LF48212 Datasheet, PDF (1/9 Pages) LOGIC Devices Incorporated – 12 x 12-bit Alpha Mixer

DEVICES INCORPORATED
DEVICES INCORPORATED
LF48212
12 x 12_L-b_Fit A₄lp₈h₂a ₁Mi₂xer
12 x 12-bit Alpha Mixer
FEATURES
u 50 MHz Data and Computation
Rate
u Two’s Complement or Unsigned
Operands
u On-board Programmable Delay
Stages
u Programmable Output Rounding
u Replaces Harris HSP48212
u Package Styles Available:
• 68-pin PLCC, J-Lead
• 64-pin PQFP
LF48212 BLOCK DIAGRAM
DESCRIPTION
The LF48212 is a high-speed video
alpha mixer capable of mixing video
signals at real-time video rates. It
takes two 12-bit video signals and
mixes them together using an alpha
mix factor. Alpha determines the
weighting that each video signal
receives during the mix operation.
The input video data can be in either
unsigned or two’s complement
format, but both inputs must be in the
same format. Independently con-
trolled programmable delay stages are
provided for the input and control
signals to allow for allignment of
input data if necessary. The delay
stages can be programmed to have
from 0 to 7 delays. The 13-bit output
of the alpha mixer is registered with
three-state drivers and may be
rounded to 8, 10, 12, or 13-bits.
α11-0
12
DINA11-0
12
DINB11-0
12
BYPASS
DEL
15
DELAY CONTROL
REGISTER
LD
0-7
0-7
0-7
FORMAT
FORMAT
CLK
MIXEN
OE
α
1.0 – α
TC
2
RND1-0
NOTE: NUMBERS IN REGISTERS INDICATE
NUMBER OF PIPELINE DELAYS.
1
ADJUST
FORMAT
13
DOUT12-0
Video Imaging Products
08/16/2000–LDS.48212-F