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LF2247QC15 fiches techniques PDF

LOGIC Devices Incorporated - Image Filter with Coefficient RAM

Numéro de référence LF2247QC15
Description Image Filter with Coefficient RAM
Fabricant LOGIC Devices Incorporated 
Logo LOGIC Devices Incorporated 





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LF2247QC15 fiche technique
DEVICES INCORPORATED
DEVICES INCORPORATED
LF2247
LF2247Image Filter with Coefficient RAM
Image Filter with Coefficient RAM
FEATURES
u 66 MHz Data Input and Compu-
tation Rate
u Four 11 x 10-bit Multipliers with
Individual Data and Coefficient
Inputs and a 25-bit Accumulator
u Four 32 x 11-bit Serially Loadable
Coefficient Registers
u Fractional or Integer Two’s
Complement Operands
u Package Styles Available:
• 84-pin PLCC, J-Lead
• 100-pin PQFP
LF2247 BLOCK DIAGRAM
ENBA
5
A4-0
DESCRIPTION
The LF2247 consists of an array of four
11 x 10-bit registered multipliers
followed by a summer and a 25-bit
accumulator. The LF2247 provides a
coefficient register file containing four
32 x 11-bit registers which are capable
of storing 32 different sets of filter
coefficients for the multiplier array.
All multiplier data inputs are user
accessible and can be updated every
clock cycle with either fractional or
integer two’s complement data. The
pipelined architecture has fully
registered input and output ports and
an asynchronous three-state output
enable control to simplify the design
of complex systems. The pipeline
latency for all inputs is five clock
cycles.
A 25-bit accumulator path allows
cumulative word growth which may
be internally rounded to 16 bits.
Output data is updated every clock
cycle and may be held under user
control. The data inputs/outputs and
control inputs are registered on the
rising edge of CLK. The Serial Data In
signal, SDIN, is registered on the
COEFFICIENT REGISTER FILE
SDIN
SEN
SCLK
Coefficient
Register 1
(32 x 11-bit)
D19-0 ENB1
10 11
SEN
SCLK
Coefficient
Register 2
(32 x 11-bit)
D29-0 ENB2
10 11
SEN
SCLK
Coefficient
Register 3
(32 x 11-bit)
D39-0 ENB3
10 11
SEN
SCLK
Coefficient
Register 4
(32 x 11-bit)
D49-0 ENB4
10 11
1
2
3
4
5
6
7
8
9
10
ACC
FSEL
22
25
MS LS
22
OCEN
11
OEN
CLK
TO ALL REGISTERS
(EXCEPT COEFFICIENT REGISTERS)
16
S15-0
1
Video Imaging Products
08/16/2000–LDS.2247-H

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