Powering the XEM6310
The XEM6310 requires that this supply be clean, filtered, and within the range of 4.5v to 5.5v. This supply must be delivered through the +VDC pins on the device’s expansion connectors or the DC power connector. The DC power connector on the XEM6310 is part number PJ-102AH from CUI, Inc. It is a standard “canon-style” 2.1mm / 5.5mm jack. The outer ring is connected to DGND. The center pin is connected to +VDC.
The expansion bus has several power supply pins, described below:
• +VDC is provided by an external device to the XEM6310. It must be a clean, filtered supply within the range of +4.5 volts and +5.5 volts.
• +3.3v is the output of a 2-Amp switching regulator on the XEM6310.
• +1.8v is the output of a 2-Amp switching regulator on the XEM6310.
• +1.2v is the output of a 2-Amp switching regulator on the XEM6310.
• +VCCO0 is the bank-0 I/O voltage to the FPGA. Factory default is +3.3v
• +VCCO1 is the bank-1 I/O voltage to the FPGA. Factory default is +3.3v
Supply Heat Dissipation (IMPORTANT!!)
Due to the limited area available on the small form-factor of the XEM6310 and the density of logic provided, heat dissipation may be a concern. This depends entirely on the end application and cannot be predicted in advance by Opal Kelly. Heat sinks may be required on any of the devices on the XEM6310. Of primary focus should be the FPGA (U5) and SDRAM (U7). Although the switching supplies are high-efficiency, they are very compact and consume a small amount of PCB area for the current they can provide.
If you plan to put the XEM6310 in an enclosure, be sure to consider heat dissipation in your design.
Power Supply
The XEM6310 is designed to be operated from a 5-volt power source supplied through the DC power jack on the device or the expansion connectors on the bottom of the device. This provides power for the three high-efficiency switching regulators on-board to provide 3.3 V, 1.8 V and 1.2 V. 0.9 V is derived from the 3.3-V supply using a small low-dropout (LDO) regulator for use as a DDR2 termination voltage. Each of the three switching regulators can provide up to 2 A of current.
DC Power Connector
The DC power connector on the XEM6310 is part number PJ-102AH from CUI, Inc. It is a standard “canon-style” 2.1mm / 5.5mm jack. The outer ring is connected to DGND. The center pin is connected to +VDC.
Power Budget
The table below can help you determine your power budget for each supply rail on the XEM6310. All values are highly dependent on the application, speed, usage, and so on. Entries we have made are based on typical values presented in component datasheets or approximations based on Xilinx power estimator results. Shaded boxes represent unconnected rails to a particular component. Empty boxes represent data that the user must provide based on power estimates.
The user may also need to adjust parameters we have already estimated (such as FPGA Vcco values) where appropriate.
| COMPONENT(S) | 1.2V | 1.8V | 3.3V |
|---|---|---|---|
| 100 MHz | 150 mW | ||
| DDR2 | 600 mW | 250 mW | |
| FPGA Vccint | |||
| FPGA Vccaux | 250 mW | ||
| FPGA Vcco3 (DDR2), est. | 250 mW | ||
| FPGA Vcco2 (USB), est. | 250 mW | ||
| FPGA Vcco0,1 | |||
| Total | |||
| Available | 2,400 mW | 3,600 mW | 6,600 mW |
Example XEM6310-LX150 FPGA Power Consumption
XPower Estimator version 12.3 was used to compute the following power estimates for the Vccint supply. These are simply estimates; your design requirements may vary considerably. The numbers below indicate approximately 70% to 80% utilization.
| COMPONENT | PARAMETERS | VCCINT |
|---|---|---|
| Clock | 150 MHz GCLK – 70,000 fanout | 384 mW |
| Clock | 100 MHz GCLK – 70,000 fanout | 256 mW |
| Logic (DFF) | 150 MHz, 70,000 DFFs | 380 mW |
| Logic (DFF) | 100 MHz, 70,000 DFFs | 232 mW |
| Logic (LUT) | 150 MHz, 32,000 Combinatorial, 1,000 SR, 1,000 RAM | 287 mW |
| Logic (LUT) | 100 MHz, 32,000 Combinatorial, 1,000 SR, 1,000 RAM | 191 mW |
| BRAM | 18-bit, 100 @ 150 MHz, 100 @ 100 MHz | 237 mW |
| DSP | 150 MHz, 140 slices | 78 mW |
| MCB | 150 MHz | 85 mW |
| Misc. | DCM, PLL, etc. | 100 mW |
| Total | 2,230 mW | |
| Available | 2,400 mW |