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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)： | 80/128頁 |
| 文件大小： | 641K |
| 代理商： | MC68LC302PU20CT |
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ETHERNET Controller
4-16
MC68EN302 REFERENCE MANUAL
MOTOROLA
4.2.2 ETHERNET TRANSMIT BUFFER DESCRIPTOR
Transmit data is presented to the Ethernet controller through buffers referenced by transmit
Buffer Descriptors. The Ethernet controller confirms transmission operation through the R
bit, and indicates error conditions through the other status bits in the most signficant word
of the BD. The host software must initialize the R, W, I, L, TC, and (optionally) TO bits in the
first word, the length in the second word, and the buffer pointer in the third and fourth words.
.
Figure 4-3. Ethernet Transmit Buffer Descriptor (Tx BD)
The Tx BD fields are detailed below. The unused bits (15-8) in Offset + 4 are not used by
the hardware. These unused bits are R/W by software and are ignored by hardware.
R—Ready, written by Ethernet controller and user.
0 = The data buffer associated with this BD is not ready for transmission, leaving the
software free to manipulate this BD or its associated data buffer. The Ethernet
controller clears this bit after the buffer has been transmitted or after an error
condition is encountered.
1 = The data buffer, which has been prepared for transmission by the user, has not
been transmitted or is currently being transmitted. No fields of this BD may be
written after this bit is set.
TO—Transmit Buffer Software Ownership, written by user.
This bit is provided as a software ownership bit, if needed. Hardware does not alter the value
of this bit.
L— Last (Last BD for this frame)
0 = This is not the last BD for this frame and the Ethernet controller sets R= 0 when the
buffer has been DMA’d into the MC68EN302. Status bits are not modified.
1 = The Ethernet controller sets R = 0 and modifies the DEF, HB, LC, RL, RC, UN and
CSL status bits once the buffer has been DMA’d into the MC68EN302 and frame
transmission has completed
Offset + 0
Offset + 2
Offset + 4
Offset + 6
Tx Data Buffer Pointer - A15–A0
Data Length
CSL
UN
RL
LC
TC
L
I
W
TO
R
HB
DEF
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RC
A23–A16
Unused
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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 |
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