When the ROM is used, since its address decoder is fixed, the function cannot be simplified, thereby occupying more area of ​​the ROM chip. To solve this problem, we use a device that can simplify the function - PLA
PLA
The PLA is a logic device that can be programmed. It can program logic "and", "or" arrays, and use PLA to easily implement combinatorial logic and timing logic.
Example: 1 Implementing a binary full adder with PLA The simplest logical expression of the full adder is (see Chapter 4, Section 3):
S=ABCi-1+ABCi-1+ABCi-1+ABCi-1
Ci=AB+ACi-1+BCi-1
There are seven product terms in the formula, which are:
P0=ABCi-1 P1=ABCi-1 P2=ABCi-1 P3=ABCi-1
P4=AB P5=ACi-1 P6=BCi-1
According to the above, it can be concluded that the array structure diagram of the PLA full adder is as shown in Fig. (1).
It can be seen that PLA is equivalent to a ROM with both "and" or "array" programmable.
Bidirectional DC Power Supplies
The BPS series of bidirectional programmable power supplies are high-precision, low-ripple and fast response speed bidirectional DC Power Supplies with an all-digital signal control loop designed by iDealTek-Electronics based on IGBT high-frequency switching technology and bidirectional AC/DC topology architecture.
Different from the traditional DC power supply which only has constant voltage and constant current working modes, this series of programmable bidirectional AC DC power supplies have both power supply and load characteristics. It has multiple working modes of constant voltage, constant current, constant resistance and constant power, and can realize dual quadrant operation to allow the energy of the measured object to be fed back to the power supply. And Bidirectional AC-DC Power Supplies have built-in function generator, can freely generate arbitrary waveforms.
This Bidirectional DC Power Supplies are featured for high reliability, efficient setting function and complete protections, also supporting the requirement of parallel connection of multiple-units to achieve output power rating expansion, making this bidirectional power supply the best choice for the cutting-edge application industry for automated testing, automotive production line manufacturing testing, photovoltaic plate aging testing and various DC power supplies.
This series of bidirectional DC power supplies adopt active power factor correction technology, which is specially designed for typical 380V and 480V AC two-phase or three-phase alternating current with the rated output power ranging 5KW / 10KW / 15KW, the maximum output voltage ranges from 80V to 2000V under different rated powers, and the bidirectional power can be flexibly adjusted. It can output a higher voltage at a lower current or a higher current at a low voltage while maintaining within the maximum rated power range.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com