LFEC10 datasheet(9/163 Pages) LATTICE

9 / 163 page

2-6

Architecture

Lattice Semiconductor

LatticeECP/EC Family Data Sheet

Figure 2-5. Distributed Memory Primitives

ROM Mode: The ROM mode uses the same principal as the RAM modes, but without the Write port. Pre-loading is

accomplished through the programming interface during conﬁguration.

PFU Modes of Operation

Slices can be combined within a PFU to form larger functions. Table 2-4 tabulates these modes and documents the

functionality possible at the PFU level.

Table 2-4. PFU Modes of Operation

Logic

Ripple

RAM

ROM

LUT 4x8 or

MUX 2x1 x 8

2-bit Add x 4

SPR16x2 x 4

DPR16x2 x 2

ROM16x1 x 8

LUT 5x4 or

MUX 4x1 x 4

2-bit Sub x 4

SPR16x4 x 2

DPR16x4 x 1

ROM16x2 x 4

LUT 6x 2 or

MUX 8x1 x 2

2-bit Counter x 4

SPR16x8 x 1

ROM16x4 x 2

LUT 7x1 or

MUX 16x1 x 1

2-bit Comp x 4

ROM16x8 x 1

1. These modes are not available in PFF blocks

DO1

DO0

DI0

DI1

AD0

AD1

AD2

AD3

WRE

DO0

AD0

AD1

AD2

AD3

DPR16x2

SPR16x2

ROM16x1

RDO1

RDO0

DI0

DI1

WCK

WRE

WDO1

WDO0

WAD0

WAD1

WAD2

WAD3

RAD0

RAD1

RAD2

RAD3

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