SAA7121 Ver la hoja de datos (PDF) - Philips Electronics

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componentes Descripción

Fabricante

SAA7121

Digital Video Encoder (ConDENC)

Philips Electronics 

Philips Semiconductors

Digital Video Encoder (ConDENC)

Preliminary specification

SAA7120; SAA7121

Table 11 Subaddress 3A

DATA BYTE

UV2C

Y2C

SYMP

CBENB

LOGIC

LEVEL

0

1

0

1

0

1

0

1

DESCRIPTION

Cb, Cr data are two’s complement

Cb, Cr data are straight binary; default after reset

Y data is two’s complement

Y data is straight binary; default after reset

horizontal and vertical trigger is taken from RCV2 and RCV1 respectively; default after reset

horizontal and vertical trigger is decoded out of “CCIR 656” compatible data at MP port

data from input ports is encoded; default after reset

colour bar with fixed colours is encoded

Table 12 Subaddress 5A

DATA BYTE

DESCRIPTION

CHPS

phase of encoded colour subcarrier

(including burst) relative to horizontal sync;

can be adjusted in steps of

360/256 degrees

VALUE

RESULT

3FH PAL-B/G and data from input ports

69H PAL-B/G and data from look-up table

67H NTSC-M and data from input ports

89H NTSC-M and data from look-up table

Remark: in subaddresses 5B, 5C, 5D, 5E and 62 all IRE values are rounded up.

Table 13 Subaddress 5B and 5D

DATA BYTE

DESCRIPTION

GAINU

variable gain for

Cb signal; input

representation

accordance with

“CCIR 601”

CONDITIONS

white-to-black = 92.5 IRE

GAINU = 0

GAINU = 118 (76H)

white-to-black = 100 IRE

GAINU = 0

GAINU = 125 (7DH)

REMARKS

GAINU = −2.17 × nominal to +2.16 × nominal

output subcarrier of U contribution = 0

output subcarrier of U contribution = nominal

GAINU = −2.05 × nominal to +2.04 × nominal

output subcarrier of U contribution = 0

output subcarrier of U contribution = nominal

Table 14 Subaddress 5C and 5E

DATA BYTE

DESCRIPTION

GAINV

variable gain for

Cr signal; input

representation

accordance with

“CCIR 601”

CONDITIONS

white-to-black = 92.5 IRE

GAINV = 0

GAINV = 165 (A5H)

white-to-black = 100 IRE

GAINV = 0

GAINV = 175 (AFH)

REMARKS

GAINV = −1.55 × nominal to +1.55 × nominal

output subcarrier of V contribution = 0

output subcarrier of V contribution = nominal

GAINV = −1.46 × nominal to +1.46 × nominal

output subcarrier of V contribution = 0

output subcarrier of V contribution = nominal

1997 Jan 06

15

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