Actel ProASIC3/E, User Manual, Page: 11 / 106

PLL Parts/Usage on ProASIC3
ProASIC3/E Starter Kit User’s Guide and Tutorial 11
PLL Parts/Usage on ProASIC3
Instructions for PLL Activation on ProASIC3 Starter Kit Board
In order to use the PLLs on the ProASIC3 starter kit board, power must be applied to their respective analog supply
rails. For the west side PLL, known as PLF, the V
CCPLF
line must be connected to V
CC
, which is held at 1.5 V. The
same is true for V
CCPLC
of the PLL on the east side, known as PLC. In addition, the V
COMPLF
and V
COMPLC
lines
must be connected to ground. We do not connect these voltages by default on the board for three reasons:
1. The PLC analog voltage rails are not available on A3P devices, only on A3PE in the PQ208 package. Only the west
side PLL, namely PLF, is available on A3P devices in PQ208. In A3P devices, the pins are used as general I/Os. The
same board is used for A3PE and A3P devices.
2. We want to demonstrate the lowest possible power consumption for the part. Perpetually powering the PLL lines
would not achieve that.
3. It is easy to connect the appropriate pins together when desired. That is why we make the pins available on the
headers.
A variety of valid connections are possible. Two examples are as follows:
1. For PLF, connect pin 27 (V
CCPLF
) to pin 36 (V
CC
), and pin 25 (V
COMPLF
) to pin 17 (GND).
2. For PLC, (A3PE only) connect pin 131 (V
CCPLC
) to pin 142 (V
CC
), and pin 133 (V
COMPLC
) to pin 141 (GND).
To facilitate end users, we will be supplying jumper wires with selected production versions of the kit to allow end users
to quickly connect and disconnect these voltage supply rails. If a user has lost the jumper wires or has a production kit
without jumper wires, it is a simple matter of soldering short insulated connecting wire to the appropriate header pins on
the J14A and J14C headers.
Power Supplies
A 9 V power supply is provided with the kit ( Figure 2-2 ). There are many power supply components in the starter kit
board to illustrate the many ways that differing voltage banks may be supported with ProASIC3 and ProASIC3E