- 您现在的位置：买卖IC网 > PDF目录80495 > MC68302CRC16C (MOTOROLA INC) 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, CPGA132 PDF资料下载
参数资料
| 型号： | MC68302CRC16C |
| 厂商： | MOTOROLA 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, CPGA132 |
| 封装： | PGA-132 |
| 文件页数： | 76/128页 |
| 文件大小： | 641K |
| 代理商： | MC68302CRC16C |
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页当前第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
4-12
MC68EN302 REFERENCE MANUAL
MOTOROLA
PA_REJ—Physical address reject.
0 = Frames with physical addresses are accepted if there is a table match, either
perfect or hash.
1 = Frames with physical addresses are accepted if there is no perfect match. If a
physical address has a hash match but not a perfect match, the frame will be
accepted. This bit has no effect on frames with a multicast address.
PROM—Promiscuous mode.
0 = Frames are accepted only if they meet the hashing, perfect address match, or
MULT1–MULT0 criteria
1 = All frames are accepted regardless of address matching or settings of MULT1–
MULT0.
9–0—Reserved.
Should be written as zero by the host processor. These bits are always read as zero.
4.2 ETHERNET BUFFER DESCRIPTORS
The data for the Ethernet frames must reside in memory external to the MC68EN302 device
and is placed in one or more buffers. Buffer descriptors contain pointers to each buffer and
contain the current state of the buffer. The BDs are located inside the MC68EN302 in the
dual port Buffer Descriptor RAM so that the load on the processor bus is minimized.
Software “produces” buffers by allocating/initializing memory and initializing buffer
descriptors in the BDRAM. Setting the most significant bit (R for transmit and E for receive)
in the most significant word of the buffer descriptor initializes the buffer. MC68EN302 DMA
hardware constantly polls the BDs and processes the buffers after they have been
initialized. Processing in the case of transmit indicates that the data in the buffers has been
read into the MC68EN302 and transmitted out the Ethernet interface. Processing in the case
of receive indicates that data received from the Ethernet interface has been placed into data
buffers pointed to by the receive buffer descriptors. Once DMA is complete and the buffer
descriptor status bits have been written, the most signficant bit of the buffer descriptor is
cleared indicating that the buffer has been processed. Software may either poll the BDs or
may rely on the buffer/frame interrupts to detect when the buffers have been consumed.
The ETHER_EN signal operates as a reset to the BD/DMA logic. When ETHER_EN is
deasserted, the BD pointers are reset to point to the starting transmit and receive BDs. The
buffer descriptors are not initialized by hardware during reset. For proper operation, before
setting the ETHER_EN bit, initialize at least one transmit and receive buffer descriptor by
setting the most significant word of the descriptor to $0000 (this does not result in any
transmit or receive operation, but is considered to be initialization). Because the DMA polls
buffer descriptor memory to determine if the R/E bits in the next available BD are set
whenever ETHER_EN=1, initializing ‘n’ buffers, requires software to initialize n+1 buffer
descriptors, setting the most significant bit of the (n+1)th descriptor to 0.
相关PDF资料 |
PDF描述 |
|---|---|
| MC9S12DJ256CVFU | 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80 |
| MC68HC705C5CP | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP40 |
| M37471M8-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| M37478M4-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| M37478M8-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP56 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68302CRC20 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Integrated Multiprotocol Processor User’s Manual |
| MC68302CRC20C | 功能描述:微处理器 - MPU 68K INTGR COM PROC DMA RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MC68302EH16C | 功能描述:微处理器 - MPU 68K INTGR COM PROC DMA RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MC68302EH16C | 制造商:Freescale Semiconductor 功能描述:32-Bit Microcontroller IC |
| MC68302EH16CB1 | 功能描述:微处理器 - MPU 68K INTGR COM PROC DMA RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
发布紧急采购，3分钟左右您将得到回复。