SLG46721 datasheet(37/101 Pages) DIALOG

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SLG46721

9.0 Combinatorial Logic

Combinatorial logic is supported via nine Lookup Tables (LUTs) within the SLG46721. There are two 2-bit LUTs and seven 3-bit

LUTs. The device also includes eight Combination Function Macrocells that can be used as LUTs. For more details, please see

Section 10.0 Combination Function Macrocells.

Inputs/Outputs for the nine LUTs are configured from the connection matrix with specific logic functions being defined by the state

of NVM bits. The outputs of the LUTs can be configured to any user defined function, including the following standard digital logic

devices (AND, NAND, OR, NOR, XOR, XNOR).

9.1 2-Bit LUT

The two 2-bit LUTs each take in two input signals from the connection matrix and produce a single output, which goes back into

the connection matrix. .

Each 2-bit LUT uses a 4-bit register signal to define their output functions;

2-Bit LUT4 is defined by reg<590:587>

2-Bit LUT5 is defined by reg<594:591>

The table below shows the register bits for the standard digital logic devices (AND, NAND, OR, NOR, XOR, XNOR) that can be

created within each of the two 2-bit LUT logic cells.

Figure 7. 2-bit LUTs

Table 28. 2-bit LUT Standard Digital Functions.

Function

MSB

LSB

AND-2

000

NAND-2

OR-2

110

NOR-2

XOR-2

110

XNOR-2

001

2-bit LUT4 OUT

IN1

IN0

reg <590:587>

From Connection

Matrix Output <70>

From Connection

Matrix Output <71>

To Connection

Matrix Input <37>

2-bit LUT5 OUT

IN1

IN0

reg <594:591>

From Connection

Matrix Output <72>

From Connection

Matrix Output <73>

To Connection

Matrix Input <38>

Table 26. 2-bit LUT4 Truth Table.

IN1

IN0

OUT

reg <587>

reg <588>

reg <589>

reg <590>

Table 27. 2-bit LUT5 Truth Table.

IN1

IN0

OUT

reg <591>

reg <592>

reg <593>

reg <594>

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