BT856 datasheet(7/54 Pages) ETC

7 / 54 page

Brooktree®

CIRCUIT DESCRIPTION

Pin Descriptions

Pin Name

I/O

Pin #

Description

CVBS/B

Composite video with blanking and sync, or Blue.

CVBS/G

Composite video with blanking and sync, or Green.

C/R

Modulated chrominance, or Red.

Y/CVBS

Luminance (with blanking, sync, and, optionally, Macrovision pulses,

and/or closed-captioning encoding), or Composite video.

RGBOUT

Analog RGB control input (TTL compatible). A logical one conﬁgures

the device to output analog RGB (RGBOUT mode). A logical zero con-

ﬁgures the device to generate S-video along with a second composite

video output. This pin may be connected directly to VAA or GND.

FIELD

Field control output (TTL compatible). FIELD transitions after the rising

edge of CLOCK, two clock cycles following falling HSYNC*. It is a logi-

cal zero during odd ﬁelds and is a logical one during even ﬁelds.

TEST

12, 27

These pins are reserved for testing and must be connected to a logical

zero, such as GND, for normal operation.

GAMMA*

RGB gamma control input (TTL compatible). In RGB mode, a logical

zero enables the gamma correction circuitry. For RGB mode, a logical

one provides a linear response. In 8-bit YC mode, this pin is used to

select between inputs on B0–B7 (logical one) or G0–G7 (logical zero)

pixel ports. In RGBOUT mode, if bit D4 of register 0xDC is low, this pin

can be used to enable upsampling (logical zero) or disable upsampling

(logical one). In RGBOUT mode, the GAMMA* pin will also select an

oversampling ﬁlter (on the G0–G7 port for 8-bit YCmode) when low,

unless overridden by the combination of bits D2 at subaddress 0xDA

and D4 at subaddress 0xDC. This override will enable/disable oversam-

pling for any input to RGB outputs. This pin may be connected directly

to VAA or GND.

YC MODE

RGB or YCrCb select input (TTL compatible). A logical one conﬁgures

the pixel inputs for YCrCb operation (YC mode). A logical zero conﬁg-

ures the pixel inputs for RGB operation (RGB mode), and can be

switched on each clock cycle. This pin may be connected directly to

VAA or GND.

BT856 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

BT856 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers

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 45 46 47 48 49 50 51 52 53 54

Datasheet Download

Link URL