Serial Parallel Shift Register 8 Bit
Let’s take a closer look at parallel-in/ serial-out shift registers available as integrated circuits. SN74ALS166 parallel-in/ serial-out 8-bit shift register. Hi, I want to create a 10 bit parallel in serial out shift register in multisim 12. How can I do it? My real aim is to create a Parallel to Serial.
Serial-In Parallel-Out Shift Register - 8-Bit Description: The 74HC595 is an 8-stage serial shift registers with a storage register and 3-state outputs. The registers have separate clocks. Data is shifted on the positive-going transitions of the shift register clock input (SHCP). The data in each register is transferred to the storage register on a positive-going transition of the storage register clock input (STCP). If both clocks are connected together, the shift register will always be one clock pulse ahead of the storage register. The shift register has a serial input (DS) and a serial standard output (Q7S) for cascading. It is also provided with asynchronous reset (active LOW) for all 8 shift register stages.
8 Bit Parallel In Serial Out Shift Register
The storage register has 8 parallel 3-state bus driver outputs. Data in the storage register appears at the output whenever the output enable input (OE) is LOW. Features:. 8-bit serial input.
8-bit serial or parallel output. Storage register with 3-state outputs. Shift register with direct clear. 100 MHz (typical) shift out frequency Applications:. Serial-to-parallel data conversion. Remote control holding register Resources:.
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What is the basic logic element that makes up a shift register? How are they connected together to provide parallel input, serial input, shifting operation, parallel output, and serial output?
When you're creating a new device in a simulator or using an FPGA, it's helpful to look at existing devices (e.g. 74xx165, 74xx595) to see how they are implemented, but only so you can understand the internal parts of the device and how they work together to produce the specified behaviour for the device. Once you understand that, you can design your shift register using the same arrangement, duplicated the number of times you want. If you were designing a circuit to be built from existing devices, then you would need to worry about how to add blocks to the 165 or 595 (or whatever device you based your design around) to extend the number of bits. But in this case, it's simpler to break that device down into its component parts and reassemble a whole new 'device' that does exactly what you want. You already have serial output; all you need is parallel input. A simple way to add parallel input is to use the set and reset inputs of the flip-flops.
You need to add a single parallel load signal, and a parallel data input for each flip-flop. Your logic needs to take these input signals and generate a set and reset signal for each flip-flop.
When the parallel load signal is inactive, the set and reset signals to the flip-flops are held inactive. When the parallel load signal is active, each flip-flop is either set or reset depending on the state of its parallel data input.