xilinx spartan 6 deserialization

    I just have 1 fast LVDS data line. I need to have 10 bits of data
in a register , every 5 clock cycles(DDR), coming from only 1
differential data line.

 Dear Gurus,

1-  Can I deserialize a 240 Mhz , LVDS, DDR input coming data using a
10:1 serdes ratio. (clk is also LVDS)
2-  I want to do it with data width = 1( D = 1), is it possible?
3-  Do I have to put delay to clk inputs. If not why is there a delay
element (IODELAY2) in xapp1064.pdf
4-  Do I have to use the pll concept. Is there any other solution?
5-  In the documentation of spartan 6 deserialization 16:1 is shown
but with a SDR rate. Can it be changed to DDR?


=================================================================

PS1:  I am using Spartan 6,  slx100, -3
PS2:  I checked xapp1064.pdf, ug381.pdf, ds162.pdf. I need more info
on IODELAY2 and ISERDES2.


best regards
Serkan

Serkan wrote:
>     I just have 1 fast LVDS data line. I need to have 10 bits of data
> in a register , every 5 clock cycles(DDR), coming from only 1
> differential data line.
> 
>  Dear Gurus,
> 
> 1-  Can I deserialize a 240 Mhz , LVDS, DDR input coming data using a
> 10:1 serdes ratio. (clk is also LVDS)

240 MHz shouldn't be a problem for the Spartan 6 pins.

> 2-  I want to do it with data width = 1( D = 1), is it possible?

What's your question? Input or Output datawidth?
 From my understanding you want a 1 bit input (240 MBit/s) deserialized 
to 10 bit (@24 MBit/s) output, right?
Don't see any reason why this shouldn't work.

> 3-  Do I have to put delay to clk inputs. If not why is there a delay
> element (IODELAY2) in xapp1064.pdf

What's the protocol you use for clock recovery/synchronization?

> 4-  Do I have to use the pll concept. Is there any other solution?

Have a look at 
http://www.missinglinkelectronics.com/files/papers/MLE-TB20091127.pdf 
and XAPP224 respectively.
You will need some reference clock, and you will have to use a PLL or 
DCM somewhere in the system, to generate the right clock(s) from that 
reference.

> 5-  In the documentation of spartan 6 deserialization 16:1 is shown
> but with a SDR rate. Can it be changed to DDR?

So again: what's the point here? I still don't get what you are trying 
to do, but you might also be interested in XAPP460,

Lorenz