receive five bytes from one-byte data bus in one clock cycle

[rakesh_aadhimoolam]

hi,
I have one byte input bus,
I want to receive 5 bytes into an array of 5 bytes in one clock cycle.
Can anyone please tell me, if it is possible to receive more than one bytes into an array of bytes in one clock cycle only.
if yes than how to write VHDL code for the same.

 

[maksya]

You can double transfer speed on the same bus using DDR (double data rate). But it is impossible to get fivefold increase of data rate without having another clock.

Lets assume that you have a standard clock (system_clock) that synchronize data transmission on your byte-wide bus. If that system_clock have period T then we have to use another clock which period = T/5.

You can use PLL blocks for frequency multiplication.

 

[han00oo]

Re: receive five bytes from one-byte data bus in one clock c

You can double transfer speed on the same bus using DDR (double data rate). But it is impossible to get fivefold increase of data rate without having another clock.

Lets assume that you have a standard clock (system_clock) that synchronize data transmission on your byte-wide bus. If that system_clock have period T then we have to use another clock which period = T/5.
.

i think it's the best way to do so & it's predefined in moduleware in VHDL tool under the name clk_div simply change the dividing ratio to 5

 

[EDALIST]

Re: receive five bytes from one-byte data bus in one clock c

I Think The Easy Solution Is To Use 40 bit Bus.

 

[yego]

Re: receive five bytes from one-byte data bus in one clock c

I'd split those 8 bits into 4-bit data bus and 4-bit nibble address bus.
On the source side I'd start transfers with address 0 for the lower nibble of the first byte.
Next I'd send the higher nibble of the first byte with the address 1, and so on.
On the receiving side I'd use those addresses to steer received data to my array.
Sensing changes in the address you can recreate the sender clock.

OR.....
You don't even need the address bus if you send the data in the fixed order.
Just use one of the address lines to transmit your sender clock.

That's it.
The question is if you can increase your bus speed fivefold.

Regards, yego