IC693MDL645
IC693MDL645
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IC697ACC621
IC697ACC624
IC697ACC644
IC697ACC700
IC697ACC701
IC697ACC702
IC697ACC715
IC697ACC720
IC697ACC721
IC697ACC722
IC697ACC723
IC697ACC724
IC697ACC726
IC697ACC727
IC697ACC728
IC697ACC729
IC697ACC730
IC697ACC732
IC697ACC735
IC697ACC744
IC697ACC800
IC697ACC801
IC697ACC802
IC697ACC803
IC697ACC804
IC697ACC805
IC697ACC806
IC697ACC820
IC697ACC821
IC697ACC822
IC697ACC900
IC697ADC701
IC697ADC701RR
IC697ADS701
IC697ALG230
IC697ALG230RR
IC697ALG320
IC697ALG320RR
IC697ALG440
IC697ALG440RR
IC697ALG441
IC697ALG441RR
IC697BEM711
IC697BEM711RR
IC697BEM713
IC697BEM713RR
IC697BEM715RR
IC697BEM721
IC697BEM721RR
IC697BEM731
IC697BEM731RR
IC697BEM733
IC697BEM733RR
IC697BEM741
IC697BEM741RR
IC697BEM761
IC697BEM761RR
IC697BEM763RR
IC697BEM764RR
IC697CBL700
IC697CBL709
IC697CBL803
IC697CBL811
IC697CBL826
IC697CGR772
IC697CGR935
IC697CGR935RR
IC697CHS750
IC697CHS750RR
IC697CHS770
IC697CHS771
IC697CHS782
IC697CHS782RR
IC697CHS783
IC697CHS783RR
IC697CHS790
IC697CHS790RR
IC697CHS790xSV
IC697CHS791
IC697CHS791RR
IC697CMM711
IC697CMM711RR
IC697CMM712
IC697CMM712RR
IC697CMM721
IC697CMM721RR
IC697CMM731RR
IC697CMM741
IC697CMM741RR
IC697CMM742
IC697CMM742RR
IC697CMM798RR
IC697CMM799RR
IC697CPM790
IC697CPM790RR
IC697CPM914RR
IC697CPM915RR
IC697CPM924RR
IC697CPM925RR
IC697CPU731
IC697CPU731RR
IC697CPU732RR
IC697CPU771RR
IC697CPU772RR
IC697CPU780
The General Purpose Interface Bus (GPIB) makes the interconnection of automatic test instruments have a unified standard, which greatly promotes the development of automatic test technology. The GPIB bus has the characteristics of fast parallel bus transmission speed, high effective data rate, strong driving ability, communication distance up to 20m, good anti-jamming ability and generality, up to 15 devices can be connected on the bus and the transmission speed can reach 8Mbit / s, so the GPIB controller Ip core is designed with the modularization idea, the main modules include state machine module, Data Path module and decoding circuit module. The design of the state machine module includes 8 small modules (such as source hook and receiver Hook) , each small module is programmed with VHDL language, at last, the top-level module of the state machine is designed by invoking each sub-module and schematic diagram, and is analyzed and simulated in Synplify and Quartus II. In the same way, the design of Data Path is carried out by designing each sub-module first, and then the whole design. Finally, the State Machine top-level module, Data Path top-level module and multi-line message decoding circuit module are used to design the top-level IP core of GPIB controller. After the whole IPCore design is completed, the Core is downloaded to the selected DE2 special development kit CPLD chip by JTAG download method to verify the communication settings, and then the hardware is built after the success, so as to get the real GPIB controller. GPIB bus is a 24-core parallel passive bus, which consists of 8 ground wires and 16 signal wires. The 16 signal lines are 8 data lines (DIO1 ~ DIO8) , 3 handshake lines (Dav, NRFD, NDAC) and 5 management lines (ATN, Ren, IFC, EOI, SRQ) . The data transmission adopts the two-way asynchronous transmission mode of bit parallel and byte serial. Note that GPIB uses negative logic, i. e. low level (not more than 0.8 v) is logic 1, high level (not less than 2.0 v) is logic 0[2] . The basic principle of the GPIB bus is to use the controller as the server, to control the instruments by programming and using the GPIB bus, at the same time, the instruments also use the GPIB control chip to realize the data transmission with the server, its output signal to GPIB bus accords with IEEE488 standard, thus achieves the goal of automatic control and test. The system volume is only 7070mm, power consumption is less than 5W, median filtering rate is 20F / S, JPEG compression rate is above 25F / S. It not only meets the real-time requirement of the video processing system, but also has small volume and low power consumption. Moreover, the system has good flexibility and expansibility based on FPGA.
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