Designing A Slicecard; Power; Signal I/O - XMOS sliceKIT Hardware Manual

4 Designing a sliceCARD

IN TH I S C H A P T ER

Power

Signal I/O

sliceCARD form factors
Connector pinouts
4.1 Power
sliceCARDs have two power supplies available to them, 5V and 3V3. The 5V supply
can range from 4.75V to 5.25V (5%) at a current of up to 0.25A per slice. The 3V3
supply can range from 3.13V to 3.47V (5%) at a current of up to 0.25A per slice.
4.2 Signal I/O
A single sliceCARD connector has 36 contacts. The four types of slice have a
number of common pins which are described below.
GND: Power supply ground.
5V: 5V power supply input.
3V3: 3.3V power supply input.
NC: Not connected.
CLK: System clock input, 25MHz.
RST_N: System reset input, active low. Push-pull drive.
The other available pins are connected to xCORE processor I/Os as shown in the
pinout tables.
sliceCARDs can take their power from either 5V or 3V3 or both, but they should
draw no more than 250mA from each supply.
At system power-on, the 5V supply will power up first, followed by the 3V3 supply.
The system reset signal will de-assert a short time after this.
Due to the constraints on the sliceKIT core board, there are some ports on the
sliceCARDs which should be used in preference to others. These constraints are as
follows:
X0D4-7 can be selected for use as the xSCOPE xCONNECT Link
REV A