8 Bit Serial To Parallel Converter Vhdl Code For Digital Clock
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Shift register are the registers which are used to shift the stored bit in one or both directions. In this section, shift register is implemented which can be used for shifting data in both direction. Further it can be used as parallel to serial converter or serial to parallel converter. VHDL files required for this example are listed below,
Let assume the parallel data bus of the Parallel to Serial converter to be N bit. The parallel input to the module shall be at a rate of less than or equal to 1/N clock cycles. The serializer section takes N clock cycles to output the serial data stream.
In Figure4 is reported a simulation of the parallel to serial converter VHDL code above. First serial output bit is the MSB of the input parallel data. You can choose to output first the LSB. It depends on the convention you are using. In the testbench is used a serial to parallel converter to verify the serialization. The serial to parallel conversion is identified by the signal byte in figure.
In this post, we implemented a simple example of parallel to serial VHDL code. Such a conversion strategy can be used when we need to connect two different devices like two FPGA and we need to minimize the connection wires. The clock for the data connection must run at least N times faster (where N is the number of bits to serialize).
The serial to parallel decoder takes 64-bit serial input and converts it to two 8-bit parallel streams. The input of the serial to parallel decoder is the output of a 24-bit Crystal Semiconductors Stereo Analog to Digital converter (CS5360 model) in the I2S serial format. The I2S serial format contains, in sequence, a 24-bit value representing the current left channel sample, an 8-bit value representing a peak signal level (PSL) detection value for the left channel, a 24-bit value representing the current right channel sample and an 8-bit value representing a PSL detection value for the right channel. To learn more about the A/D converter used to support the A/D converter Interface the reader is referred to the application note on the ADC (CS5360).
To convert serial 64-bit data to two 8-bit parallel streams, the incoming data is shifted through a 64-bit shift register. After 64 Sclk pulses the resulting 64-bit vector of the shift register contains, in sequence, the left and right digital audio output sequences.
Shift Registers are used for data storage or for the movement of data and are therefore commonly used inside calculators or computers to store data such as two binary numbers before they are added together, or to convert the data from either a serial to parallel or parallel to serial format. The individual data latches that make up a single shift register are all driven by a common clock ( Clk ) signal making them synchronous devices.
This data is outputted one bit at a time on each clock cycle in a serial format. It is important to note that with this type of data register a clock pulse is not required to parallel load the register as it is already present, but four clock pulses are required to unload the data.
Universal shift registers are very useful digital devices. They can be configured to respond to operations that require some form of temporary memory storage or for the delay of information such as the SISO or PIPO configuration modes or transfer data from one point to another in either a serial or parallel format. Universal shift registers are frequently used in arithmetic operations to shift data to the left or right for multiplication or division.
33,280 logic cells in 5,200 slices (each slice contains 4 x 6-input LUTs (Look-up Tables) and 8 flip-flops);1,800 Kbits of fast-block RAM;five clock management tiles, each with a phase-locked loop (PLL);90 DSP slices;internal clock speeds exceeding 450 MHz;on-chip analog-to-digital converter (XADC);16-user switches;16-user LEDs;5-user pushbuttons;4-digit 7-segment display;4 Pmod connectors: 3 standard 12-pin Pmod & 1 dual-purpose XADC signal / standard Pmod;12-bit VGA output;USB-UART bridge;serial flash;Digilent USB-JTAG port for FPGA programming and communication;USB HID host for mice, keyboards, and memory sticks. 153554b96e
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