.1394-vxi Zero Slot Hardware Design Of The Explorer

As a high-speed serial bus specification , IEEE1394 not only realizes high transfer rates , but also has many benefits such as high bandwidth capacity , hot plugging and bus dynamic configuration , especially suits for high-speed computer peripherals such as scanners , and comsumer audio-video electronics , and military real time information transfer field such as strategic communication , navigation .Using IEEE 1394 for VXI control , the paper developed 1394-VXI Slot 0 Resource Manager , data transfer between computer and VXI instrument module is realized by 1394 interface ,'so improved the VXI measure system performance and lowered it's cost.1394-VXI converter is the Slot 0 Resource Manager module which realizes the interface between IEEE 13 94 bus and VXIbus . According to the function of the 1394-VXI converter , on the base of CAT Lab. UEST's the successful development of GPIB-VXI converter , the project use MC68030 as system processor , the transfer between VXIbus and local bus is realized by VIC ; the transfer between local bus and 1394bus is realized by 1394 link layer and physical layer ; VAC provides local memory and VXIbus memory mapping decode , and realizes the maste/slave interface fuction of VXIbus with VIC . Address decoding , module identification and TTLtrigger is realized by programmable circuit technology such as CPLD . On the base of 1394 OHCI register mapping and DMA engines , using 1394 asynchronous data transfer and fairness arbitration protocol , 1394bus operation fuction is realized by 1394 OHCI program developed with WinDriver .The paper introduced correlative protocol in IEEE 1394 and 1394 OHCI in detail, and emphatically discussed the hardware design and 1394 OHCI program design of the 1394-VXI converter. The hardware include VXI interface controller circuit ,1394 interface circuit, Address coding circuit, MODID circuit and TTLtrigger circuit etc . 1394 OHCI program realized the test of 1394bus configuration , the status transfer of physical layer , the transmission and reception of 1394 asynchronous packets . And some idea and experience developed by the author in the course of circuit andprogram debugging are discussed .