FS453/4 AND FS455/6 DATA SHEET: HARDWARE REFERENCE
5.2 Pin Descriptions
Pin
Name FBGA
Pin
Number
PQFP
Pin
Number
Type/Value Pin Function Description
Clocks
CLKOUT D13 56 GTL/LVCMOS
output Pixel Clock Output. Clock to Graphics
Control Chip (GCC) clock input. Synthesized
from XTAL_IN. 0.78125 to 150 MHz range.
Supports 1.5 to 3.3 volt CMOS or GTL.
CLKIN_P E13 54 Differential
input Pixel Clock Input Positive. Clock from
GCC’s buffered form of CLKOUT. Used to
latch input pixel data.
CLKIN_N G12 51 Differential
input Pixel Clock Input Negative. Clock from
GCC’s buffered form of CLKOUT. Used to
latch input pixel data. For single-clocked use,
tie CLKIN_N to PREF.
XTAL_IN B10 63 LVTTL input
Television reference Clock Input. 27 MHz
reference clock input for the video encoder for
use with either external oscillator or 27 MHz
crystal.
XTAL_OUT A11 62 LVTTL output
Television Clock XTAL Output. Buffered
version of XTAL_IN. For use with a 27 MHz
crystal.
Global Controls
RESET_L F12 53 TTL input
(internal pull
down)
Reset. Active Low. Resets internal state
machines and initializes default register
values.
RSVD0 N11 39 TTL input
(internal pull
down)
Reserved. Manufacturing Test Pin. Tie to
VSS.
GPIO3-GPIO0 C1,C2,F1
3,G13 2,3,52,
50 TTL
input/output
General Purpose Input/Output. GPIO port.
Digital RGB/YCrCb Input/Outputs
P23-P0/V656 M9,N8,M8
N6,M6,N5
M5,N4,M4
N3,L1,K2
K1,J2,J1
H2,H1,G2
G1,F2,F1
E2,E1,D2
34,33,32,
29,28,27,
26,25,24,
23,18,17,
16,15,14,
13,12,11,
10,9,8,
7,6,5
GTL/TTL
input/output Digital GTL/TTL input port. Multiplexed
digital video input. Connects to GCC's digital
video out. In 12 bit input modes, P23-P12 are
available for ITU-R BT.656 Video Output. P18-
P12 contain the video data with embedded
control codes while P21, P22, and P23 output
HSync, VSync, and Field respectively.
PREF H12 49 GTL/TTL REF Digital GTL/TTL Port Reference input.
Voltage threshold reference for GTL/TTL
inputs. Set to the center of the input data logic
high and low levels, but not to exceed Voltage
Reference Range (see Electrical
Characteristics on page 25).
HSYNC N9 35 GTL/TTL I/O Digital HSYNC VGA I/O. Connects to GCC
HSync.
VSYNC M10 36 GTL/TTL I/O Digital VSYNC VGA I/O. Connects to GCC
VSync.
JANUARY, 2005, VERSION 3.0 17 COPYRIGHT ©2003-4 FOCUS ENHANCEMENTS, INC.
FOCUS Enhancements Semiconductor