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'[EE]: FPGA/GAL/PIC for port expansion/conversion'
2001\12\06@113748 by Simon-Thijs=20de=20Feber?=

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Hello,

I am in doubt how to solve the following issue.
I have a 4 bit input and need to convert it to a 6 bit
output.
This can probably be done with a look-up table
(FPGA/GAL/PIC)
The Table is as follows
In     Out
0000   111111
0001   111101
0010   111110
0011   111010
0100   111000
0101   111010
0110   101001
0111   101000
1000   110000
1001   010000

Any one a good solution ???


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2001\12\06@121807 by mike

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Depends on your speed/power requirements, and things like glitch
tolerance, clocking requirements etc. There would probably be little to choose between a PIC and a GAL in
terms of cost and board space. If you want the highest speed, a GAL is the clear winner. For minimum
power, if speed is not an issue, the PIC would have the edge

For minimum power and maximum speed, hardwire it with some CMOS gates.

On Thu, 6 Dec 2001 16:36:20 +0000, you wrote:

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2001\12\06@132449 by Dale Botkin

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An old bipolar PROM would work too...  82S123, 74288, something like that
wuld do quite nicely, not sure about how easy to find they may be though.
But a simple PAL or GAL would certainly do it.

Dale
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2001\12\06@140416 by Jon Baker

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You might be able to use karnaugh maps to simplify the logic behind the
conversion into a circuit using a few cheap off the shelf logic gates.

Jon Baker
.....jonKILLspamspam.....hayseed.net

{Original Message removed}

2001\12\07@065513 by Vasile Surducan

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On Thu, 6 Dec 2001, [iso-8859-1] Simon-Thijs de Feber wrote:

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include 16f628_4
include jpic628
cmcon = 0x07

var byte input is port_a_low
port_a_low_direction = input
var byte output is port_b
port_b_direction = output

forever loop
if    input = 0     then output = 0x_ff
elsif input = 0x_01 then output = 0x_fd
elsif input = 0x_02 then output = 0x_fe
; ettcetera
endif
end loop

jal, no lookup table

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2001\12\07@203136 by Simon-Thijs=20de=20Feber?=

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Hello,


Does any one know where to get a PCF8575 or PCA9555
???
These are I2C 16 bit IO expanders.

I can't find them !

grtz,

Simon

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