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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.〔Standard VITA 17-199x, VMEbus International Trade Association (VITA), http://www.vita.com/〕 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 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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Front Panel Data Port」の詳細全文を読む スポンサード リンク
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