SAA7126H Datasheet, PDF (18/40 Pages) NXP Semiconductors – Digital video encoder

Philips Semiconductors
Digital video encoder
Product specification
SAA7126H; SAA7127H
Table 24 Subaddress 62BH
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
CONDITIONS
FSC0 to FSC3
f_fsc = subcarrier frequency
(in multiples of line
frequency); f_llc = clock
frequency (in multiples of
line frequency)
FSC
=

round

f-f-_f-l-s-l-c-c
×
2³²ï£·ï£¶

;
note 1
REMARKS
FSC3 = most significant byte;
FSC0 = least significant byte
Note
1. Examples:
a) NTSC-M: f_fsc = 227.5, f_llc = 1716 → FSC = 569408543 (21F07C1FH).
b) PAL-B/G: f_fsc = 283.7516, f_llc = 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.
1999 May 31
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