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LMA1009

LOGIC Devices Incorporated
Part Number LMA1009
Manufacturer LOGIC Devices Incorporated
Description 12 x 12-bit Multiplier-Accumulator
Published Apr 25, 2005
Detailed Description LMA 1009/2009 DEVICES INCORPORATED 12 x 12-bit Multiplier-Accumulator LMA1009/2009 DEVICES INCORPORATED 12 x 12-bit ...
Datasheet PDF File LMA1009 PDF File

LMA1009
LMA1009

Overview
LMA 1009/2009 DEVICES INCORPORATED 12 x 12-bit Multiplier-Accumulator LMA1009/2009 DEVICES INCORPORATED 12 x 12-bit Multiplier-Accumulator DESCRIPTION Data present at the A and B input registers is latched on the rising edges of CLK A and CLK B respectively.
RND, TC, ACC, and SUB controls are latched on the rising edge of the logical OR of CLK A and CLK B.
TC specifies the input as two’s complement (TC HIGH) or unsigned magnitude (TC LOW).
RND, when HIGH, adds ‘1’ to the most significant bit position of the least significant half of the product.
SubThe LMA1009/2009 produces the 24-bit sequent truncation of the 12 least signifiproduct of two 12-bit numbers.
The cant bits produces a result correctly results of a series of multiplications may rounded to 12-bit precision.
be accumulated to form the sum of products.
Accumulation is performed to The ACC and SUB inputs control accu27-bit precision with the multiplier prod- mulator operation.
ACC HIGH results in addition of the multiplier product and uct sign extended as appropriate.
the accumulator contents, with the result stored in the accumulator register on the rising edge of CLK R.
ACC and SUB A 11-0 B 11-0 HIGH results in subtraction of the accu12 12 mulator contents from the multiplier A REGISTER B REGISTER product, with the result stored in the accumulator register.
With ACC LOW and SUB LOW, no accumulation occurs and the next product is loaded directly into the accumulator register.
ACC LOW and SUB HIGH is undefined.
The LMA1009 and LMA2009 are highspeed, low power 12-bit multiplier-accumulators.
They are pin-for-pin equivalent to the TRW TDC1009/TMC2009 multiplier-accumulators.
The LMA1009 and LMA2009 are functionally identical; they differ only in packaging.
Full ambient temperature range operation is achieved by the use of advanced CMOS technology.
24 R R + A A 27 FEATURES u 20 ns Multiply-Accumulate Time u Low Power CMOS Technology u Replaces Fairchild TDC1009/ TMC2009 u Two’s Complement or Unsigned Opera...


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