The input byte to be serialized is re-parallelized in the byte signal. Reported an overview of the parallel to serial converter VHDL code. The serial to parallel conversion is identified by the signal byte in figure. In the testbench is used a serial to parallel converter to verify the serialization. It depends on the convention you are using. First serial output bit is the MSB of the input parallel data. #Eight bit double buffered parallel to serial converter. code#In Figure4 is reported a simulation of the parallel to serial converter VHDL code above. The clock is set to 10 ns, so 80 ns mean 8 clock cycles. In the simulation of all the figures below, It is clear that the FIFO depth shall be sized depending on the input data timing and, in any cases, the input data rate shall be less than or, at least, equal to the output serial data rate as in equation EQ1 ParallelDataRate <= SerialDataRate * N EQ1 Parallel to serial converter VHDL simulation results The read fifo logic will enable the read fifo data each 1/N clock cycles. If you need to handle different input timing you can implement a simple input FIFO logic in order to buffer the incoming parallel data. I mean, if the parallel data is not yet totally serialized, no other input data can be processed. The error detection logic rises the “ o_error_serialize_pulse” if the input data enable is high during the serialization process. In the VHDL code is implemented an error detection logic. Signal r_data : std_logic_vector(G_N-1 downto 0) O_error_serialize_pulse : out std_logic) I_data : in std_logic_vector(G_N-1 downto 0) Figure 2 Parallel to Serial conversion exampleĪn example of Parallel to Serial converter The serializer section takes N clock cycles to output the serial data stream. The parallel input to the module shall be at a rate of less than or equal to 1/N clock cycles. Let assume the parallel data bus of the Parallel to Serial converter to be N bit. Parallel to Serial converter VHDL code example If you need to transfer 16-bit data 1MHz the serial data stream speed shall be at least greater than 16 x 1 MHz = 16 MHz. Same data rate you need to use a higher speed in data transfer. Figure 1 FPGA connection Parallel vs SerialĬould be to serialize the parallel data using less connection. As you can see, these are a lot of wires! Moreover, a skew between the bits in the parallel data bus can affect the connection integrity. For instance, if we need to transfer a data bus of 16 bits between twoĭifferent FPGA at a rate of 1 MHz, we need to connect at leastġ6-bit data + 1 bit enable + 1 bit clock = 18 wires running 1 MHz. They are designed to operate from single +5 V supply with ☑0 V Multiplying references for 4-quadrant outputs with up to 4 MHz bandwidth.From two different devices, the simple way is to use the minimum numbers of The AD5547/AD5557 are Dual precision, 16-/14-bit, Multiplying, low power, current-output, parallel input, digitalto-analog Converters. ♦ Two 12-Bit Multiplying DACs with Buffered Voltage Output Fast timing specifications make these DACs compatible with most microprocessors. All logic signals are level triggered and are TTL and CMOS compatible. The MX7847 has a 12-bit parallel data input, whereas the MX7837 operates with a double- Buffered 8-bit-bus interface that loads data in two write operations. #Eight bit double buffered parallel to serial converter. full#No external trims are required to achieve full 12-bit performance over the entire operating temperature range. The amplifier feedback resistor is internally connected to VOUT on the MX7847. The output amplifier is capable of developing ☑0V across a 2kΩ load. Each DAC has an output amplifier and a feedback resistor. The MX7837/MX7847 are Dual, 12-bit, Multiplying, voltage-output digital-to-analog Converters (DACs). Special functions : Rounding, Outline, Sprite, Shadow. DIsplay capability : 24Characters x 16 Line (Two line VRAM buffer) Character display size : Large, Medium, Small Character size : 12 dots(X) x 16 dots(Y) Number of characters : 512 (6 characters are reserved for IC test) Timer/Counter : 8Bit x 4ch (16bit x 2ch) 1,536 Bytes of On-chip Data RAM (Included 256 bytes stack memory).The GMS81C4040/GMS87C4060 provides the following standard features: 40K(60K) bytes of ROM, 1,536 bytes of RAM, 8-bit timer/counter. #Eight bit double buffered parallel to serial converter. tv#The HYUNDAI’s GMS81C4040/GMS87C4060 is a powerful microcontroller which provides a highly flexible and cost effective solution to many TV applications. The GMS81C4040/GMS87C4060 is an advanced CMOS 8-bit microcontroller with 40K(60K) bytes of ROM.
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