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Guest
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 Posted:
Wed Oct 05, 2005 10:49 pm Post subject:
query regardin 9572 cpld |
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cud ne one pl tell me that is 9572 or ne other cpld of xc 9500 family
capable of accomodatinga fast fixed point ALU? |
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Kelly Hall
Guest
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| Posted:
Thu Oct 06, 2005 7:06 am Post subject:
Re: query regardin 9572 cpld |
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sparsharun@gmail.com wrote:
| Quote: | cud ne one pl tell me that is 9572 or ne other cpld of xc 9500 family
capable of accomodatinga fast fixed point ALU?
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Sure, depending on your word size. You can always use more than one CPLD.
Kelly |
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Thomas Womack
Guest
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| Posted:
Fri Oct 07, 2005 10:46 pm Post subject:
Re: query regardin 9572 cpld |
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In article <1128720958.619008.278440@z14g2000cwz.googlegroups.com>,
<sparsharun@gmail.com> wrote:
| Quote: | i want to accomodate a 16 bit fast fixed point alu. actually my proj
involves the implementation of fast furier transform using a cpld. can
ne one help me in this regards in ne way...
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Write the code for a fixed-point ALU - it needn't be at all
sophisticated, something like
wire a,b,op; reg c;
c <= ((op == 00) & (a+b)) | ((op == 01) & (a-b)) | ((op == 10) & ((a*b)>>15))
(pardon my pidgin HDL) would do, if that doesn't fit then the real
thing won't, but the real thing shouldn't be _much_ bigger. Compile it
for the 9572 and see if it fits ... if you want lots of confidence
that it'll remain fitting even after growth, compile the tiny ALU for
the 9536 instead.
If it doesn't fit, consider dropping an extra $3 per unit and going
for a Spartan XC3S50.
I'm not sure how we can help you out beyond this. FFT cores are out
there at opencores.org, though I don't think many of them target
CPLDs ... why, in fact, do you want to do an FFT in a CPLD?
Tom |
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Guest
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| Posted:
Sat Oct 08, 2005 12:15 am Post subject:
query regardin 9572 cpld |
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i want to accomodate a 16 bit fast fixed point alu. actually my proj
involves the implementation of fast furier transform using a cpld. can
ne one help me in this regards in ne way... |
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Guest
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| Posted:
Sat Oct 08, 2005 8:15 am Post subject:
query regardin 9572 cpld |
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thank u tom for replyin to my query...
actually i hav been given a project to implement FFT using an AVR
Mega16 and a XC95108 cpld. so il b using the cpld to implement a 16 bit
alu. jus wanted to no if this is possible. n ne other other help for
the proj wil b welcome... |
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