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WORKSHEET #2 1/0 INSTRUCTIONS
DATA
CALCULATIONS
N Inslrucllonsl
Conver
Clock
110
N Input
N Outpul
Tolal N 1/0
slon
Speed
Input Oulpul
~ro~:·
~ro~:·
Instruc·
Accuracy
lions
9 Blls
10MHz
33
15
1
1
48
(54 dB)
5MHz
22
8
lMHz
20
2
6 Blls
10MHz
24
15
(36dB)
5MHz
16
8
lMHz
14
2
1 BII
10MHz
6
15
2
1
27
Serial
5MHz
4
8
Dlgllal
110
lMHz
3
2
TOTAL
75
WORKSHEET #3 2920 FINAL WORKSHEET
2920
APP #1 APP #2 APP #3 APP #4
Modem
Dynamic
Range
.. 54dB
54dB
Bandwidth
.. y,
Sample Rate
3kHz
II Instructions
1/0
75
Digital
.. ,92
152
# RAM
locations
.. 40
40
# Inputs
.. 4
3
# Outputs
.. 8
2
TOTALS FOR THE MODEM
RAM
DIGITAL INSTRUCTIONS
1/0 INSTRUCTIONS
40
152
75
This corresponds to a sample rate of
10MHz
1
F(s)
=
- 4 -
152
=
16.4kHz
So the 13.6kHz sample rate desire can be achieved.
THIS APPLICATION CAN BE DONE WITH ONE 2920.
APPENDIX
A-9
Since some RAM locations used by one functional block
can usually be reused by another, this estimate for the number
of RAM locations needed is probably high.
Since I/O and digital operations are done in parallel, the
longer sequence, I/O or digital, will probably determine program
length. Since 1/0 will require only 75 instructions, all I/O can
probably be done during the 152 digital instructions. The digital
instructions then determine overall program length.
Conclusion:
This application can be implemented with one 2920.
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