參數(shù)資料
型號: AM79C90PC
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: CMOS Local Area Network Controller for Ethernet (C-LANCE)
中文描述: 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PDIP48
封裝: PLASTIC, DIP-48
文件頁數(shù): 48/62頁
文件大?。?/td> 437K
代理商: AM79C90PC
48
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.
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;
;
;
;
;
;
;
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
;
POLYL
POLYH
;
CSE61
;
SETHASH PROC
= 1DB6
= 04C1
EOU
EQU
1DB6H
04C1H
;CRC POLYNOMINAL TERMS
0000
SEGMENT PUBLIC ‘CODE’
0000
000050
000153
000251
000352
000455
NEAR
AX
BX
CX
DX
BP
PUSH
PUSH
PUSH
PUSH
PUSH
;SAVE ALL REGISTERS
;
0005 B8 FFFF
0008 BA FFFF
000B B5 03
MOV
MOV
MOV
AX,0FFFFH
DX,0FFFFH
CH,3
;AX,DX =CRC ACCUMULATOR
;PRESET CRC ACCUMULATOR TO ALL 1’S
;CH =WORD COUNTER
;
SETH10:
000D 8B 2C
000F 83 C6 02
0012 B1 10
MOV
ADD
MOV
BP,[S1]
S1,2
CL,16
;GET A WORD OF ADDRESS
;POINT TO NEXT ADDRESS
;CL=BIT COUNTER
;
SETH20:
0014 8B DA
0016 D1 C3
0018 33 DD
001A D1 E0
001C D1 D2
001E 81 E3 0001
0022 74 07
MOV
ROL
XOR
SAL
RCL
AND
JZ
BX,DX
BX,1
BX,BP
AX,1
DX,1
BX,0001H
SETH30
;GET HIGH WORD OF CRC
;PUT CRC31 TO LSB
;COMBINE CRC31 WITH INCOMING BIT
;LEFT SHIFT CRC ACCUMULATOR
;BX=CONTROL BIT
;DO NOT XOR IF CONTROL BIT = 0
;
;
PERFORM XOR OPERATION WHEN CONTROL BIT= 1
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