What is burst length and burst size in AXI?

What is burst length and burst size in AXI?

The burst length for AXI4 is defined as, Burst_Length = AxLEN[7:0] + 1, to accommodate the extended burst length of the INCR burst type in AXI4. AXI has the following rules governing the use of bursts: for wrapping bursts, the burst length must be 2, 4, 8, or 16.

What is burst transaction in AXI?

AXI is a burst-based protocol, which means that it is possible to transfer multiple data in a single transaction. We can transfer a single address on the AW channel to transfer multiple data, with associated burst width and length information.

What is burst size in AXI?

Burst length is number of data transfers for the burst like if ur burst length is 4 then the burst is 4 number of sequential data. now the burst size is like width of that each data, As per the AXI4 spec the burst size should be min of 8bits (1byte) that can be called as beat.

What is burst size in VLSI?

Burst size is the size of your data being sent, it can’t exceed the databus size, but can be lesser than that. Assuming your burst size is 32 and burst length is 4, it means, four 32-bit data will be sent as a burst.

What is wrap burst?

A wrapping burst is similar to an incrementing burst, in that the address for each transfer in the burst is an increment of the previous transfer address. However, in a wrapping burst the address wraps around to a lower address when a wrap boundary is reached.

How do you calculate burst size in AHB?

Wrap boundary or block size is determined by the Size of transfer * Beat length. Size of transfer = 2^(HSIZE) i.e = 1, for HSIZE = 0, 2 for HSIZE = 1, 4 for HSIZE = 2, 8 for HSIZE = 3….. Beat Length = 4, for WRAP4, 8 for WRAP8, and 16 for WRAP16.

What is burst length in FIFO?

Burst Length = No. of data items to be transferred = 120. There are no idle cycles in both reading and writing which means that, all the items in the burst will be written and read in consecutive clock cycles.

What is the burst length and burst size in AXI4?

Burst length is number of data transfers for the burst like if ur burst length is 4 then the burst is 4 number of sequential data. now the burst size is like width of that each data, As per the AXI4 spec the burst size should be min of 8bits (1byte) that can be called as beat. if not it comes under error strobe that is invalid strobe.

What does burst length mean?

If you are reading the spec you will see it says that burst length is the number of data transfers per burst, which they call beats. Each beat can be a number of bytes specified by burst size.

What is endending address of burst transfer in axi?

Ending address = 8196. (burst transfer crossing 8192 (4kb address boundary)) A burst transfer should not cross a 4KB address boundary in AXI, as in this case portion of the burst targets one slave, and the rest of the transfer targets the next slave which is an impractical situation.

What is the difference between axlen and axaxi4?

AXI4 extends burst length support for INCR burst type to 1 to 256 transfers and remains burst length to 1 to 16 transfers for all other burst types (FIXED and WRAP). Above definition explains that, AxLEN [3:0] = 0 means burst length is 1, same way AxLEN [7:0] = 255 means burst length is 256.