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參數資料
型號： W89C840AF
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 100/10Mbps Ethernet Controller
中文描述： 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP128
封裝： PLASTIC, QFP-128
文件頁數： 23/82頁
文件大小： 918K
代理商： W89C840AF
W89C840AF
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23
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Publication Release Date:October 2000
Revision 1.01
All the 48 bits destination address(including physical address, multicast address and broadcast address)
of the incoming packet will be fed into the CRC generating mechanism. The six most significant bits of the
CRC(CRC31, CRC30, ... CRC26) will determine which group the incoming packet belongs to. The relationship
between these six bits of CRC content and the group which the multicast address belongs to is shown as the
following table.
CRC
CRC28,27,26
31,30,29
111
110
101
100
011
010
001
000
000
grp 8
grp 7
grp 6
grp 5
grp 4
grp 3
grp 2
grp 1
001
grp 16
grp 15
grp 14
grp 13
grp 12
grp 11
grp 10
grp 9
010
grp 24
grp 23
grp 22
grp 21
grp 20
grp 19
grp 18
grp 17
011
grp 32
grp 31
grp 30
grp 29
grp 28
grp 27
grp 26
grp 25
100
grp 40
grp 39
grp 38
grp 37
grp 36
grp 35
grp 34
grp 33
101
grp 48
grp 47
grp 46
grp 45
grp 44
grp 43
grp 42
grp 41
110
grp 56
grp 55
grp 54
grp 53
grp 52
grp 51
grp 50
grp 49
111
grp 64
grp 63
grp 62
grp 61
grp 60
grp 59
grp 58
grp 57
A packet with multicast address which belongs to the nth group will be accepted if the relative
bit of the
nth group in C38/CMA0 and C3C/CMA1 is set to high and the bit 4 of C18/CNCR is also set to high.
Besides the address recognition function, the MAC also performs the frame check sequence validation
function. Each incoming packet data, including the destination address, source address, the packet data and the
4 bytes CRC data will be fed into the MAC
CRC generating logic to generate a 4 bytes CRC sequence. The
MAC will compare this new CRC data with the one, included in the incoming packet. It will be recognized as
an error packet if these two 4-byte CRC data is not the same. But the bit 7 of C18/CNCR will determine if the
MAC accepts the error packet or not. A high value of this bit will force MAC to accept the error packet, and
low to reject. An incoming packet without byte alignment will be treated as an error packet. Some packets with
the length less than 64 bytes caused by the collision event on the network are also treated as an error packet.
The terminology for the packet with the length less than 64 bytes is called as runt packet. The extra control bit
for accepting the runt packet is defined as the bit 6 of C18/CNCR. To accept a runt packet, both of the bit 6 and
bit 7 of C18/CNCR should be set to high.
The MAC will, finally, do the framing function to strip the preamble and the SFD before sending the
receive data to the receive DMA machine. The data sent to the receive DMA state machine includes the LLC
data and the 4 bytes CRC.
Loopback diagnostics function
The loopback mode defined for W89C840AF is used for diagnostic. The transmit out data will appear
on the MII interface and will then be fed back into the internal receive channel of the MAC block and then be
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相關代理商/技術參數
參數描述
W89C840F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN NODE CONTROLLER
W89C841D 制造商:WINBOND 制造商全稱:Winbond 功能描述:3-IN - 1 10/100M FAST ETHERNET CONTROLLER
W89C841F 制造商:WINBOND 制造商全稱:Winbond 功能描述:3-IN - 1 10/100M FAST ETHERNET CONTROLLER
W89C841F/D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3-IN-1 100BASE-TX/FX & 10BASE-T Ethernet Controller
W89C880F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Hub Controller
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