at40kal ATMEL Corporation, at40kal Datasheet - Page 16

• Manufacturer Part Number: at40kal
• Description: At40kal Military Reprogrammable Fpgas With Freeram
• Manufacturer: ATMEL Corporation

Set/Reset Scheme
The AT40KAL family reset scheme is essentially the same as the clock scheme except
that there is only one Global Reset. A dedicated Global Set/Reset bus can be driven by
any User I/O, except those used for clocking (Global Clocks or Fast Clocks). The auto-
matic placement tool will choose the reset net with the most connections to use the glo-
bal resources. You can change this by using an RSBUF component in your design to
indicate the global reset. Additional resets will use the express bus network.
The Global Set/Reset is distributed to each column of the array. Like Sector Clock mux,
there is Sector Set/Reset mux at every four cells. Each sector column of four cells is
set/reset by a Plane 5 express bus or Global Set/Reset using the Sector Set/Reset mux
(Figure 11 on page 17). The set/reset provided to each sector column of four cells is
either inverted or non-inverted using the Sector Reset mux.
The function of the Set/Reset input of a register is determined by a configuration bit in
each cell. The Set/Reset input of a register is active low (logic 0) by default. Setting or
Resetting of a register is asynchronous. Before configuration on power-up, a logic 1 (a
high) is provided by each register (i.e., all registers are set at power-up).
AT40KAL
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4263B–AERO–06/03