| Author |
Message |
dspxscott
Guest
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 Posted:
Wed Dec 14, 2005 5:16 pm Post subject:
best DRAM solution for motorola DSP56364 |
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Hello
I need to interface 4MB of DRAM to a motorola DSP56364 and want to do i
as cheaply as possible with the minimal amount of components. My firs
idea was to use an off the shelf (surplus) 4MB 30 pinn simm that you ca
pick up for a few bucks. The socket takes up minimal PCB real estate.
The problem is they are 5V and the 56364 is 3.3V
Any suggestions on interfacing the two. What would happen if i ran th
simm from 3.3V?
Or is there another route i should be considering.
Maybe there is an off the shelf 4MB 3.3V dram chip i don't know about.
Thank you in advance for any suggestions and advice you can give.
Best regards
Scott |
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Jose
Guest
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| Posted:
Wed Dec 14, 2005 11:43 pm Post subject:
Re: best DRAM solution for motorola DSP56364 |
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Scott,
I wanted to do the same, but I found that DRAM management is not easy.
Also, I think DSP56364 data bus is 8-bit wide, so maybe you would need
to pack/unpack bytes in every read/write, that is an overhead you
should take into account. Finally I moved to DSP56367 because its data
bus is 24-bit wide and I can interface it directly to 24-bit SRAM
memory.
Regards
Jose |
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dspxscott
Guest
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| Posted:
Thu Dec 15, 2005 1:02 am Post subject:
Re: best DRAM solution for motorola DSP56364 |
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| Quote: | Scott,
I wanted to do the same, but I found that DRAM management is not easy.
Also, I think DSP56364 data bus is 8-bit wide, so maybe you would need
to pack/unpack bytes in every read/write, that is an overhead you
should take into account. Finally I moved to DSP56367 because its data
bus is 24-bit wide and I can interface it directly to 24-bit SRAM
memory.
Regards
Jose
|
I am pretty much stuck with the 56364 at the moment and i understand tha
the bytes will need be manipulated. Do you have any info on availabl
glueless dram solutions for the 56364?
Thanks in advance. |
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Roman Rumian
Guest
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| Posted:
Sat Dec 17, 2005 5:15 pm Post subject:
Re: best DRAM solution for motorola DSP56364 |
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Hi Jose,
dspxscott napisał(a):
| Quote: | Scott,
I wanted to do the same, but I found that DRAM management is not easy.
Also, I think DSP56364 data bus is 8-bit wide, so maybe you would need
to pack/unpack bytes in every read/write, that is an overhead you
should take into account. Finally I moved to DSP56367 because its data
bus is 24-bit wide and I can interface it directly to 24-bit SRAM
memory.
Regards
Jose
I am pretty much stuck with the 56364 at the moment and i understand that
the bytes will need be manipulated. Do you have any info on available
glueless dram solutions for the 56364?
|
you can gluelessly connect any type of FP or EDO (ASYNCHRONOUS !!!)
DRAM. See page 2-30 of datasheet. If, mentioned by you 30 pin simm
module is build of this type IC's you can also connect it.
Regards
Roman Rumian |
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