- 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： | 83/128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页第76页第77页第78页第79页第80页第81页第82页当前第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
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-19
operaton begins for the second frame as the frame status of the first frame is determined.
Frame status is not available until after the 4 microsecond heartbeat window at the end of
transmission.
When ETHER_EN changes from 0 to 1, the transmit process starts at Buffer Descriptor+
$C00 and the receiver begins processing BDs at offset $C40, $C80, $D00, or $E00
depending on BDSIZE. When GTS (graceful transmit stop) is set, the transmitter halts once
any unfinished transmit frames have completed transmission and the Buffer Descriptors
have been updated. The transmitter then generates a GRA interrupt. When GTS is cleared
(0), the transmitter begins transmission with the next frame in the transmit queue.
4.3.2 DMA LOGIC
The DMA block transfers data between the FIFOs and the data buffers that Buffer
Descriptors point to. The DMA block must arbitrate for access to the module bus. Once the
module bus controller has received a grant for the 68000 bus, a module bus grant is passed
to the DMA controller. The DMA controller alternates between transmit and receive DMA,
passing over either one if there is no outstanding data.
If there is receive data but no available buffer to place the data in, a BSY (BUSY) interrupt
is generated.
Once a data flow direction is chosen between transmit and receive, the DMA machine
continues to read a word or byte until it releases the bus and returns to the idle state. The
DMA machine will release the bus on any of the following conditions:
The burst limit counter is reached.
An end of frame (EOF) has been reached.
The receive FIFO has been emptied.
The transmit FIFO has been filled.
At the end of a buffer.
At the beginning or end of a buffer, a byte access occurs if necessary. Once the DMA
machine releases bus mastership, if additional data must be moved, the DMA machine
generates another bus request.
4.4 TRANSMIT AND RECEIVE FIFOS
The Ethernet controller contains separate 128-byte transmit and receive FIFOs organized
as 64 locations x 18 bits each with 16 bits for data and 2 for tag information. Each FIFO has
independent control logic allowing full duplex operation.
4.4.1 TRANSMIT FIFO
The transmit FIFO control logic provides flow control information to the transmit buffer
descriptor logic. The timing for new transmit DMAs depends upon the WMRK and TSRLY
bits in the EDMA register as well as the number of locations currently available in the FIFO.
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。