| Author |
Message |
Raul Fajardo
Guest
|
 Posted:
Fri Jan 07, 2005 10:12 pm Post subject:
Choosing a DSP chip to work with |
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Hello,
I have been looking for a DSP chip through the TI website but none of
the quick descriptions there were good enough to take a decision. I
have been looking in datasheets, but as I´m not sure if I will work
with these or that DSP, I´m losing quite some time.
The real problem is, many of the DSP´s are able to do the job, but
they have really big footprints. I wonder if it isnt possible to find
a small one that fits better with the project.
The requirements are listed below, it seems that a microcontroller
would do it, but the task is really real time dependent, so I´m
looking for a DSP chip.
The DSP must have fast communication with one AD conversor what would
require 12 Input pins with something more than 5MHz digital input
speed.
Two output clocks with possibility of delay between them but with same
speed 5MHz precisely.
The processment is based on simply MACS because it will be an Rank
Algoritm, so I guess I wouldn´t need a so fast processor. Would
require something like 1 MAC per data read. Some more processment
speed is necessary to analyse the rank and switch on or off an
external device.
Also necessary is a serial port to comunicate with a USB chip
controller to calibrate the device. To switch coeffecients from the
multiplier vector. Simple protocol and no speed requirements.
Already thought about the TMS320LF2401a, that has a small footprint
but it seems that due to the ammount of cycles required to do the
reads it would be hard to work with.
Thought also about the TMS320C54x family that seems to have better IO
capability but they have already minimal 100 pins what is much
compared to the 32 from the above one. Tough I´m here to hear other
opinions.
Thanks a lot in advance
Raul Fajardo |
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Al Clark
Guest
|
| Posted:
Sat Jan 08, 2005 3:12 am Post subject:
Re: Choosing a DSP chip to work with |
|
|
rfajardo@gmail.com (Raul Fajardo) wrote in
news:6eeb4a0a.0501070912.757bb0e2@posting.google.com:
| Quote: | Hello,
I have been looking for a DSP chip through the TI website but none of
the quick descriptions there were good enough to take a decision. I
have been looking in datasheets, but as I´m not sure if I will work
with these or that DSP, I´m losing quite some time.
The real problem is, many of the DSP´s are able to do the job, but
they have really big footprints. I wonder if it isnt possible to find
a small one that fits better with the project.
The requirements are listed below, it seems that a microcontroller
would do it, but the task is really real time dependent, so I´m
looking for a DSP chip.
The DSP must have fast communication with one AD conversor what would
require 12 Input pins with something more than 5MHz digital input
speed.
Two output clocks with possibility of delay between them but with same
speed 5MHz precisely.
The processment is based on simply MACS because it will be an Rank
Algoritm, so I guess I wouldn´t need a so fast processor. Would
require something like 1 MAC per data read. Some more processment
speed is necessary to analyse the rank and switch on or off an
external device.
Also necessary is a serial port to comunicate with a USB chip
controller to calibrate the device. To switch coeffecients from the
multiplier vector. Simple protocol and no speed requirements.
Already thought about the TMS320LF2401a, that has a small footprint
but it seems that due to the ammount of cycles required to do the
reads it would be hard to work with.
Thought also about the TMS320C54x family that seems to have better IO
capability but they have already minimal 100 pins what is much
compared to the 32 from the above one. Tough I´m here to hear other
opinions.
Thanks a lot in advance
Raul Fajardo
|
Why restrict your search to TI? Analog Devices has both the Blackfin &
SHARC.
--
Al Clark
Danville Signal Processing, Inc.
--------------------------------------------------------------------
Purveyors of Fine DSP Hardware and other Cool Stuff
Available at http://www.danvillesignal.com |
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jaac
Guest
|
| Posted:
Sat Jan 08, 2005 3:52 am Post subject:
Re: Choosing a DSP chip to work with |
|
|
Yes, Al.
But none is smaller, in pin count. Maybe the Blackfin is small enough
in oveall size.
JaaC |
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Brian Dam Pedersen
Guest
|
| Posted:
Sun Jan 09, 2005 12:00 am Post subject:
Re: Choosing a DSP chip to work with |
|
|
jaac wrote:
| Quote: | Yes, Al.
But none is smaller, in pin count. Maybe the Blackfin is small enough
in oveall size.
JaaC
Take a look at the dsPIC chips from Microchip. They might fit your needs |
and come in small packages too.
--
Brian Dam Pedersen
M.Sc.EE |
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