BT848 ETC, BT848 Datasheet - Page 19

• Manufacturer Part Number: BT848
• Description: Single-Chip Video Capture for PCI
• Manufacturer: ETC

Bt848/848A/849A
Single-Chip Video Capture for PCI
Table 2. Pin Descriptions Grouped by Pin Function (3 of 6)
Brooktree
Pin #
82–89,
92–99,
110–117
119
118
108
141
143
145
139
138
154
147
131
®
Pin Name
GPIO[23:0]
GPIO[23]
GPIO[22]
GPIO[21]
GPIO[20]
GPIO[19]
GPIO[18]
GPIO[17]
GPIO[16]
GPIO[9]
GPIO[8]
GPIO[7:0]
GPINTR
GPWE
GPCLK
MUX0
MUX1
MUX2
MUXOUT
YIN
CIN
SYNCDET
MUX3
AGCCAP
I/O
I/O
I
I
I/O
I
I
I
O
I
I
I
I
A
O
O
O
O
O
O
O
O
I
I
I
Signal
General Purpose
I/O
Clkx1
Field
Vactive
Vsync
Hactive
Hsync
Composite Active
Composite Sync
Vsync/Field
Hsync
Video Data Input at
GPCLK = CLKX2
rate
GP Interrupt
GP Write Enable
GP Clock
General Purpose I/O (27 pins)
Input Stage (14 pins)
L848A_A
Description
24 bits of programmable I/O. These pins are internally pulled
up to VDDG.
Bt848A and Bt849A pin decoding when in digital video input
and SPI mode.
GP port requests an interrupt. Internally pulled up to VDDG.
to VDDG.
Video clock. Internally pulled up to VDDG.
Analog composite video inputs to the on-chip input multi-
plexer. Used to select between three composite sources or
two composite and one S-video source. Unused pins should
be connected to ground.
The analog video output of the 3 to 1 multiplexer. Must con-
nect to the YIN pin.
The analog composite or luma input to theY-ADC.
The analog chroma input to the C-ADC.
The sync stripper input used to generate timing information
for the AGC circuit. Must be connected through a 0.1 F
capacitor to the same source as the Y-ADC. A 1 M bleeder
resistor should be connected to ground.
In the Bt848A and Bt849A the SYNCDET is not required and
is used as a fourth mux input.
plexer. Used to select between three composite sources or
two composite and one S-video source. Unused pins should
be connected to ground.
The AGC time constant control capacitor node. Must be con-
nected to a 0.1 F capacitor to ground.
GP port write enable for registered inputs. Internally pulled up
Analog composite video inputs to the on-chip input multi-
F
UNCTIONAL
Pin Descriptions
D
ESCRIPTION
9