參數(shù)資料
型號(hào)： MC68LC302PU20CT
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, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-100
文件頁數(shù)： 84/128頁
文件大?。?/td> 641K
代理商： MC68LC302PU20CT
ETHERNET Controller
4-20
MC68EN302 REFERENCE MANUAL
MOTOROLA
The transmit FIFO control logic provides a signal indicating data is available to the Ethernet
transmit protocol machine. If underflow occurs, the Ethernet transmit protocol machine will
handle aborting the frame (append a bad CRC) and flushing the remainder of the frame from
the FIFO.
If a collision occurs within the slot time in a transmit frame, the FIFO supports retry by
maintaining a separate start of frame pointer (read lag pointer). New data is never written on
top of start of frame data until the slot time has passed. Two control signals pass between
the Ethernet transmit logic and the transmit FIFO to indicate when the slot time (collision
window) has been passed (Transmit Accept) or when a collision retry must take place
(Transmit Retry).
4.4.2 RECEIVE FIFO
The receive FIFO control logic provides “data available” and “receive FIFO empty” flow
control signals to the receive DMA controller. The “data available” signal is asserted as a
function of the number of bytes available in the FIFO and the WMRK bits from the EDMA
register. If overflow occurs, the STATUS word will have the OU bit set which will be written
into the receive BD. The frame should be discarded by software.
Data is written into the receive FIFO by the Ethernet receive logic in the case of status
information, and by the address recognition logic if the Reason and ARIndex fields are
enabled.
The receive FIFO control logic maintains a “start of frame” pointer that allows purging
collision fragments from the FIFO so that they need not be DMA’d. This purging of fragments
(runt frames less than 64 bytes long) is automatic and cannot be disabled.
4.5 ETHERNET PROTOCOL LOGIC
This block implements the MAC (media access control) sublayer of the IEEE 802.3
standard, supporting operation up to 10 Mbps compliant with both Ethernet and 802.3
standards. This logic is subdivided into transmit, receive and loopback/serial interface
sections.
4.5.1 ETHERNET TRANSMIT
The Ethernet transmiter block performs the following functions:
Parallel to serial conversion of data
Encapsulation of transmit frames
— Generation of preamble (PA) and start of frame delimiter (SFD)
— Transmits serial data from the transmit FIFO interface
— Pads short frames (with 0’s)
— Appends CRC, if required
— Appends bad CRC if required
— Appends JAM pattern (all 1’s)
Transmit Protocol
相關(guān)PDF資料
PDF描述
MC68EN302PV25BT 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
MC68302PV33C 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
SPAK302PV16VC 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
SPAK302FC25C 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132
MC68EN360EM25 7 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP240
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68LC302PU20VCT 功能描述:IC MPU NETWORK 20MHZ 100-LQFP 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
MC68LC302PU25CT 功能描述:微處理器 - MPU 25MHz 2.5MIPS RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MC68LK332ACAG16 功能描述:32位微控制器 - MCU 32BIT MCU 2KRAM TPU QSM RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
MC68LK332ACAG16 制造商:Freescale Semiconductor 功能描述:Microcontroller
MC68LK332ACEH16 功能描述:32位微控制器 - MCU 32BIT MCU 2KRAM TPU QSM RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*