first byte of captioning data, odd field

second byte of captioning data, odd field

first byte of extended data, even field

second byte of extended data, even field

REMARKS

LSBs of the respective bytes are encoded

immediately after run-in and framing code, the

MSBs of the respective bytes have to carry the

parity bit, in accordance with the definition of

line 21 encoding format.

2002 Oct 15

19

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