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参数资料
| 型号： | MC68302FC20CR2 |
| 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, PQFP132 |
| 封装： | 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132 |
| 文件页数： | 80/128页 |
| 文件大小： | 641K |
| 代理商： | MC68302FC20CR2 |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68302FC25 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Integrated Multiprotocol Processor User’s Manual |
| MC68302FC25C | 功能描述:IC MPU MULTI-PROTOCOL 132-PQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M683xx 标准包装:2 系列:MPC8xx 处理器类型:32-位 MPC8xx PowerQUICC 特点:- 速度:133MHz 电压:3.3V 安装类型:表面贴装 封装/外壳:357-BBGA 供应商设备封装:357-PBGA（25x25） 包装:托盘 |
| MC68302FE16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Communications Controller |
| MC68302FE16C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Communications Controller |
| MC68302FE20 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Communications Controller |
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