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161 Threads found on Asynchronous And Synchronous
There are no asynchronous RAMs in an FPGA is that clear enough? If you try to implement one it will either a) fail to implement, or b) end up as a huge design that implements latches in the LUT fabric to store bits.
It is because you missed a load of variables from the sensitivity list of your always block, because it is asynchronous logic. You should be using always(*) for the block, as it will be updated also on adr_i, cache, ex_missed_dat_i. I highly suggest though that you add a clocjk to the system and make the design synchronous.
If you are doing negative numbers, why are you using unsigned type? Also, why are you using all asynchronous logic constructs? why no synchronous logic, or at least, why are you not using the template? your synchronous logic descriptions will not currently synthesise, as you are creating a latch, not a register, (...)
how can i send data from master fpga to slave fpga .. what i mean is the master sends data slave catch .. slave send data master catch.. i assigned the mosi miso sck ss for the fpga master and the slave fpga in pmod connector .. what should i do next? here is top module code spi_loopback. --------------------------------------
Two clocks with integer frequency ratio n:m are not per se asynchronous. The phase is varying stepwise with a minimal launch to latch delay according to the least common multiple of both clock. It can be well manageable for 3:5, but hardly for 37:50.
Looking at the internal block diagram, there is a high side and low side switch and it look pretty similar to other asynchronous part like the ACT4524. Regularly, an asynchronous buck converter does not involve a low side switch transistor. In so far, the ACT switchers aren't regular (...)
You code won't work in hardware, there are no dual clock registers in any existing FPGA. 1. If pulse is synchronous with respect to clk, then use pulse as an enable. 2. If pulse is asynchronous wrt clk and pulse has a width that is less than the clock period, then you'll have to pulse stretch puls
What is the basic difference between asynchronous serial communication and synchronous serial communication??? synchronous data transfer: 1) sender and receiver use the same clock signal 2) supports high data transfer rate 3) needs clock signal between the sender (...)
Can you please post the testbench code and the ROM code? Is this a synchronous or asynchronous rom?
I am trying to interface PIC628A with WT32i. PIC has USART interface and WT32 has UART pins. Knowing that "synchronous mode (USART) requires both data and a clock and asynchronous mode (UART) requires only data" I concluded that I have to connect pins 8 and 9 of PIC to (...)
synchronous motors lock up to the mains frequency and can only run at one speed. asynchronous motors run at a speed determined by the load on them. Have you looked at Wikipedia? Frank
Only use it when I am doing asynchronous logic for fun and profit.
106011 I have a clock, PLL_CLK from PLL, which goes to two different modules. Each module has its own dividers. The divided clock between the module1 and module2 should be treated as synchronous or asynchronous ? Example, M1_DIV4 and M2_DIV4 are sync or async to each other ?
Hi all, what happens if we use synchronous process and asynchronous process in a design.Does it give meta stable values when implemented on board.
Hi All, I'm working on a project for one of my classes in which I get to implement a design of my choosing, and I am attempting to interface with the on-board Cellular RAM of the Nexys-3 Spartan 6 and do asynchronous and synchronous reads and display the data from the (...)
In this attached paper the asynchronous FIFO shows two resets, one for write and another for read. How to take care of two different independent resets as shown in this paper? Suppose this asynchronous FIFO is being used inside another top level design where the top level design has only one reset. How to (...)
More fundamentally, asynchronous has no reference clock, it carries the information needed to frame the data in the stream itself. This is normally a start and stop bit and to recover the data between them the transmitting and receiving systems have to work at (or close to) the same speed. (...)
I have an Atmel AT89LP6440 but no parallel programmer so I made a PC program that uses an FTDI cable in SPI mode to program it instead. This works well and I am able to both program the chip and read back the firmware. The chip uses a synchronous SPI format. Here is the code I have that works using the D2XX library in (...)
Can Xilinx ISE or Altera Quartus synthesize a design unit which uses no clock inputs whatsoever? Is it possible to simulate an asynchronous module (a microcontroller) using synchronous design tools.?? I tried the fpga synthesis of an asynchronous microcontroller (module in verilog), which very (...)
An asynchronous reset gives '0' at the output of a DFF, while an asynchronous set gives '1' at the output of a DFF. Do all FPGA's feature an asynchronous set and reset for their DFFs? Are there any devices that support only an asynchronous (...)