PMC-XM-DIFF
PMC Compatible Reprogrammable Logic with LVDS and-or RS-485 differential IO "DIFF"






Do you need to develop your own Xilinx implementation and prefer to use a COTS solution for the board? PMC-XM-DIFF is part of a family of user defined, reprogrammable FPGA based designs from Dynamic Engineering. PMC-XM-DIFF is designed to support clients who need to control the FPGA and their application uses differential IO. The IO is defined with transceivers using an SO8 package with multiple common footprint devices allowing for RS-485 and LVDS. Each IO has a separate Direction line and a dedicated analog switch to allow for termination control.

Each IO are resistor isolated from the front and rear connectors to allow front or rear operation without creating bus stubs. Each of the differential pairs is properly matched and impedance controlled. All of the IO to the front or rear panels are also matched against each other for "no skew" other than that introduced by the system cabling and active devices. 34 differential pairs are available at the front panel and/or 32 at Pn4.

The transceivers are interconnected with the Virtex FPGA to allow user control over the IO. The user FPGA [Virtex XC4VSX35] is supported on many levels to make the user design implementation as easy as possible. FLASH is supplied along with a JTAG programming method to implement auto loading applications or for a default initialization of the Virtex. The Virtex can also be loaded [or over-written] using software.

The base design includes the PCI interface with DMA. The Spartan III FPGA implements the board level decoding to allow control over the loading of the Virtex, DMA into and out of the board, memory to support DMA, and an arbitration unit to allow multiple DMA channels to be implemented. The Virtex device is further supported by a 1M x 36 QDR SRAM, PLL, Digital Temperature Sensor. Four LED´s are supplied to the Virtex to provide design status, debugging support and other user purposes.

The Xilinx Virtex FPGA has the right combination of speed, space, memory, and features to implement many embedded projects. A summary of the XCVSX35 capabilities:
8 DCM [Digital Clock Manager] used for clock control, synthesis, phase shifting.
4 PMCD : Phase Matched Clock Divider
32 Clock Buffers: multiple external and internal sources can be routed with low skew buffers
192 blocks of Block RAM : each 18 Kbits
192 Extreme DSP slices: each with 18x18 multiplier, adder, and accumlator
Additional 240 Kbits of distributed RAM
34,560 Logic Cells

To make integration easy an engineering kit is available. The engineering kit has a base "footprint", written in VHDL. A windows® driver is also part of the engineering kit. Frequently clients ask Dynamic Engineering to do the initial programming for their project and then deliver a custom engineering kit with the initial implementation, custom driver and manuals to them. In this state the client can do the maintenance or add features while taking advantage of Dynamic Engineering´s expertise and familiarity with PMC-XM-DIFF.

The VHDL defined design can have any type of interface that the user wants. In the BiSerial version of the design Dynamic Engineering has implemented Manchester, Miller, Telemetry, specialized command/control, UART, SDLC and other protocols. Any of the BiSerial designs can be ported to the PMC-XM-DIFF as part of a custom implementation for your requirements. Alternatively you can implement or port existing design work to the PMC-XM-DIFF. The channelized architecture isolates the IO control from the bus control making it easy to port design work in or out.

DMA can be used to move data from the system memory to local storage within the FPGA and vice-versa. The PCI bus is 32/33 universal voltage. The interconnection between the PCI FPGA and the user FPGA is also 32 bits and operates at 33 MHz. Two channels of TX and two channels of RX DMA are supported plus standard PCI target accesses. An arbiter within the PCI FPGA takes care of monitoring the local bus between the two FPGAs. The channels have status bits used to communicate that the channel is ready to be read or loaded for DMA. There are 8 address bits for 256 x32 of register memory decoded from the PCI space. In addition there are 10 "spare" lines which could be used for address expansion or other custom purposes.

Please note PMC-XM-DIFF can be used with a PMC carrier to adapt to PCI, PCIe, cPCI, VME and other situations. For your convenience; Dynamic Engineering has many PMC carriers.

PMC-XM-DIFF Block Diagram



PMC-XM-DIFF Features

  • Size
    		•  Standard Single PMC

  • Temperature Sensor
    		•  13 bit, one degree C I2C interface temperature sensor can be read for a local temperature. Attached to Virtex device.

  • Memory
    		•  1M x 36 QDR SRAM provided attached to Virtex. Additional internal Block RAM used for FIFO´s to support DMA transfers.

  • Clocking
    		•  Two programmable PLL reference clocks are provided for the Virtex. A reference oscillator is provided. The standard frequency is 40 MHz. Other frequencies are available by request. A 2X copy of the PCI clock is used for the inter-FPGA bus. The 66 MHz can be used as a reference.

  • IO
    		•  Bezel and or Pn4 IO options. 34/32 Differential transceivers with LVDS or RS-485 installed. Each IO has separate Direction and Termination control. Matched length impedance controlled routing.

  • LED
    		•  4 LED´s controlled by the Virtex are provided. The LED´s can be used for development or user applications.

  • PCI Speed
    		•  Standard 33 MHz. operation

  • PCI Access Width
    		•  Standard 32 bit operation supported.

  • Software Interface
    		•  PMC registers are read-writeable. Base driver has support for reference design registers within Virtex and a "generic" capability to communicate with user defined registers and memory.

  • Interrupts
    		•  Status can be polled for non-interrupt driven operation. User defined interrupts supported.

  • Power
    		•  +5 and 3.3 required. 2.5V, 1.8V, and 1.2V converted with on-board switching regulators.

  • DIP switch
    		•  An 8 position switch is attached to the base FPGA to allow for configuration control, addressing multiple cards, or to facilitate debugging




    PMC XM Benefits

  • Speed
    		•  PMC-XM-DIFF is optimized for IO interfacing requirements. The FIFO memories and programmable interrupts off-load the CPU from most of the management. Independent DMA channels further reduce CPU overhead when multiple streams are in use. The FIFO access is optimized for the PCI bus further reducing overhead by speeding up the data transfer. On the IO side, PMC-XM-DIFF has independent and interconnected channel functions. With LVDS - 200+ MHz IO and with RS-485 up to 40 MHz. When combined the 3.3V RS-485 devices have a lower IO rate of 17 MHz.

  • Price
    		•  PMC-XM-DIFF is available off-the-shelf at a reasonable price. Custom versions can also be arranged. PMC-XM-DIFF is easily programmed to implement new functions. Previously implemented "custom designs" are available without the costs of schematic level design, layout, debugging etc. A modified PMC-XM-DIFF will represent a large cost and time savings in your budget.

  • Ease of Use
    		•  PMC-XM-DIFF is easy to use. Point and shoot - just fill the FIFO and set the start bit to get your custom protocol transmitting. Built in loop-back capabilities and engineering kit helps with integration into your system. Windows driver available. Linux available upon request.

  • Availability
    		•  Dynamic Engineering works to keep the PMC-XM-DIFF in stock. Send in your order and in most cases have your hardware the next day. With a custom design a 1-2 week design period is usually required. We can support immediately with the std version then the FLASH later to help get your project going - or you can do the design yourself and start now. The manuals are located at the bottom of this page.

  • Size
    		•  PMC-XM-DIFF is a standard single width PMC card and meets the PMC mechanical specifications. PMC-XM-DIFF can be used in all PMC slots.

  • PMC Compatibility
    		•  PMC-XM-DIFF is PMC compliant per the IEEE 1386 specification.

  • PCI Compatibility
    		•  PMC-XM-DIFF is PCI compliant. You can develop with a PCI to PMC adapter - PCI2PMC or PCIBPMC.



    Ordering Information
    1 year warranty
    Quantity discounts available
    PMC-XM-DIFF - Standard version with Virtex SX35, PLL, 1Mx36 RAM, DMA
    -NR - Remove RAM from board for cost savings.
    -ROHS - Add ROHS processing - standard is leaded solder
    -485 - Add RS-485 IO in all positions - exclusive of -LVDS option
    -LVDS - Add LVDS IO in all positions - exclusive of -485 option
    -CC - Add conformal coating to board

    Engineering Kits
    Dynamic Engineering provides Engineering Kits to help our customers have a successful and quick integration. Engineering Kits will save time and money with decreased T&I. We recognize that different customers have different needs. The Engineering Kits are standardized in description to help with selection. The kits are segmented to allow for customers who only need hardware support, software support or a mixture. The Engineering Kit is highly recommended for first time buyers. The kit pricing is discounted to encourage their use.

    PMC-XM-DIFF-Eng-1 .......... Hardware Support Engineering Kit includes:
    Board level Schematics [PDF], VHDL base design for Virtex

    PMC-XM-DIFF-Eng-2 .......... Hardware Support plus Driver Engineering Kit includes:
    Board level Schematics [PDF], Software[Driver and sample application ], and VHDL reference

    PMC-XM-DIFF Drivers.......... Software Support Only Windows®XP and 2000 compliant drivers for the PMC-XM-DIFF:
    Driver and user application.


    PMC-XM-DIFF PMC Compatible Reprogrammable Logic with Transition Module "XM"
    Rear View - XM version shown.



    Manuals
    You must have Adobe Acrobat to read our PDF files.
    PMC-XM-DIFF Hardware Manual Hardware level design description, bit maps, pinouts, operation etc.
    PMC-XM-DIFF Software Manual User Driver manual for installation and use


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    Custom, IP, PMC, PC*MIP, PCI, VME Hardware, Software designed to your requirements



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