Post-layout simulations in 1.8V with HSPICE indicate a write time of 1.7ns and a read time of 1.32ns. The power dissipation is 70mW for all 9 ports at 500MHz.
The poor performance of serial communication has been an issue in the industry for a while,and FT245BM chip can exchange the protocols between USB ports and parallel ports. This papers introduces the basic principles and functions of the FT245BM chip, and also presents the application design based on FT245BM interface circuit, the assembler based on 89C52, and the source code of c51 single chip microprocessor.
A principle of designing realizable precision interfaces between sensors and digital ports of microcontrollers and microconverters which enable one not only to measure a physical variable but also to estimate its derivative was proposed.
The sensor is inserted in a vacuum chamber; the rotating mechanism of the sensor and location of the ports in the facility enables measurements along the plasma column.
It is proposed that the compact neutron cameras be placed inside the shielding blocks located in the equatorial (nine collimators) and diverter diagnostic (seven collimators) ITER ports.
The access dependence and access conflict are the key problems to solve in the design of multiport memory of vector computers. This article analyses the problems of the access dependence and access conflict of multi port memory with four ports on cross accessing mode in a single processor system and advances a technique to solve these problems.
The linking principle of linear feedback shift registers(LFSR’s)on GF(2)in Galois domain is described in the paper.To meet the test requirement,for circuits with different input ports,a technique has been developed to compose high-degree LFSR’s with lower-degree LFSR’s. Results from initial experiments show that an 8~24 degree LFSR can be formed by linking 1~7 degree LFSR’s.
This paper introduces a design of multi-state display by incorporating three I/O ports and a group of LED digital display into 8031 single-chip microcomputer system and its improved serial port display.This design is especially suitable for use in the case of multi-object monitoring,comprehensive display with less digits and lessreal-time requirement,and thereby the equipment effectiveness is much improved.