![]() From observation of devices that used RS-232 to receive data, I always remember seeing garbage if you hooked it up in the middle of a burst of data. I actually don't think anyone does that type of synchronization. If you pick up the channel in the middle of transmission you'll end up having to find the pattern of 10 repeating every 10 bits (8-bit data). So if the channel goes from idle to active, 0 will be the first thing you see. The RS-232 serial protocol has a start and stop bit, logic 0 and 1 respectively. EDIT: > it is nt simulating Why? Whats the problem? ![]() Draw a picture with different parallel input vectors and how the have to occur on the serial output. > 1st i got the data of 6 bit length > some other time when i get the data of length10 bit even in same way And HOW can cou see this difference of 4 bits on a 16 bit vector? How can you KNOW the witdh of the actual vector? > I think u got my point Yes, i do, but not vice versa. #8 bit parallel to serial converter ic code#Thats exactly, what my previously posted code does. > Similarly some other time when i get the data of length10 bit even in > same way that should get serialized. > For example 1st i got the data of 6 bit length at > that time that data should be latched then it should get serialized. This means our logic should be 1 time programmed instead of runtime programmable. Similarly some other time when i get the data of length10 bit even in same way that should get serialized. Ya input is fixed length of 16 bit but this parallel to serial converter logic should be programmable when ever the data will arrive then dat should get serialized.įor example 1st i got the data of 6 bit length at that time that data should be latched then it should get serialized. ALL entity P2S is port ( Serial_out: out std_logic clk: in std_logic Parallel_data: in std_logic_vector( 15 downto 0) DataReady: in std_logic) end P2S architecture Behavioral of P2S is signal OldReady: std_logic:= '0' signal Shreg: std_logic_vector( 15 downto 0) begin process (clk) begin if (clk 'event and clk = '1') then Shreg. The Arasan High Speed SPI – AHB IP Core has been widely used in different applications by major chip vendors.Library IEEE use IEEE.STD_LOGIC_1164. The Arasan High Speed SPI – AHB IP Core is an RTL design in Verilog that implements an SPI – AHB controller on an ASIC, or FPGA. The SPI controller consists of one SPI master and one SPI slave and it can be programmed by an AHB host to support the TI, Motorola, or National SPI protocol. #8 bit parallel to serial converter ic generator#The Status and Interrupt Generator provides data transaction information to the AHB host processor that reflects the FIFOs and DMA states. The device has four basic modes of operation: Hold (do nothing) Write (serially via input/output) Read (serially) Load (parallel via data. A three-state input/output (SER/Q15) port provides access for entering a serial data or reading the shift-register word in a recirculating loop. A SPI clock frequency from 500 KHz to 50 MHz can be selected. The 'LS674 is a 16-bit parallel-in, serial-out shift register. A SPI Clock Generator is included to provide adjustable input clock to the SPI controller. The AHB master consists of a DMA controller to enhance the system performance. A 32-bit x 32-bit transmit FIFO and a 32- bit x 32-bit receive FIFO serve as the data buffer to coordinate data flows between the AHB and SPI interfaces. The AHB – SPI bridge performs either parallel-to-serial conversion or serial-to-parallel conversion with a maximum throughput of 50 Mbit/sec. Both AHB and SPI support master and slave modes. The controller can be used in applications such as flash memory card and digital camera. The SPI – AHB bridge enables an AHB host to access a serial device at high-speed through the SPI interface. AHB, PCI or other custom specific buses can also be provided upon request. The I2S Controller IP supports a 32-bit parallel bus interface. The I2S Controller also includes interrupt support for reporting FIFO and other conditions. These two interfaces can be operated in two independent clock domains. The included transmit FIFO and receive FIFO handle data transfers between the I2S interface and application interface. DAC/ADC resolution is configurable from 8-bit to 32-bit. ![]() The I2S Controller IP supports 44.1KHz audio samplingrates. The Bit Clock (BLCK) and Left and Right Clock (LRCK) provide synchronization for the transmit and receive data. Each channel can be programmed as an I2S master or an I2S slave. The controller’s I2S interface consists of one transmitter and one receiver. The Arasan I2S Controller IP Core provides a 32-bit parallel processor bus as the application interface. The I2S bus is used for connecting audio components such as speakers, DACs, or audio subsystems. The Arasan I2S Controller IP Core is a two-channel I2S serial audio controller compliant to the Philips* Inter-IC Sound specification.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |