LCMXO2-256ZE-1TG100C datasheet(8/106 Pages) LATTICE

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2-4

Architecture

MachXO2 Family Data Sheet

Table 2-2. Slice Signal Descriptions

Modes of Operation

Each slice has up to four potential modes of operation: Logic, Ripple, RAM and ROM.

Logic Mode

In this mode, the LUTs in each slice are configured as 4-input combinatorial lookup tables. A LUT4 can have 16

possible input combinations. Any four input logic functions can be generated by programming this lookup table.

Since there are two LUT4s per slice, a LUT5 can be constructed within one slice. Larger look-up tables such as

LUT6, LUT7 and LUT8 can be constructed by concatenating other slices. Note LUT8 requires more than four

slices.

Ripple Mode

Ripple mode supports the efficient implementation of small arithmetic functions. In Ripple mode, the following func-

tions can be implemented by each slice:

• Addition 2-bit

• Subtraction 2-bit

• Add/subtract 2-bit using dynamic control

• Up counter 2-bit

• Down counter 2-bit

• Up/down counter with asynchronous clear

• Up/down counter with preload (sync)

• Ripple mode multiplier building block

• Multiplier support

• Comparator functions of A and B inputs

– A greater-than-or-equal-to B

– A not-equal-to B

– A less-than-or-equal-to B

Function

Type

Signal Names

Description

Input

Data signal

A0, B0, C0, D0 Inputs to LUT4

Input

Data signal

A1, B1, C1, D1 Inputs to LUT4

Input

Multi-purpose

M0/M1

Multi-purpose input

Input

Control signal

Clock enable

Input

Control signal

LSR

Local set/reset

Input

Control signal

CLK

System clock

Input

Inter-PFU signal

FCIN

Fast carry in

Output

Data signals

F0, F1

LUT4 output register bypass signals

Output

Data signals

Q0, Q1

Output

Data signals

OFX0

Output of a LUT5 MUX

Output

Data signals

OFX1

Output of a LUT6, LUT7, LUT8

2 MUX depending on the slice

Output

Inter-PFU signal

FCO

Fast carry out

1. See Figure 2-3 for connection details.

2. Requires two PFUs.

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