MPMC On EDK

Hi All ,

I am trying to interface microblaze with a Micron DDR SDRAM
(MT46V16M16FG-75 16Mx16) using MPMC from the IP catalogue. As I am
running on Spartan 3 FPGA I need to connect port lines - DDR_DQS_DIV_O
and DDR_DQS_DIV_I , else I get errors , it also states that these
should be connected in for spartan 3.

The problem is that there is not much documentation about these port
lines in the MPMC data sheet. Has anyone used this? does any one know
how to connect these lines up?

thanks in advance

BR
rate

The MPMC DDR-Interface is based on the MIG-Memory Controller. Download 
at http://www.xilinx.com/products/ipcenter/MIG.htm the "User Guide" 
(ug086.pdf). See page 331/332: Generic Memory Interface Guidelines.

Daniel



ratemonotonic schrieb:
> Hi All ,
> 
> I am trying to interface microblaze with a Micron DDR SDRAM
> (MT46V16M16FG-75 16Mx16) using MPMC from the IP catalogue. As I am
> running on Spartan 3 FPGA I need to connect port lines - DDR_DQS_DIV_O
> and DDR_DQS_DIV_I , else I get errors , it also states that these
> should be connected in for spartan 3.
> 
> The problem is that there is not much documentation about these port
> lines in the MPMC data sheet. Has anyone used this? does any one know
> how to connect these lines up?
> 
> thanks in advance
> 
> BR
> rate

On 6 Jan, 16:44, Daniel Koethe <dkoe...@nospam-web.de> wrote:
> The MPMC DDR-Interface is based on the MIG-Memory Controller. Download
> athttp://www.xilinx.com/products/ipcenter/MIG.htmthe "User Guide"
> (ug086.pdf). See page 331/332: Generic Memory Interface Guidelines.
>
> Daniel
>
> ratemonotonic schrieb:
>
> > Hi All ,
>
> > I am trying to interface microblaze with a Micron DDR SDRAM
> > (MT46V16M16FG-75 16Mx16) using MPMC from the IP catalogue. As I am
> > running on Spartan 3 FPGA I need to connect port lines - DDR_DQS_DIV_O
> > and DDR_DQS_DIV_I , else I get errors , it also states that these
> > should be connected in for spartan 3.
>
> > The problem is that there is not much documentation about these port
> > lines in the MPMC data sheet. Has anyone used this? does any one know
> > how to connect these lines up?
>
> > thanks in advance
>
> > BR
> > rate

Hi Daniel ,

Thanks for the links the doc looks good and I am going through it now.
Is the MPMC suitable to interface with asynchronous DDR SDRAMS? i.e.
the reference board I am using has Micron MT46V16M16FG-75 16Mx16 part
which takes min 75mhz clock. the microblaze on the board is running at
50 Mhz, but the board has 75Mhz clock. In the original design an OPB
DDR SBRAM controller was used in which there was seperate control for
the DDR clock inputs , but MPMC only seems to take the system clock as
an input which is my case is 50 Mhz. How do I produce an 75 Mhz DDR
clock from MPMC?

Thanks very much ,
BR
Rate

ratemonotonic schrieb:
> On 6 Jan, 16:44, Daniel Koethe <dkoe...@nospam-web.de> wrote:
>> The MPMC DDR-Interface is based on the MIG-Memory Controller. Download
>> athttp://www.xilinx.com/products/ipcenter/MIG.htmthe "User Guide"
>> (ug086.pdf). See page 331/332: Generic Memory Interface Guidelines.
>>
>> Daniel
>>
>> ratemonotonic schrieb:
>>
>>> Hi All ,
>>> I am trying to interface microblaze with a Micron DDR SDRAM
>>> (MT46V16M16FG-75 16Mx16) using MPMC from the IP catalogue. As I am
>>> running on Spartan 3 FPGA I need to connect port lines - DDR_DQS_DIV_O
>>> and DDR_DQS_DIV_I , else I get errors , it also states that these
>>> should be connected in for spartan 3.
>>> The problem is that there is not much documentation about these port
>>> lines in the MPMC data sheet. Has anyone used this? does any one know
>>> how to connect these lines up?
>>> thanks in advance
>>> BR
>>> rate
> 
> Hi Daniel ,
> 
> Thanks for the links the doc looks good and I am going through it now.
> Is the MPMC suitable to interface with asynchronous DDR SDRAMS? i.e.
> the reference board I am using has Micron MT46V16M16FG-75 16Mx16 part
> which takes min 75mhz clock. the microblaze on the board is running at
> 50 Mhz, but the board has 75Mhz clock. In the original design an OPB
> DDR SBRAM controller was used in which there was seperate control for
> the DDR clock inputs , but MPMC only seems to take the system clock as
> an input which is my case is 50 Mhz. How do I produce an 75 Mhz DDR
> clock from MPMC?

The MPMC can not produce a 75Mhz clock from a 50 Mhz source. But the 
MPMC supports 1:2 System/PIM clock and memory clock.

See at page 50 of Datasheet MPMC (DS643) near "<PIM>_Clk".

For example you have a 50Mhz source clock, use clk0 (system clock) and 
clk2x output of a DCM to produce the 100Mhz memory clock. Do not forget 
to connect clk0 and clkfb to assure zero phase offset.


> 
> Thanks very much ,
> BR
> Rate

On Jan 6, 9:25 pm, Daniel Koethe <dkoe...@nospam-web.de> wrote:
> ratemonotonic schrieb:
>
>
>
> > On 6 Jan, 16:44, Daniel Koethe <dkoe...@nospam-web.de> wrote:
> >> The MPMC DDR-Interface is based on the MIG-Memory Controller. Download
> >> athttp://www.xilinx.com/products/ipcenter/MIG.htmthe"User Guide"
> >> (ug086.pdf). See page 331/332: Generic Memory Interface Guidelines.
>
> >> Daniel
>
> >> ratemonotonic schrieb:
>
> >>> Hi All ,
> >>> I am trying to interface microblaze with a Micron DDR SDRAM
> >>> (MT46V16M16FG-75 16Mx16) using MPMC from the IP catalogue. As I am
> >>> running on Spartan 3 FPGA I need to connect port lines - DDR_DQS_DIV_O
> >>> and DDR_DQS_DIV_I , else I get errors , it also states that these
> >>> should be connected in for spartan 3.
> >>> The problem is that there is not much documentation about these port
> >>> lines in the MPMC data sheet. Has anyone used this? does any one know
> >>> how to connect these lines up?
> >>> thanks in advance
> >>> BR
> >>> rate
>
> > Hi Daniel ,
>
> > Thanks for the links the doc looks good and I am going through it now.
> > Is the MPMC suitable to interface with asynchronous DDR SDRAMS? i.e.
> > the reference board I am using has Micron MT46V16M16FG-75 16Mx16 part
> > which takes min 75mhz clock. the microblaze on the board is running at
> > 50 Mhz, but the board has 75Mhz clock. In the original design an OPB
> > DDR SBRAM controller was used in which there was seperate control for
> > the DDR clock inputs , but MPMC only seems to take the system clock as
> > an input which is my case is 50 Mhz. How do I produce an 75 Mhz DDR
> > clock from MPMC?
>
> The MPMC can not produce a 75Mhz clock from a 50 Mhz source. But the
> MPMC supports 1:2 System/PIM clock and memory clock.
>
> See at page 50 of Datasheet MPMC (DS643) near "<PIM>_Clk".
>
> For example you have a 50Mhz source clock, use clk0 (system clock) and
> clk2x output of a DCM to produce the 100Mhz memory clock. Do not forget
> to connect clk0 and clkfb to assure zero phase offset.
>
>
>
> > Thanks very much ,
> > BR
> > Rate

Hi Daniel,
Thanks a lot !  I sort of see light at the end of the tunnel now with
your suggestion! I will let you know when I have tested the setup!

Thanks
rate