- 您现在的位置：买卖IC网 > PDF目录80429 > MC68302FC20CR2 (FREESCALE SEMICONDUCTOR INC) 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132 PDF资料下载
参数资料
| 型号： | MC68302FC20CR2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132 |
| 封装： | 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132 |
| 文件页数： | 88/128页 |
| 文件大小： | 641K |
| 代理商： | MC68302FC20CR2 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页当前第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页
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.
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC000RC12 | 32-BIT, 12 MHz, MICROPROCESSOR, CPGA68 |
| MC68HC05B32B | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| MC68HC705B16CFU | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC705P6AVP | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| MC68HC711K4MFU2 | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68302FC25 | 制造商:MOTOROLA 制造商全称: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 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M683xx 标准包装:2 系列:MPC8xx 处理器类型:32-位 MPC8xx PowerQUICC 特点:- 速度:133MHz 电压:3.3V 安装类型:表面贴装 封装/外壳:357-BBGA 供应商设备封装:357-PBGA（25x25） 包装:托盘 |
| MC68302FE16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Communications Controller |
| MC68302FE16C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Communications Controller |
| MC68302FE20 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Communications Controller |
发布紧急采购，3分钟左右您将得到回复。