To point
out some of the advanatges of the 56F8300:
- The 56F8300 is a
flashed based device while the ADI is RAM based. So the ADI will require an
external device of some kind to load up the
program.
- The 56F8300 offers flash security
while the ADI device does not. Hence you can protect your Software Intellectual
property
- The 56F8300 data flash can be used
to emulate EEPROM while the ADI device has not non volatile memory storage
capability
- The 56F8300 has an internal voltage
regulator, POR, and LVI while the ADI
doesn't
- The 56F8357 offers much greater
internal memory than the ADI 21992
- The 56F8357 offers
many more internal peripherals than the ADI. The 56F8300 has two 6 ch PWM units,
16 channels of ADC, two quad decoders, more SCI and SPI and GPIO and timers as
opposed to the ADI 21992 that offers only one 6 ch PWM, 8 channels of ADC, one
decoder, and far fewer of the other peripherals
listed.
- The 56F8300 ADC has a superior ADC
range of 0 to 3.3 volts
- The 56F8300 has a
superior external memory interface that can operate at full rate (80 MHz) while
the ADI EMI is limited to 20 MHz
- The 56F8300 has 5
volt tolerant I/O while the ADI device does not
- In
addition the 56F8300 portfolio is larger and more diverse than the ADI products.
If the ADI 21992 device was sufficient for your project then you can most likely
choose a smaller device than the 56F8357.
- The
56F8300 is a Hybrid core so it will much more easily and efficiently handle the
Microcontroller code.
- 56F8300 Flexcan
module that has been used for many years on many different part families as
opposed to ADIs new CAN module. We also support CAN on all the 56F8300 devices
- More full functioned
peripherals
As far as
the software tools go the 56F8300 core and compiler provide better code
efficiency. They also offer a rapid development enviroment called processor
expert supporting automatic code generation and a tool called PC MAster for real
time debugging. The 56F8300 is supported by CodeWarrior. This tool has been used
for several years supporting the previous 56850 series of 56800E based devices.
The 56F8300 should be
able to easily handle the processing that your application requires.
Thanks.
-
Bill
I am sorry for my english that is not very good. I try
to tell you my incertitude about these DSP.
1) Actually we use an
ADMC401 for a brushless motor drive. We interface motor with resolver and
sin-cos transducer. But we have on the same board a cpu infineon for
the fieldbus CAN interface. Now I have to reduce drastically the board
dimentions and I need an effective embedded solution: one only
processor with flash, ram and peripheral interfaces.
2) I
don't know if the motorola dsp speed (60 MIPS) is
enough to
complete all the activities in 50us (actual loop timing, 20KHz PWM):
- current loop (50us) - speed loop (50us) - position loop
(100us) - CAN management
Currently we work at 25 MIPS with the
ADMC401, but we have some time scheduling problem and the CAN management is delegated to cpu.
3) I have some doubt about the ADC
resolution (12 bit) and conversion time (1,2us each pair of channels) beacause for the ADSP21992 we have 14bit and 200ns! The ADSP21992 ADC are
much faster. This feature could be useful for the sin-cos signals
acquisition.
4) I read the main 56F8357 features and I think this dsp coud be a good choice for our application, but I don't know : - the present condition about the maturity of this DSP (software/hardware
bugs) - the documentation level - the problems I can meet with
hardware development All these problems are typical when a new design
will be started.
Thank you .
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