DDR2 VHDL model

[ALuPin]

Hi,

on the following link

http://www.samsung.com/products/sem...omponent/256Mbit/K4T56083QF/K4T56083QF.htm#ge

there are DDR2 memory VHDL simulation models from Samsung available.

But the compressed download files only contain .dat files.
Are these files suitable for functional simulations ?
I have always simulated with "real" vhdl models ...

Rgds
André

 

[Sean Durkin]

Hi,

on the following link

http://www.samsung.com/products/sem...omponent/256Mbit/K4T56083QF/K4T56083QF.htm#ge

there are DDR2 memory VHDL simulation models from Samsung available.

But the compressed download files only contain .dat files.
Are these files suitable for functional simulations ?
I have always simulated with "real" vhdl models ...

These are precompiled models and only work in the corresponding
simulator. I.e., if it says the model is for ModelSim SunOS, chances are
it only works when you simulate in ModelSim SunOS.

But Samsung is pretty cooperative if you ask them to supply precimpiled
models for let's say ModelSim 6.2 Windows. They'll make models for you,
but they won't supply you with the source code.

I've mostly used Verilog-models from Micron, which are very good.
Fortunately, I never had to change anything in them, so my lack of
Verilog-knowledge didn't hurt.

cu,
Sean

 

[Nicolas Matringe]

Sean Durkin a écrit :

Hi,

on the following link

http://www.samsung.com/products/sem...omponent/256Mbit/K4T56083QF/K4T56083QF.htm#ge

there are DDR2 memory VHDL simulation models from Samsung available.

But the compressed download files only contain .dat files.
Are these files suitable for functional simulations ?
I have always simulated with "real" vhdl models ...

[...]
I've mostly used Verilog-models from Micron, which are very good.
Fortunately, I never had to change anything in them, so my lack of
Verilog-knowledge didn't hurt.

I am currently working with a DDR2 VHDL model from Hynix (but I don't
have the slightest cue about where it was downloaded)


Nicolas

 

[FMF]

Andre,

Free Model Foundry (http://www.freemodelfoundry.com) has 2 DDR2 models.
Just type DDR2 into the search window.

Rick

 

[ALuPin]

Thank you for your replies.

Rgds
Andre

 

[ALuPin]

Hi Rick,

I have compiled the Micron model "mt47h64m16.vhd" and get the following
warnings (ModelSim Lattice 6.2c) :


# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(796):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(797):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(800):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(801):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(802):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(803):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(805):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(807):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(811):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(812):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(813):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(816):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(817):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(818):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(824):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(827):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(835):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(841):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(842):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(848):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(849):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(851):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(854):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(859):
(vcom-1236) Shared variables must be of a protected type.
# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(863):
(vcom-1236) Shared variables must be of a protected type.

Is there any conflict with that warnings ?
Rgds
Andre

 

[Jonathan Bromley]

I have compiled the Micron model "mt47h64m16.vhd" and get the following
warnings (ModelSim Lattice 6.2c) :

# ** Warning:
R:/EDA/DDR2Controller/FreeModelFoundry_DDR2Model/mt47h64m16.vhd(796):
(vcom-1236) Shared variables must be of a protected type.

Is there any conflict with that warnings ?

Try setting your ModelSim compile for VHDL-93 mode (vcom -93 ...)
Protected types were introduced for VHDL-2002, which is
probably your default setting.
--
Jonathan Bromley, Consultant

DOULOS - Developing Design Know-how
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Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK
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The contents of this message may contain personal views which
are not the views of Doulos Ltd., unless specifically stated.

 

[ALuPin]

any conflict with that warnings ?

Try setting your ModelSim compile for VHDL-93 mode (vcom -93 ...)
Protected types were introduced for VHDL-2002, which is
probably your default setting.

Hi Jonathan,

yes, the default setting is VHDL.2002, changing it to VHDL-93
removes the warnings.

Most models seems not to be written for VHDL-2002 yet ...

Rgds
Andre

 

[miheer]

Hi,
I am also getting Warning for shared variable while compiling. can you pls tell how to change the default setting from VHDL 2002 to VHDL-93 in Modelsim Questa 6.4c?

Thanks