RE: [Sdcc-user] parity wiegand 26 bts

[Story, L. <Lenny.Story@Alcatel.com>]

Greetings,

I am assuming you recieved the spec i sent you.

From The spec :=20

	Table 3: 26-bit Wiegand Format
	------------------------------------------------
	Bit 1 --- Even parity over bits 2 to 13
	Bits 2 to 9 --- Facility code (0 to 255); Bit 2 is MSB
	Bits 10 to 25 --- ID Number (0 to 65,535); Bit 10 is MSB
	Bit 26 --- Odd parity over bits 14 to 25

Just as it says above, Compute the numbe of EVEN bits in 2-13, if the
number is ODD, then set Bit 1. Else, Clear it.

Same idea for the parity on Bit 26, Compute the number of ODD bits=20
in 14 - 25. If the number is ODD clear bit 26, else set it.

The parity bits are used to make the parity equal the type. If  you are
using
even parity, then the total of even bits in the field PLUS the parity =
bit
should be
even.

Same with odd parity, total up the number of odd bits in the field, and =
use
the=20
ODD parity bit to make it ODD.

Hope this helps
-Lenny


-----Original Message-----
From: Helton Marques [mailto:hm...@ya...]
Sent: Wednesday, January 22, 2003 7:45 AM
To: SDCC User list
Subject: [Sdcc-user] parity wiegand 26 bts


	Please...

	Anyone know how to calculate the Parity even and Parity oven in
protocol Wiegand 26 bits ?
	Thanks...




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