MPC8540 datasheet(1263/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

Glossary-5

Integer unit. An execution unit in the core responsible for executing integer

instructions.

In-order. An aspect of an operation that adheres to a sequential model. An

operation is said to be performed in-order if, at the time that it is performed,

it is known to be required by the sequential execution model.

Instruction latency. The total number of clock cycles necessary to execute an

instruction and make ready the results of that instruction.

Kill. An operation that causes a cache block to be invalidated without writing any

modified data to memory.

Latency. The number of clock cycles necessary to execute an instruction and make

ready the results of that execution for a subsequent instruction.

L2 cache. Level-2 cache. See Secondary cache.

Least-significant bit (lsb). The bit of least value in an address, register, field, data

element, or instruction encoding.

Least-significant byte (LSB). The byte of least value in an address, register, data

element, or instruction encoding.

Little endian. A byte-ordering method in memory where the address n of a word

corresponds to the least-significant byte. In an addressed memory word, the

bytes are ordered (left to right) 3, 2, 1, 0, with 3 being the most-significant

byte. See Big endian.

Local access window. Mapping used to translate a region of memory to a particular

target interface, such as the DDR SDRAM controller or the PCI controller.

The local memory map is defined by a set of eight local access windows.

The size of each window can be configured from 4 Kbytes to 2 Gbytes.

Media access control (MAC) sublayer. Sublayer that provides a logical connection

between the MAC and its peer station. Its primary responsibility is to

initialize, control, and manage the connection with the peer station.

Medium-dependent interface (MDI) sublayer—Sublayer that defines different

connector types for different physical media and PMD devices.

MPC8540 Datasheet(PDF) 1263 Page - Freescale Semiconductor, Inc