Embedded 版 (精华区)
发信人: he (无情的雨), 信区: Embedded_system
标 题: linux for ppc chapter 22 (last)
发信站: 哈工大紫丁香 (2001年06月04日11:12:15 星期一), 站内信件
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22. Glossary
22.1 ABI - Application Binary Interface
The convention for register usage and C linkage commonly used on desktop Pow
erPC machines. Similar, but not identical to the EABI.
22.2 BDM - Background Debug Mode
An on-chip debugging interface, largely eliminating the need for expensive I
n Circuit Emulators.
22.3 CPM - Communications Processor Module
The magic communications co-processor in Motorola PowerQUICC devices. It con
tains SCCs and SMCs , and performs SDMA and IDMA.
22.4 CPU - Central Processor Unit
Depending on the context, this may refer to the PowerPC core itself, or the
physical processor device (including CPM, SIU, packaging etc) as a single un
it.
22.5 DMA - Direct Memory Access
A form a data transfer directly between memory and a peripheral or between m
emory and memory, without normal program intervention.
22.6 EABI - Embedded Application Binary Interface
The convention for register usage and C linkage commonly used on embedded Po
werPC machines, derived from the ABI.
22.7 FEC - Fast Ethernet Controller
The 100 Mbps (100Base) Ethernet controller, present on 'T' devices such as t
he 860T and 855T.
22.8 GPL/LGPL - GNU General Public License/Lesser General Public License
http://www.gnu.org/copyleft/gpl.html
The licenses under which the Linux kernel and much of the utility and librar
y code necessary to build a complete system may be copied, distributed and m
odified. Each portion of the software is copyright by its respected copyrigh
t holder, and you must comply with the terms of the license in order to lega
lly copy (and hence use) it. One significant requirement is that you freely
redistribute any modifications you make; if you can't cope with this, embedd
ed Linux isn't for you.
22.9 IDMA - Independent DMA
A general purpose DMA engine with relatively limited throughput provided by
the microcoded CPM, for use with external peripherals or memory-to-memory tr
ansfers.
22.10 MII - Media Independent Interface
The IEEE Ethernet standard control interface used to communicate between the
The IEEE Ethernet standard control interface used to communicate between the
on-chip Ethernet controller and the external PHY.
22.11 MMU - Memory Management Unit
CPU component which maps kernel- and user-space virtual addresses to physica
l addresses, and is an integral part of Linux kernel operation.
22.12 PHY - Physical Interface
The IEEE Ethernet standard interface between the external physical layer tra
nsceiver and the on-chip ethernet controller in a PowerQUICC device. Often u
sed to refer to the external transceiver itself, the PHY is controlled more
or less transparently to software via the MII.
22.13 SCC - Serial Communications Controller
The high performance module(s) within the CPM which implement the lowest lay
er of various serial protocols, such as Asynchronous serial ( UART), 10 Mbps
Ethernet, HDLC etc.
22.14 SDMA - Serial DMA
DMA used to transfer data to and from the SCCs.
22.15 SIU - System Interface Unit
Provides much of the external interfacing logic. It's the other major module
on Motorola PowerQUICC devices alongside the CPU core and CPM.
22.16 SPI - Serial Peripheral Interface
A relatively simple synchronous serial interface for connecting low speed ex
ternal devices using minimal wires.
22.17 SMC - Serial Management Controller
A lower performance version of the SCCs with more limited functionality, par
ticularly useful for serial debug ports and low throughput serial protocols.
22.18 UART - Universal Asynchronous Receiver Transmitter
Generically, this refers to any device capable of implementing a variety of
asynchronous serial protocols, such as RS-232, HDLC and SDLC. In this contex
t, it refers to the operating mode of the SCCs which provides this functiona
lity.
22.19 UPM - User Programmable Machine
A highly flexible bus interfacing machine unit allowing external peripherals
with an extremely wide variety of interfacing requirements to be connected
directly to the CPU.
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