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<hr><p align="left"><small>发信人: plato (纯真年代), 信区: Embedded <br>
标 题: linux for ppc chapter 22 (last) <br>
发信站: BBS 水木清华站 (Wed May 30 23:26:13 2001) <br>
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22. Glossary <br>
22.1 ABI - Application Binary Interface <br>
The convention for register usage and C linkage commonly used on desktop Pow <br>
erPC machines. Similar, but not identical to the EABI. <br>
22.2 BDM - Background Debug Mode <br>
An on-chip debugging interface, largely eliminating the need for expensive I <br>
n Circuit Emulators. <br>
22.3 CPM - Communications Processor Module <br>
The magic communications co-processor in Motorola PowerQUICC devices. It con <br>
tains SCCs and SMCs , and performs SDMA and IDMA. <br>
22.4 CPU - Central Processor Unit <br>
Depending on the context, this may refer to the PowerPC core itself, or the <br>
physical processor device (including CPM, SIU, packaging etc) as a single un <br>
it. <br>
22.5 DMA - Direct Memory Access <br>
A form a data transfer directly between memory and a peripheral or between m <br>
emory and memory, without normal program intervention. <br>
22.6 EABI - Embedded Application Binary Interface <br>
The convention for register usage and C linkage commonly used on embedded Po <br>
werPC machines, derived from the ABI. <br>
22.7 FEC - Fast Ethernet Controller <br>
The 100 Mbps (100Base) Ethernet controller, present on 'T' devices such as t <br>
he 860T and 855T. <br>
22.8 GPL/LGPL - GNU General Public License/Lesser General Public License <br>
http://www.gnu.org/copyleft/gpl.html <br>
The licenses under which the Linux kernel and much of the utility and librar <br>
y code necessary to build a complete system may be copied, distributed and m <br>
odified. Each portion of the software is copyright by its respected copyrigh <br>
t holder, and you must comply with the terms of the license in order to lega <br>
lly copy (and hence use) it. One significant requirement is that you freely <br>
redistribute any modifications you make; if you can't cope with this, embedd <br>
ed Linux isn't for you. <br>
22.9 IDMA - Independent DMA <br>
A general purpose DMA engine with relatively limited throughput provided by <br>
the microcoded CPM, for use with external peripherals or memory-to-memory tr <br>
ansfers. <br>
22.10 MII - Media Independent Interface <br>
The IEEE Ethernet standard control interface used to communicate between the <br>
on-chip Ethernet controller and the external PHY. <br>
22.11 MMU - Memory Management Unit <br>
CPU component which maps kernel- and user-space virtual addresses to physica <br>
l addresses, and is an integral part of Linux kernel operation. <br>
22.12 PHY - Physical Interface <br>
The IEEE Ethernet standard interface between the external physical layer tra <br>
nsceiver and the on-chip ethernet controller in a PowerQUICC device. Often u <br>
sed to refer to the external transceiver itself, the PHY is controlled more <br>
or less transparently to software via the MII. <br>
22.13 SCC - Serial Communications Controller <br>
The high performance module(s) within the CPM which implement the lowest lay <br>
er of various serial protocols, such as Asynchronous serial ( UART), 10 Mbps <br>
Ethernet, HDLC etc. <br>
22.14 SDMA - Serial DMA <br>
DMA used to transfer data to and from the SCCs. <br>
22.15 SIU - System Interface Unit <br>
Provides much of the external interfacing logic. It's the other major module <br>
on Motorola PowerQUICC devices alongside the CPU core and CPM. <br>
22.16 SPI - Serial Peripheral Interface <br>
A relatively simple synchronous serial interface for connecting low speed ex <br>
ternal devices using minimal wires. <br>
22.17 SMC - Serial Management Controller <br>
A lower performance version of the SCCs with more limited functionality, par <br>
ticularly useful for serial debug ports and low throughput serial protocols. <br>
<br>
22.18 UART - Universal Asynchronous Receiver Transmitter <br>
Generically, this refers to any device capable of implementing a variety of <br>
asynchronous serial protocols, such as RS-232, HDLC and SDLC. In this contex <br>
t, it refers to the operating mode of the SCCs which provides this functiona <br>
lity. <br>
22.19 UPM - User Programmable Machine <br>
A highly flexible bus interfacing machine unit allowing external peripherals <br>
with an extremely wide variety of interfacing requirements to be connected <br>
directly to the CPU. <br>
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