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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： | 22/82頁 |
| 文件大小： | 918K |
| 代理商： | W89C840AF |
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W89C840AF
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22
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Publication Release Date:October 2000
Revision 1.01
The MAC performs the receive functions specified by the IEEE802.3 including the address recognition
function, the frame check sequence validation, the frame disassembly, framing and collision filtering.
The W89C840AF categorizes the input stream from media into three types of frame. These three types
are the packet with uni-cast destination address, the multicast destination address and the broadcast destination
address. A uni-cast address is defined as a destination address with its first bit(the LSB) low. A multicast
address is defined as a destination address with its first bit(the LSB) high but the other 47 bits are not all one. A
broadcast address is defined as a destination address with its all 48 bits are one. All the three types of the packet
reception is selectively determined by the configuration of the bit 3, 4 and 5 of the C18/CNCR register of the
W89C840AF.
The C40/CPA0 and C44/CPA1 are used to store your own 48 bits Ethernet ID. of the network node
before starting to receive a packet. Its contents comes from EEPROM after power-on reset.
The mapping relationship between the 48 bits ID and the C40/CPA0 and C44/CPA1 is as following table.
Bit 31~ 24
Bit 23 ~ 16
Bit 15 ~ 8
Bit 7 ~ 0
C40/CPA0
32th ~ 25th
24th ~ 17th
16th ~ 9th
8th ~ 1st
C44/CPA1
reserved
reserved
48th ~ 41th
40th ~ 33th
The incoming packet with unicast address will be accepted if the bit 3 of C18/CNCR is reset to low and
the destination address of the incoming unicast packet has to match with the content of C40/CPA0 and
C44/CPA1 setting.
All of the incoming packet with unicast address will be accepted if the bit 3 of C18/CNCR is set to high.
In broadcast case, to accept a packet with a broadcast destination address, the bit 5 of C18/CNCR must
be set to high. Otherwise, the W89C840AF will reject this broadcast packet.
In multicast case, a packet with a multicast destination address will be accepted if the destination
address is grouped into the selected group specified by the registers of C38/CMA0 and C3C/CMA1. These two
registers are used to store the group mapping for the multicast packet.
The following table shows the group mapping relationship between the groups and the contents of
C38/CMA0 and C3C/CMA1. It is obviously shown that each bit in the registers C38/CMA0 and C3C/CMA1
represents one group.
Bit 31~ 24
Bit 23 ~ 16
Bit 15 ~ 8
Bit 7 ~ 0
C38/CMA0
Group 32 ~ 25
Group 24 ~ 17
Group 16 ~ 9
Group 8 ~ 1
C3C/CMA1
Group 64 ~ 57
Group 56 ~ 49
Group 48 ~ 40
Group 39 ~ 33
相關PDF資料 |
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|---|---|
| W89C841F | 3-IN - 1 10/100M FAST ETHERNET CONTROLLER |
| W89C880F | 100Base-Tx/T4 Multiport Repeater Controller(100Base-Tx/T4多端口中繼器控制器) |
| W89C92 | PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER |
| W89C926 | PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER |
| W89C926F | 10M PCMCIA Ethernet Network Interface Controller |
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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