ECP2 datasheet(27/386 Pages) LATTICE

27 / 386 page

2-24

Architecture

Lattice Semiconductor

LatticeECP2/M Family Data Sheet

MAC sysDSP Element

In this case, the two operands, A and B, are multiplied and the result is added with the previous accumulated value.

This accumulated value is available at the output. The user can enable the input and pipeline registers, but the out-

put register is always enabled. The output register is used to store the accumulated value. The Accumulators in the

DSP blocks in the LatticeECP2/M family can be initialized dynamically. A registered overﬂow signal is also avail-

able. The overﬂow conditions are provided later in this document. Figure 2-24 shows the MAC sysDSP element.

Figure 2-24. MAC sysDSP

Multiplier

Input Data

Accumulator

Multiplier

Multiplicand

Signed A

Serial Register B in

Serial Register A in

SROB

SROA

Output

Addn

Accumsload

Pipeline

CLK (CLK0,CLK1,CLK2,CLK3)

CE (CE0,CE1,CE2,CE3)

RST(RST0,RST1,RST2,RST3)

Input

Pipeline

Input

Pipeline

Input

Pipeline

To Accumulator

Signed B

Pipeline

Input

To Accumulator

Overflow

signal

m+n

(default)

m+n+16

(default)

m+n+16

(default)

Preload

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