- 您现在的位置：买卖IC网 > PDF目录80565 > M68LC302CPU20VCT (FREESCALE SEMICONDUCTOR INC) 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP100 PDF资料下载
参数资料
| 型号： | M68LC302CPU20VCT |
| 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, PQFP100 |
| 封装： | 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-100 |
| 文件页数： | 79/128页 |
| 文件大小： | 641K |
| 代理商： | M68LC302CPU20VCT |
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页当前第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
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-15
LG—Rx Frame Length Violation, written by Ethernet controller.
A frame length greater than 1520 (maximum allowed receive frame length) was recognized.
In this situation, note that only the first 1520 bytes are written to the data buffer. This bit is
valid only if the L-bit is set. This frame should be discarded.
NO—Rx Nonoctet Aligned Frame, written by Ethernet controller.
The received frame contained a number of bits which is not a multiple of 8, and the CRC
check that occurred at the preceding byte boundary generated an error. This bit is valid only
if the L-bit is set. If this bit is set, the CR bit will not be set. This frame should be discarded.
SH—Short Frame, written by Ethernet controller.
The MC68EN302 does not support SH and this bit is always cleared. This bit indicates that
a frame length less than the minimum defined for this channel was recognized. This frame
should be discarded.
CR—Rx CRC Error, written by Ethernet controller.
This frame contains a CRC error and is an integral number of octets in length. This bit is
valid only if the L-bit is set. This frame should be discarded.
OV—Overrun, written by Ethernet controller.
A receive FIFO overrun occurred during frame reception. During a FIFO overflow, the status
bits also in this word (M, LG, NO, SH, CR, and CL) lose their normal meaning and are zero.
This bit is valid only if the L-bit is set. This frame should be discarded.
CL—Collision, written by Ethernet controller.
A collision occurred during frame reception and the frame was closed. This bit is set only if
a late collision occurred. This bit is valid only if the L-bit is set. This frame should be
discarded.
Data Length, written by Ethernet controller.
Data length indicates the number of octets written by the Ethernet controller into this BD’s
data buffer. It is written by the Ethernet controller upon the close of this BD.
Reason and ARIndex, written by Ethernet controller.
If INDEX_EN=1 in the AR_CNTRL register, then the Reason and ARIndex fields replace the
most significant byte of the Rx Buffer Pointer. The Reason and ARIndex are available on all
buffer descriptors for a frame when INDEX_EN is set, independent of the condition of the L
and F bits. When INDEX_EN = 0 the Reason and ARIndex fields are not modified by
hardware.
Rx Buffer Pointer, written by user.
The receive buffer pointer always points to the first location of the associated data buffer and
must be a multiple of 2. The data buffer must reside in memory external to the Ethernet
controller. When INDEX_EN=1, the most significant byte of the receive buffer pointer is
replaced by a reason and index field. When INDEX_EN=0, the receive buffer pointer is not
modified. See 4.6.1 Buffer Descriptor Modification for more details.
相关PDF资料 |
PDF描述 |
|---|---|
| MC68030FE25C | 32-BIT, 25 MHz, MICROPROCESSOR, CQFP132 |
| MC68302CPV16VC | 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144 |
| MC68331CFC16B1 | 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132 |
| MC68882CRC16A | 32-BIT, MATH COPROCESSOR, CPGA68 |
| MC68HC11E1VFN3 | 8-BIT, 3 MHz, MICROCONTROLLER, PQCC52 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M68LGL061X | 制造商:Panasonic Industrial Company 功能描述:SUB ONLY CRT |
| M68LGL061XA | 制造商:Panasonic Industrial Company 功能描述:CRT OR M68LGL061X |
| M68LNK161X | 制造商:Panasonic Industrial Company 功能描述:CRT |
| M68LUQ085X | 制造商:Panasonic Industrial Company 功能描述:CRT |
| M68LZP195X | 制造商:Panasonic Industrial Company 功能描述:CRT |
发布紧急采购，3分钟左右您将得到回复。