參數(shù)資料
型號: AM79C90JC
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, PQCC68
封裝: PLASTIC, LCC-68
文件頁數(shù): 49/62頁
文件大小: 437K
代理商: AM79C90JC
AMD
49
Am79C90
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;
0024 35 1D 86
0027 81 F2 04C1
XOR
XOR
AX,POLYL
DX,POLYH
;
SETH30:
002B 0B C3
002D D1 CD
002F FE C9
0031 75 E1
0033 FE CD
0035 75 D6
OR
ROR
DEC
JNZ
DEC
JNZ
FORMATION OF CRC COMPLETE, AL CONTAINS THE REVERSED HASH
CODE
MOV
CX,10
SAL
AL,1
;REVERSE THE ORDER OF BITS IN AL
RCR
AH,1
;AND PUT IT IN AH
LOOP
SETH40
AX,BX
BP,1
CL
SETH20
CH
SETH10
;PUT CONTROL BIT IN CRC0
;ROTATE ADDRESS WORD
;DECREMENT BIT COUNTER
;DECREMENT WORD COUNTER
;
;
0037 B9 000A
003A D0 E0
003C D0 DC
003E E2 FA
SETH40:
;
;
AH NOW CONTAINS THE HASH CODE
0040 8A DC
0042 B1 03
0044 D2 EB
0046 B0 01
0048 80 E45 07
004B 8A CC
004D D2 E0
004F 08 01
0051 5D
0052 5A
0053 59
0054 5B
0055 58
0056 C3
MOV
MOV
SHR
MOV
AND
MOV
SHL
OR
POP
POP
POP
POP
POP
RET
BL,AH
CL,3
BL,CL
AL,01H
AH,7H
CL,AH
AL,CL
[Dl + BX],AL
BP
DX
CX
BX
AX
;BL = HASH CODE, BH IS ALREADY ZERO
;DIVIDE HASH CODE BY 8
;TO GET TO THE CORRECT BYTE
;PRESET FILTER BIT
;EXTRACT BIT COUNT
;SHIFT BIT TO CORRECT POSITION
;SET IN HASH FILTER
;
SETHASH ENDP
;
CSEG1
;
0057
0057
ENDS
END
Program example in BASIC to generate the hash filter, for multicast addressing, in the C-LANCE.
100 REM
110 REM PROGRAM TO GENERATE A HASH NUMBER GIVEN AN ETHERNET ADDRESS
120 REM
130 DEFINT A–Z
140 DIM A(47): REM ETHERNET ADDRESS. 48 BITS.
150 DIM A$(6): REM INPUT FROM KEYBOARD
160 DIM C(32): REM CRC REGISTER–32 BITS
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AM79C90JCTR 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:CMOS Local Area Network Controller for Ethernet (C-LANCE)
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AM79C90PCTR 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:CMOS Local Area Network Controller for Ethernet (C-LANCE)