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參數(shù)資料
| 型號(hào)： | MC68302FC16CR2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132 |
| 封裝： | 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132 |
| 文件頁數(shù)： | 88/128頁 |
| 文件大?。?/td> | 641K |
| 代理商： | MC68302FC16CR2 |
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ETHERNET Controller
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-23
Broadcast and multicast frames may be either unconditionally accepted or unconditionally
rejected. Note that multicast frames may be conditionally accepted based on a matching
table entry, either perfect or hash. Refer to Figure 4-4 and Table 4-3 for broadcast and
multicast frame address recognition.
Physical addresses are compared to perfect-match entries and either accepted or rejected.
If no perfect match occurs, the addresses may then be accepted (but not rejected) on the
basis of a hash match. Refer to Figure 4-4 and Table 4-4 for physical address recognition.
A physical address, but not a multicast address, may be rejected on the basis of a perfect
match. A hash table match alone on a physical address is not sufficient to reject that frame.
The address recognition memory is not initialized at reset; the user must initialize it before
setting ETHER_EN in ECNTRL. Perfect-match entries which are unused should be set to
all 1’s (broadcast address) which is a safe value since broadcast frame handling occurs
independently of any table entries. Unused hashmode entry bits must be set to 0.
4.6.1 BUFFER DESCRIPTOR MODIFICATION
Index values and reason fields may be passed into the upper byte of the receive buffer
descriptor’s data pointer by setting the INDEX_EN bit. This may help improve software
efficiency. If INDEX_EN is cleared, the receive buffer descriptor data pointer is not modified
by the MC68EN302. If INDEX_EN is set, the index value and reason field will be written into
all the BDs of a frame.
There are four reasons, not counting promiscuous mode, which cause a frame to be
accepted:
1. The frame is a multicast or broadcast frame and the appropriate MULT bits are set.
2. A perfect address match occurs.
3. A hash match occurs.
4. No perfect match occurs, the frame has a physical, not multicast address, and the
PA_REJ bit is set.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68302FC20 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Integrated Multiprotocol Processor User’s Manual |
| MC68302FC20C | 功能描述:IC MPU MULTI-PROTOCOL 132-PQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微處理器 系列:M683xx 標(biāo)準(zhǔn)包裝:2 系列:MPC8xx 處理器類型:32-位 MPC8xx PowerQUICC 特點(diǎn):- 速度:133MHz 電壓:3.3V 安裝類型:表面貼裝 封裝/外殼:357-BBGA 供應(yīng)商設(shè)備封裝:357-PBGA（25x25） 包裝:托盤 |
| MC68302FC25 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Integrated Multiprotocol Processor User’s Manual |
| MC68302FC25C | 功能描述:IC MPU MULTI-PROTOCOL 132-PQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微處理器 系列:M683xx 標(biāo)準(zhǔn)包裝:2 系列:MPC8xx 處理器類型:32-位 MPC8xx PowerQUICC 特點(diǎn):- 速度:133MHz 電壓:3.3V 安裝類型:表面貼裝 封裝/外殼:357-BBGA 供應(yīng)商設(shè)備封裝:357-PBGA（25x25） 包裝:托盤 |
| MC68302FE16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller |
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