Собираем 8-битный регистр с поддержкой трех состояний на выходах для подключения к шине данных

We've already built a four-bit register using four D-flip-flops. This time, we'll use off-the-shelf ICs implementing four-bit registers to build a larger register—an eight-bit one. To support three states, we'll use an additional IC with controlled buffers (tri-state buffers). The result is an eight-bit register ready for connection to the data bus and for reading and transmitting data via that bus.