參數(shù)資料
型號： 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)： 68/128頁
文件大?。?/td> 641K
代理商： MC68LC302PU20CT
ETHERNET Controller
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-5
of space to be available in the transmit FIFO prior to beginning a DMA burst into the
MC68EN302 transmit FIFO. WMRK is typically set to 16.
WMRK1–WMRK0, when used in conjunction with BLIM2–BLIM0, allows the system
designer to configure the MC68EN302 device for expected bus latency.
BLIM2–BLIM0—Burst Limit. (R/W)
BLIM2–BLIM0 controls the maximum length of a DMA burst in accesses from the bus
interface unit. BLIM is typically set to 8 for 16 bit systems.
000 = 1 Access
001 = 2 Accesses
010 = 4 Accesses
011 = 8 Accesses
100 = 16 Accesses
101 = 32 Accesses
110 = 64 Accesses
111 = Unlimited
4.1.3 ETHERNET MAXIMUM RECEIVE BUFFER LENGTH (EMRBLR)
The EMRBLR register determines the maximum size of all receive buffers. Because the
maximum frame is limited to 1518, only bits 10–0 are written by the user. The value written
into the maximum receive buffer length register must account for the receive CRC which is
always written into the last receive buffer. To allow one maximum size frame per buffer,
EMRBLR must be set to 0000010111101110 or larger. The EMRBLR must be evenly
divisible by 2. To ensure this, bit 0 is forced low. Only non-zero values are considered to be
valid, therefore this register should be written after reset, but before Ethernet operation is
enabled. All implemented bits are R/W. This register is cleared upon a hardware reset.
5–11—Reserved.
Should be written to zero by the host processor. These bits are always read as zero.
MRBL—Maximum receive buffer length.
Must be programmed to a non-zero value for operation.
0—Reserved.
Must be written as zero by the host processor. This bit is always read as zero.
15
14
13
12
11
10
9876543210
00000
MAXIMUM RECEIVE BUFFER LENGTH
0
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相關代理商/技術參數(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 標準包裝:2 系列:MPC8xx 處理器類型:32-位 MPC8xx PowerQUICC 特點:- 速度:133MHz 電壓:3.3V 安裝類型:表面貼裝 封裝/外殼:357-BBGA 供應商設備封裝: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 最大時鐘頻率:536 MHz 程序存儲器大小: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 最大時鐘頻率:90 MHz 程序存儲器大小: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 最大時鐘頻率:90 MHz 程序存儲器大小: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 安裝風格:SMD/SMT
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