|FMC LPC Breakout DS#T0003 REV 2018/10/30 PDF version (coming soon), HTML version|
|Breakout board for Low-Pin CountFPGA Mezzanine Cards|
The photos below show the bottom side with LPC mezzanine card connector (MC-LPC-10) and top side with LPC carrier card connector (CC-LPC-10).
The FMC LPC Breakout board is a passive adapter for accessing all signals of ANSI/VITA 57.1 FPGA Mezzanine Card (FMC) Standard compliant low-pin count (LPC) connectors. All pins of the connector's rows C, D, G, and H are routed to a separate pad array on the top and bottom side. These pads were placed at a 1.27 mm pitch to easily attach additional probes or solder wires. For special measuring tasks or for use as a stand-alone carrier, the power pins of the connector were routed to additional vias in the back of the module. Furthermore, simple electrical circuits can be realized on the prototyping area, which is a field of non connected vias with a pitch of 2.54 mm. The FPGA mezzanine card has commercial grade form factor (single width, 78.80 mm x 69 mm) and is designed for air cooling.
|2. Application information
The FMC LPC Breakout module is predestined for three typical applications:
1. Passive FMC module The board can be used as a passive FMC module or breadboard. Functionality must be realised by external circuitry on the prototyping area. Fig. 1: FMC LPC Breakout module plugged on carrier board (Digilent Nexys Video™ Board, 410-316).
2. Simple FMC carrier The module can also be used as simple FMC carrier board. This card cannot be used to implement a whole application, but basic functions can be provided. For example, the correct behavior of an attached FMC module can be verified by providing an external power supply through the FMC LPC Breakout board. Or even a simple I2C programmer and reader for a FRU (field replaceable unit) record can be implemented with this carrier board as a basis.
3. Test point insertion (stacked assembly) The most reasonable application of the module is probably its use as an external test point array for devices under test. The connectors on the top and bottom allow the stacking of at least two external FMC boards. Thus the FMC LPC Breakout module in the middle of the stack between a carrier and mezzanine card provides test points for all signals passing through the connectors. With such a configuration, a real world FMC setup can be evaluated and debugged.
4. Loopback testing For the implementation of high-speed data links with FPGAs, loopback testing is a useful method for evaluating performance of the carrier platform and verifying the FPGA design. The FMC LPC Breakout Module can be hooked up as loopback device by shorting the appropriate pins on the board. We have checked different soldered wire connections at two line rates (1350 MHz and 3375 MHz) with Xilinx IBERT core on Xilinx Artix-7 FPGA (XC7A200T-1SBG484C). All the loose cable connections from Tab. 1 were capable of transmitting pseudorandom binary sequence pattens (7-bit PRBS pattern) at the tested data rates without any errors.Tab. 1: FMC LPC Breakout Module with different soldered wire connections for shorting the loopback. The eye scans were recorded with Xilinx IBERT core for GTP transceivers on a Artix-7 FPGA (XC7A200T-1SBG484C).
General information Depending on the application, it is recommended to solder additional pin headers to the power pin array and to the breakout pad array. Standard pin headers are suitable and fit the PCB layout. Fig. 2: FMC LPC Breakout module with separate power vias and equipped pin headers (20 pos., 2.54 mm pitch).
|3. Electrical data (pin description)
The printed circuit board is open-source hardware! You can download the FMC LPC breakout board schematics and PCB layout files in their latest revision from http://www.fmchub.com. The parts list (see tab. 1) is very simple, because it consists of only two parts. Tab. 2: Parts list of the FMC LPC Breakout board.
The ANSI/VITA 57.1 FMC standard describes different power supply pins on the LPC connector. The most important are routed to a separate via row next to the FMC connector in the back of the module (see fig. 3). Fig. 3: FMC LPC Breakout board with separate power vias (2.54 mm pitch). A list of the power supply pins provided by the via row is shown in tab. 2. Tab. 3: Power pin vias and their signal names, locations, and trace widths on the PCB.
The signals from the LPC connector are routed to an array of pads (fig. 4). Fig. 4: FMC LPC Breakout board with an array of pads (1.27 mm pitch) for general purpose access to ANSI/VITA 57.1 signals. Tab. 4: Signals of the ANSI/VITA 57.1 FMC LPC connector and pad array.
Please note that all Ground pins on the FMC LPC Breakout board are not tied together. This also applies to all other pins with identical function on the connector. Traces from the LPC connector to the breakout pads have a minimum width of 0.127 mm (5 mil).
|4. Mechanical data
The board outline is defined by ANSI/VITA 57.1 standard for single width FMC modules. The board includes region 2 and region 3 of that standard. Region 1 for additional I/O connectivity with a front panel has been omitted, such that absolute board dimensions are 78.80 mm x 69 mm. Cut outs on board shape have a radius of 1 mm. Exact dimensions are given in figure 5.Fig. 5: Mechanical drawing of the FMC LPC breakout board. The mounting holes are plated but have no electrical connection. Their sizes and positions are in accordance with ANSI/VITA 57.1 single width FMC modules with commercial grade mounting (air cooled). Fig. 6: Product photo of FMC LPC breakout board (bottom view). Fig. 7: Product photo of FMC LPC breakout board (top view).
|5. Ordering information
The FMC LPC Breakout module can be ordered at various online market places, or you can request a quotation by sending an e-mail to email@example.com.
Tab. 5: Assembly variants of FMC LPC Breakout board with product numbers and market places.
|6. Document history Document number: DS#T0003 Version history: 2018/10/30: Added loopback testing results to 2. Application information 2018/08/23: Added Designspark Marketplace to 6. Ordering information 2018/03/15: Added Standard lead times to 5. Ordering information 2018/02/22: Added links for schematics and pcb files, update ordering information 2018/02/14: Minor changes (wording, formatting, etc.) 2018/02/13: Initial release|
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