APEX20KC datasheet(22/90 Pages) ALTERA

22 / 90 page

Altera Corporation

APEX 20KC Programmable Logic Device Data Sheet

Figure 11 shows the intersection of a row and column interconnect, and

how these forms of interconnects and LEs drive each other.

Figure 11. Driving the FastTrack Interconnect

APEX 20KC devices include an enhanced interconnect structure for faster

routing of input signals with high fan-out. Column I/O pins can drive the

FastRowTM interconnect, which routes signals directly into the local

interconnect without having to drive through the MegaLAB interconnect.

The FastRow lines traverse two MegaLAB structures. Also, these pins can

drive the local interconnect directly for fast setup times. On EP20K400C

and larger devices, the FastRow interconnect drives the two MegaLAB

structures in the top left corner, the two MegaLAB structures in the two

right corner, the two MegaLAB structures in the bottom left corner, and

the two MegaLAB structures in the bottom right corner. On EP20K200C

and smaller devices, FastRow interconnect drives the two MegaLAB

structures on the top and the two MegaLAB structures on the bottom of

the device. On all devices, the FastRow interconnect drives all local

interconnect in the appropriate MegaLAB structures except the end local

interconnect on the side of the MegaLAB opposite the ESB. Pins using the

FastRow interconnect achieve a faster set-up time, as the signal does not

need to use a MegaLAB interconnect line to reach the destination LE.

Figure 12 shows the FastRow interconnect.

Row Interconnect

MegaLAB Interconnect

Column

Interconnect

Local

Interconnect

APEX20KC датащи(PDF) 22 Page - Altera Corporation