Eclipse
TM
Family Data Sheet
11
Eclipse Family Data Sheet
6.0 Programmable Logic Routing
Six types of routing resources are provided, as in the QuickRAM devices: short (sometimes called
segmented) wires, dual wires, quad wires, express wires, distributed networks and defaults. Short wires
span the length of 1 logic cell, always in the vertical direction. Dual wires run horizontally and span the
length of 2 logic cells. Short and dual wires are predominantly used for local connections. They
effectively traverse one or two logic cells utilize an interconnect element to continue to the next cell or
to change direction.
Quad wires have passive link interconnect elements every fourth logic cell. As a result, these wires are
typically used to implement intermediate length or medium fan-out nets.
Express lines run the length of the programmable logic uninterrupted. Each of these lines has a higher
capacitance than a quad, dual or short wire, but less capacitance than shorter wires connected to run
the length of the device. The resistance will also be lower because the express wires don't require the use
of "pass" links. Express wires provide higher performance for long routes or high fan-out nets.
Distributed networks are described in the clock/control section. These wires span the programmable
logic, and are driven by "column clock" buffers. Each dedicated clock network pin buffer is hard wired to
a set of column clock buffers. Five global networks "global buffers" can be connected through special
purpose routing called "HSCK lines" to either a dedicated pin buffer, or any vertical routing wire
crossing it.
7.0 Global POR (Power-On Reset)
The Eclipse family of devices features a global power-on reset. This reset will be hardwired to all registers
and will reset the registers upon power-up of the device. The circuitry used to support the global POR
is similar to the power-up loading circuitry.
Figure 10: Power-On Reset
8.0 Separate Power and Logic Cell Power
To decrease the logic cell area and to eliminate the need for disable transistors in the input stage of the
logic cell, a separate power supply for the logic cells has been added to the family. This supply will be
grounded during programming and for various test modes.
VCC
Power-on
Reset
Q
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