AM79C90PC datasheet(51/62 Pages) AMD

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AMD

Am79C90

640

C(1) = C(1) XOR 1: C(2) = C(2) XOR 1: C(4) = C(4) XOR 1

650

C(5) = C(5) XOR 1: C(7) = C(7) XOR 1: C(8) = C(8) XOR 1

660

C(10) = C(10) XOR 1: C(11) = C(11) XOR 1: C(12) = C(12) XOR 1

670

C(16) = C(16) XOR 1: C(22) = C(22) XOR 1: C(23) = C(23) XOR 1

680

C(26) = C(26) XOR 1

690

C(0) = 1

700

NEXT N

710

REM

720

REM CRC COMPUTATION COMPLETE, EXTRACT HASH NUMBER FROM C(0) TO C(5)

730

REM

740

HH=32*C(0)+16*C(1)+8*C(2)+4*C(3)+2*C(4)+C(5)

750

PRINT “THE HASH NUMBER FOR ”;

760

PRINT A$(0); “ ”; A$(1); “ ”; A$(2); “ ”; A$(3); “ ”; A$(4); “ ”; A$(5);

770

PRINT “IS”; HH

780

GOTO 210

Program example in C to generate the hash filter, for multicast addressing in the C-LANCE.

/************************************************************

* hash.c

Rev 0.1

* Generate a logical address filter value from a list of

* Ethernet multicast addresses.

* Input:

User is prompted to enter an Ethernet address in

Ethernet hex format: First octet entered is the first

octet to appear on the line. LSB of most

significant octet is the first bit on the line.

Octets are separated by blanks.

After results are printed, user is prompted for

another address.

(Note that the first octet transmitted is stored in

the C-LANCE as the least significant byte of the Physical

Address Register.)

* Output:

After each address is entered, the program prints the

hash code for the last address and the cumulative

address filter function. The filter function is

printed as 8 hex bytes, least significant byte first.

****************************************************************/

#include <stdio.h>

void updateCRC (int bit);

int adr[6],

/* Ethernet address */

ladrf[8], /* Logical address filter */

CRC[33],

/* CRC register, 1 word/bit + extra control bit */

poly[] =

/* CRC polynomial. poly[n] = coefficient of

the x**n term of the CRC generator polynomial. */

{1,1,1,0, 1,1,0,1,

1,0,1,1, 1,0,0,0,

1,0,0,0, 0,0,1,1,

0,0,1,0, 0,0,0,0

};

void main()

AM79C90PC Datasheet(PDF) 51 Page - Advanced Micro Devices

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