Front Panel Data Port - Wikipedia

The front panel data port (FPDP) is a bus that provides high speed data transfer between two or more VMEbus boards at up to 160 Mbit/s with low latency. The FPDP bus uses a 32-bit parallel synchronous bus wired with an 80-conductor ribbon cable.[1]

The following interface functions are supported:[2]

• FPDP/TM (transmitter master) - drives data and timing signals onto the FPDP, and also terminates the bus signals at one end of the ribbon cable
• FPDP/RM (receiver master) - receives data from the FPDP synchronously with the timing signals provided by the FPDP/TM, and also terminates the bus at the opposite end of the cable to the FPDP/TM
• FPDP/R (receiver) - receives data from the FPDP synchronously with the timing signals provided by the FPDP/TM; it does not terminate the bus. More than one FPDP/R can be connected to the FPDP bus. It can also be an alternate function to that of FPDP/RM via software control.

The connector, denoted by the FPDP specification, is a KEL P/N 8825E-080-175.

Interface signals

• D<31:0> : Data bus driven by FPDP/TM
• DIR_n  : Active low Direction signal driven by FPDP/TM
• DVALID_n: Active low data valid indication driven by FPDP/TM
• STROBE  : A free running clock supplied by FPDP/TM
• NRDY_n  : Active low not ready signal driven by FPDP/R or FPDP/RM. Asserted before the commencement of transfer of data by the FPDP/R or FPDP/RM asynchronous to STROBE.
• PSTROBE : Optional Differential PECL version of the STROBE driven by FPDP/TM
• SUSPEND_n : Active low suspend signal asserted by FPDP/R or FPDP/RM asynchronous to STROBE to inform the transmitter that buffer flow condition may occur. The transmitter may delay not more than 16 clocks before it suspends the data transfer.
• SYNC_n  : Active low synchronization pulse provided by FPDP/TM.
• PIO1, PIO2 : Programmable I/O lines for user purposes

Data frames

The following types of data frames are supported:

• Unframed Data
• single frame Data
• Fixed size Repeating Frame Data
• Dynamic Size Repeating Frame Data

Cable length

FPDP interfaces work with up to a cable length of 1 meter when used in multi-drop configuration. They work up to 2 meter when using STROBE signal during point-to-point configuration. They work up to 5 meter when used with PSTROBE differential signal during point-to-point configuration.

See also

• VMEbus - a computer bus standard widely used for many applications and standardized by the IEC as ANSI/IEEE 1014-1987
• Serial FPDP - High-speed serial version of FPDP, that can be sent short distances over copper cables, or longer distances over optical fiber cable.

References

1. ^ Standard VITA 17-199x, VMEbus International Trade Association (VITA), http://www.vita.com/
2. ^ http://www.mc.com/uploadedFiles/Echotek_Series-FPDP-PMC-ds.pdf [bare URL PDF]

v t e Technical and de facto standards for wired computer buses
General	System bus Front-side bus Back-side bus Daisy chain Control bus Address bus Bus contention Bus mastering Network on a chip Plug and play Double data rate Quad data rate List of bus bandwidths
Standards	SS-50 bus S-100 bus Multibus Unibus VAXBI MBus STD Bus SMBus Q-Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS VPX NuBus TURBOchannel MCA SBus VLB HP GSC bus InfiniBand Ethernet UPA PCI PCI Extended (PCI-X) PXI PCI Express (PCIe) AGP Compute Express Link (CXL) Direct Media Interface (DMI) RapidIO Intel QuickPath Interconnect NVLink HyperTransport Infinity Fabric Intel Ultra Path Interconnect Coherent Accelerator Processor Interface (CAPI) SpaceWire
Storage	ST-506 ESDI SDI IPI SMD Floppy connector Parallel ATA (PATA) Bus and Tag DSSI HIPPI Serial ATA (SATA) SCSI Parallel SAS ESCON Fibre Channel SSA SATAe PCI Express (via AHCI or NVMe logical device interface)
Peripheral	Apple Desktop Bus Atari SIO DCB Commodore bus HP-IL HIL MIDI RS-232 RS-422 RS-423 RS-485 Lightning DMX512-A IEEE-488 (GPIB) IEEE-1284 (parallel port) IEEE-1394 (FireWire) UNI/O 1-Wire I²C (ACCESS.bus, PMBus, SMBus) I3C SPI D²B Parallel SCSI Profibus USB Camera Link External PCIe Thunderbolt CAN bus
Audio	ADAT Lightpipe AES3 Intel HD Audio I2S MADI McASP S/PDIF TOSLINK
Portable	PC Card ExpressCard
Embedded	Multidrop bus CoreConnect AMBA (AXI) Wishbone SLIMbus
Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest. Category

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