SAA7108AE Datasheet, PDF (114/208 Pages) NXP Semiconductors – HD-CODEC

NXP Semiconductors
SAA7108AE; SAA7109AE
HD-CODEC
Table 70. Burst amplitude register, subaddress 62h, bit description
Legend: * = default value after reset, ^ = recommended value.
Bit Symbol Access Value Description
7
RTCE R/W
real-time control
0* no real-time control of generated subcarrier frequency
1
real-time control of generated subcarrier frequency through a
NXP video decoder; for a specification of the RTC protocol
see document “How to use Real Time Control (RTC)”,
available on request
6 to 0 BSTA[6:0] R/W
amplitude of color burst; input representation in accordance
with ‘ITU-R BT.601’
3Fh white-to-black = 92.5 IRE; burst = 40 IRE; NTSC encoding;
(63)^ BSTA = 0 to 2.02 × nominal
2Dh white-to-black = 92.5 IRE; burst = 40 IRE; PAL encoding;
(45)^ BSTA = 0 to 2.82 × nominal
43h white-to-black = 100 IRE; burst = 43 IRE; NTSC encoding;
(67)^ BSTA = 0 to 1.90 × nominal
2Fh white-to-black = 100 IRE; burst = 43 IRE; PAL encoding;
(47)*^ BSTA = 0 to 3.02 × nominal
Table 71. Subcarrier 0, 1, 2 and 3 registers, subaddresses 63h to 66h, bit description
Subaddress Bit Symbol Access Value Description
66h
7 to 0 FSC[31:24] R/W -
f_fsc = subcarrier frequency (in multiples of line
65h
7 to 0 FSC[23:16] R/W -
frequency); f_llc = clock frequency (in multiples
of line frequency); FSC[31:24] = most
64h
7 to 0 FSC[15:08] R/W -
significant byte; FSC[07:00] = least significant
63h
7 to 0 FSC[07:00] R/W -
byte^[1]
[1]
FSC
=
round


-^f-_f---_lf--_ls-_c-^c
×
2³²_
Examples:
a) NTSC M: f_fsc = 227.5, f_llc = 1716 → FSC = 569408543 (21F0 7C1Fh).
b) PAL B/G: f_fsc = 283.7516, f_llc = 1728 → FSC = 705268427 (2A09 8ACBh).
Table 72. Line 21 odd 0, 1 and even 0, 1 registers, subaddresses 67h to 6Ah, bit
description^[1]
Subaddress Bit Symbol
Access Value Description
67h
7 to 0 L21O[07:00] R/W -
first byte of captioning data, odd field
68h
7 to 0 L21O[17:10] R/W -
second byte of captioning data, odd field
69h
7 to 0 L21E[07:00] R/W -
first byte of extended data, even field
6Ah
7 to 0 L21E[17:10] R/W -
second byte of extended data, even field
[1] 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.
SAA7108AE_SAA7109AE_3
Product data sheet
Rev. 03 — 6 February 2007
© NXP B.V. 2007. All rights reserved.
114 of 208