AM79C90PC datasheet(48/62 Pages) AMD

48 / 62 page

Am79C90

Hash Filter Generation Programs for

Logical Addressing

APPENDIX A

80x86 computer program example to generate the hash filter, for multicast addressing in the C-LANCE.

;

SUBROUTINE TO SET A BIT IN THE HASH FILTER FROM A

;

GIVEN ETHERNET LOGICAL ADDRESS

;

ON ENTRY Sl POINTS TO THE LOGICAL ADDRESS WITH LSB FIRST

;

Dl POINTS TO THE HASH FILTER WITH LSB FIRST

;

ON RETURN Sl POINTS TO THE BYTE AFTER THE LOGICAL ADDRESS

;

ALL OTHER REGISTERS ARE UNMODIFIED

;

PUBLIC SETHASH

ASSUME CS:CSE61

;

= 1DB6

POLYL

EOU

1DB6H

;CRC POLYNOMINAL TERMS

= 04C1

POLYH

EQU

04C1H

;

0000

CSE61

SEGMENT PUBLIC ‘CODE’

;

0000

SETHASH PROC

NEAR

0000 50

PUSH

;SAVE ALL REGISTERS

0001 53

PUSH

0002 51

PUSH

0003 52

PUSH

0004 55

PUSH

;

0005 B8 FFFF

MOV

AX,0FFFFH

;AX,DX =CRC ACCUMULATOR

0008 BA FFFF

MOV

DX,0FFFFH

;PRESET CRC ACCUMULATOR TO ALL 1’S

000B B5 03

MOV

CH,3

;CH =WORD COUNTER

;

000D 8B 2C

SETH10:

MOV

BP,[S1]

;GET A WORD OF ADDRESS

000F 83 C6 02

ADD

S1,2

;POINT TO NEXT ADDRESS

0012 B1 10

MOV

CL,16

;CL=BIT COUNTER

;

0014 8B DA

SETH20:

MOV

BX,DX

;GET HIGH WORD OF CRC

0016 D1 C3

ROL

BX,1

;PUT CRC31 TO LSB

0018 33 DD

XOR

BX,BP

;COMBINE CRC31 WITH INCOMING BIT

001A D1 E0

SAL

AX,1

;LEFT SHIFT CRC ACCUMULATOR

001C D1 D2

RCL

DX,1

001E 81 E3 0001

AND

BX,0001H

;BX=CONTROL BIT

0022 74 07

SETH30

;DO NOT XOR IF CONTROL BIT = 0

;

PERFORM XOR OPERATION WHEN CONTROL BIT= 1

AM79C90PC 数据表(PDF) 48 Page - Advanced Micro Devices

AM79C90PC 数据表(HTML) 48 Page - Advanced Micro Devices

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AM79C90PC 数据表(PDF) 48 Page - Advanced Micro Devices

AM79C90PC 数据表(HTML) 48 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

数据表 下载

链接网址

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