SLG46170 datasheet(42/87 Pages) DIALOG

42 / 87 page

000-0046170-103

Page 41 of 86

SLG46170

Each Macrocell, when programmed for a LUT function, uses a 4-bit register to define their output function:

2-Bit LUT0 is defined by reg<575:572>

10.1.2 2-Bit LUT or D Flip Flop Macrocells Used as D Flip Flop Register Settings

10.2 3-Bit LUT or Pipe Delay Macrocell

There is one macrocell that can serve as either a 3-bit LUT or as a Pipe Delay.

When used to implement LUT functions, the 3-bit LUT takes in three input signals from the connection matrix and produces a

single output, which goes back into the connection matrix.

When used as a pipe delay, there are three inputs signals from the matrix, Input (IN), Clock (CLK) and Reset (RST). The pipe

delay cell is built from 16 D Flip-Flop logic cells that provide the three delay options, two of which are user selectable. The DFF

cells are tied in series where the output (Q) of each delay cell goes to the next DFF cell. The first delay option (ONE PIPE OUT)

is fixed at the output of the first flip-flop stage. The other two outputs (OUT0 and OUT1) provide user selectable options for 1 –

16 stages of delay. There are delay output points for each set of the OUT0 and OUT1 outputs to a 4-input mux that is controlled

by reg <664:661> for OUT0 and reg <668:665> for OUT1. The 4-input mux is used to control the selection of the amount of delay.

The overall time of the delay is based on the clock used in the SLG46170 design. Each DFF cell has a time delay of the inverse

of the clock time (either external clock or the RC Oscillator within the SLG46722). The sum of the number of DFF cells used will

be the total time delay of the Pipe Delay logic cell.

Table 44. DFF4 Register Settings

Signal Function

Address

LUT2_0 or DFF4

Select

596

0: LUT2_0

1: DFF4

DFF4 or Latch

Select

572

0: DFF function

1: Latch function

DFF4 Output Select

573

0: Q output

1: nQ output

DFF4 Initial Polarity

Select

574

0: Low

1: High

SLG46170 Datasheet(PDF) 42 Page - Dialog Semiconductor