PRODUCT SPECIFICATION
TMC2246A
Block Diagram
D19-0 C110-0 ENB1 D29-0 C210-0 ENB2 D39-0 C310-0 ENB3 D4 9-0 C410-0 ENB4
ENSEL
ACC
FSEL
*
2 -10
25
OCEN
LSB
MSB
CLK
OEN
*Automatic rounding function
S15-0
Functional Description
The TMC2246A Image Filter is a flexible multiplier-summer
array which computes the accumulated sum of four 11x10
bit products, allowing word growth up to 25 bits.
The inputs are user-configurable, allowing latching of either
the 10- or 11-bit input data. The data format is user-selectable
between integer or fractional two’s complement arithmetic.
Total latency from input registers to output data port is 5
clocks.
The output data path is 16 bits wide, providing the lower 16
bits of the accumulator when in integer format or the upper
16 bits of the 25-bit accumulator path when fractional two’s
complement notation is selected. One-time rounding to 16
bits is performed automatically when accumulating frac-
tional data, but is disabled when operating in integer format
to maintain the integrity of the least-significant bits.
2
REV. 1.0.3 9/11/00
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
