The front panel data port (FPDP) is a
bus
A bus (contracted from omnibus, with variants multibus, motorbus, autobus, etc.) is a road vehicle that carries significantly more passengers than an average car or van. It is most commonly used in public transport, but is also in use for cha ...
that provides high speed data transfer between two or more
VMEbus
VMEbus (Versa Module Europa or Versa Module Eurocard bus) is a computer bus standard, originally developed for the Motorola 68000 line of CPUs, but later widely used for many applications and standardized by the IEC as ANSI/IEEE 1014-1987. I ...
boards at up to 160 Mbit/s with low latency. The FPDP bus uses a
32-bit
In computer architecture, 32-bit computing refers to computer systems with a processor, memory, and other major system components that operate on data in 32-bit units. Compared to smaller bit widths, 32-bit computers can perform large calculation ...
parallel synchronous bus wired with an 80-conductor
ribbon cable
A ribbon cable (also known as multi-wire planar cable) is a cable with many conducting wires running parallel to each other on the same flat plane. As a result, the cable is wide and flat. Its name comes from its resemblance to a piece of ribb ...
.
The following interface functions are supported:
[http://www.mc.com/uploadedFiles/Echotek_Series-FPDP-PMC-ds.pdf ]
*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
VMEbus (Versa Module Europa or Versa Module Eurocard bus) is a computer bus standard, originally developed for the Motorola 68000 line of CPUs, but later widely used for many applications and standardized by the IEC as ANSI/IEEE 1014-1987. I ...
- 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
A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable, but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with ...
.
References
Computer buses
Digital electronics
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