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DS1036 - Platform Manager Data Sheet - Lattice Semiconductor

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Figure 40. PFU Diagram<br />

Slice<br />

Slice 0<br />

55<br />

<strong>Platform</strong> <strong>Manager</strong> <strong>Data</strong> <strong>Sheet</strong><br />

LUT4 & LUT4 &<br />

LUT4 & LUT4 &<br />

LUT4 & LUT4 &<br />

LUT4 & LUT4 &<br />

FCIN CARRY CARRY<br />

CARRY CARRY<br />

CARRY CARRY<br />

CARRY CARRY FCO<br />

D<br />

FF/<br />

Latch<br />

D<br />

FF/<br />

Latch<br />

D<br />

FF/<br />

Latch<br />

Slice 1<br />

D<br />

FF/<br />

Latch<br />

From<br />

Routin g<br />

To<br />

Routin g<br />

Slice 2<br />

Slice 3<br />

Each slice contains two LUT4 lookup tables feeding two registers (programmed to be in FF or Latch mode), and<br />

some associated logic that allows the LUTs to be combined to perform functions such as LUT5, LUT6, LUT7, and<br />

LUT8. There is control logic to perform set/reset functions (programmable as synchronous/asynchronous), clock<br />

select, chip-select, and wider RAM/ROM functions. Figure 41 shows an overview of the internal logic of the slice.<br />

The registers in the slice can be configured for positive/negative and edge/level clocks.<br />

There are 14 input signals: 13 signals from routing and one from the carry-chain (from the adjacent slice/PFU).<br />

There are 7 outputs: 6 to the routing and one to the carry-chain (to the adjacent slice/PFU). Table 14 lists the signals<br />

associated with each slice.<br />

D<br />

FF/<br />

Latch<br />

D<br />

FF/<br />

Latch<br />

D<br />

FF/<br />

Latch<br />

D<br />

FF/<br />

Latch

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