OR2C04A datasheet(19/192 Pages) ETC

19 / 192 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 2 FPGAs

Programmable Logic Cells (continued)

Inter-PLC Routing Resources

The inter-PLC routing is used to route signals between

PLCs. The lines occur in groups of four, and differ in the

numbers of PLCs spanned. The X1 lines span one

PLC, the X4 lines span four PLCs, the XH lines span

one-half the width (height) of the PLC array, and the XL

lines span the width (height) of the PLC array. All types

of lines run in both horizontal and vertical directions.

Table 5 shows the groups of inter-PLC lines in each

PLC. In the table, there are two rows/columns each for

X1 and X4 lines. In the design editor, the horizontal X1

and X4 lines are located above and below the PFU.

Similarly, the vertical segments are located on each

side. The XL and XH lines only run below and to the left

of the PFU. The indexes specify individual lines within a

group. For example, the VX4[2] line runs vertically to

the left of the PFU, spans four PLCs, and is the third

line in the 4-bit wide bus.

Table 5. Inter-PLC Routing Resources

Figure 21 shows the inter-PLC routing within one PLC.

Figure 22 provides a global view of inter-PLC routing

resources across multiple PLCs.

5-4528(F)

Figure 21. Single PLC View of Inter-PLC Lines

X1 Lines. There are a total of 16 X1 lines per PLC:

eight vertical and eight horizontal. Each of these is sub-

divided into nibble-wide buses: HX1[3:0], HX1[7:4],

VX1[3:0], and VX1[7:4]. An X1 line is one PLC long.

If a net is longer than one PLC, an X1 line can be

lengthened to n times its length by turning on n – 1

CIPs. A signal is routed onto an X1 line via the switch-

ing lines.

X4 Lines. There are four sets of four X4 lines, for a

total of 16 X4 lines per PLC. They are HX4[3:0],

HX4[7:4], VX4[3:0], and VX4[7:4]. Each set of X4 lines

is twisted each time it passes through a PLC, and one

of the four is broken with a CIP. This allows a signal to

be routed for a length of four cells in any direction on a

single line without additional CIPs. The X4 lines can be

used to route any nets that require minimum delay. A

longer net is routed by connecting two X4 lines

together by a CIP. The X4 lines are accessed via the

switching lines.

Horizontal

Lines

Vertical

Lines

Distance

Spanned

HX1[3:0]

VX1[3:0]

One PLC

HX1[7:4]

VX1[7:4]

One PLC

HX4[3:0]

VX4[3:0]

Four PLCs

HX4[7:4]

VX4[7:4]

Four PLCs

HXL[3:0]

VXL[3:0]

PLC Array

HXH[3:0]

VXH[3:0]

1/2 PLC Array

CKL, CKR

CKT, CKB

PLC Array

PROGRAMMABLE

FUNCTION UNIT

DIRECT[4:0]

HX4[7:4]

HX1[7:4]

DIRECT[4:0]

HXH[3:0]

HX1[3:0]

DIRECT[4:0]

HX4[3:0]

HXL[3:0]

CKL, CKR

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