OR2C04A datasheet(18/192 Pages) ETC

18 / 192 page

Lucent Technologies Inc.

Data Sheet

ORCA Series 2 FPGAs

June 1999

Programmable Logic Cells (continued)

5-4479p2(F)

Figure 20. 3-Statable Bidirectional Buffers

Intra-PLC Routing

The function of the intra-PLC routing resources is to

connect the PFU’s input and output ports to the routing

resources used for entry to and exit from the PLC.

These are nets for providing PFU feedback, turning

corners, or switching from one type of routing resource

to another.

PFU Input and Output Ports. There are 19 input ports

to each PFU. The PFU input ports are labeled A[4:0],

B[4:0], WD[3:0], C0, CK, LSR, CIN, and CE. The six

output ports are O[4:0] and COUT. These ports corre-

spond to those described in the PFU section.

Switching Lines. There are four sets of switching lines

in each PLC, one in each corner. Each set consists of

five switching elements, labeled SUL[4:0], SUR[4:0],

SLL[4:0], and SLR[4:0], for the upper-left, upper-right,

lower-left, and lower-right sections of the PFUs,

respectively. The switching lines connect to the PFU

inputs and outputs as well as the BIDI and BIDIH lines,

to be described later. They also connect to both the

horizontal and vertical X1 and X4 lines (inter-PLC rout-

ing resources, described below) in their specific corner.

One of the four sets of switching lines can be con-

nected to a set of switching lines in each of the four

adjacent PLCs or PICs. This allows direct routing of up

to five signals without using inter-PLC routing.

BIDI/BIDIH Lines. There are two sets of bidirectional

lines in the PLC, each set consisting of four bidirec-

tional buffers. They are designated BIDI and BIDIH and

have similar functionality. The BIDI lines are used in

conjunction with the XL lines, and the BIDIH lines are

used in conjunction with the XH lines. Each side of the

four BIDIs in the PLC is connected to a BIDI line on the

left (BL[3:0]) and on the right (BR[3:0]). These lines can

be connected to the XL lines through CIPs, with BL[3:0]

connected to the vertical XL lines and BR[3:0] con-

nected to the horizontal XL lines. Both BL[3:0] and

BR[3:0] have CIPs which connect to the switching lines.

Similarly, each side of the four BIDIHs is connected to a

BIDIH line: BLH[3:0] on the left and BRH[3:0] on the

right. These lines can also be connected to the XH

lines through CIPs, with BLH[3:0] connected to the ver-

tical XH lines and BRH[3:0] connected to the horizontal

XH lines. Both BLH[3:0] and BRH[3:0] have CIPs which

connect to the switching lines.

CIPs are also provided to connect the BIDIH and BIDIL

lines together on each side of the BIDIs. For example,

BLH3 can connect to BL3, while BRH3 can connect to

BR3.

RIGHT-LEFT BIDI

LEFT-RIGHT BIDI

UNUSED BIDI

LEFT-RIGHT BIDI

BIDI

CONTROLLER

TRI

RIGHT-LEFT BIDIH

LEFT-RIGHT BIDIH

UNUSED BIDIH

LEFT-RIGHT BIDIH

BIDIH

CONTROLLER

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