Front Panel Data Port

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 MB/sec 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 form 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

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 Network on a chip Plug and play List of bus bandwidths
Standards	SS-50 bus S-100 bus 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 NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus InfiniBand UPA PCI Extended (PCI-X) AGP PCI Express (PCIe) Direct Media Interface (DMI) RapidIO Intel QuickPath Interconnect HyperTransport
Storage	ST-506 ESDI SMD Parallel ATA (PATA) SSA DSSI HIPPI Serial ATA (SATA) eSATA eSATAp mSATA SCSI Parallel SCSI SAS Fibre Channel SATA Express M.2
Peripheral	Apple Desktop Bus HIL MIDI Multibus RS-232 RS-422 RS-423 RS-485 DMX512-A IEEE-488 (GPIB) IEEE-1284 (parallel port) UNI/O ACCESS.bus 1-Wire D²B I²C SPI Parallel SCSI Profibus USB IEEE 1394 (FireWire) Camera Link External PCIe Thunderbolt
Audio	ADAT Lightpipe AES3 Intel HD Audio I²S MADI McASP S/PDIF TOSLINK
Portable	PC Card ExpressCard
Embedded	Multidrop bus CoreConnect AMBA Wishbone
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