The cross-point is intended for ATD multiplexing digital information in the form of packets of fixed lengths between two buses (A-B and C-D); it is constituted by: a first shift register (RAB), a first buffer register (RTE), a RAM (MRAM), a second buffer register (RTS), a second shift register (RCD),...http://www.google.com.tw/patents/US5033045?utm_source=gb-gplus-share專利 US5033045 - Circuit element - cross-point between two bus lines
