AN2407 查看數據表（PDF） - Freescale Semiconductor

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AN2407

Reed Solomon Encoder/Decoder on the StarCore™ SC140/SC1400 Cores, With Extended Examples

Freescale Semiconductor 

Unified

Data/Program Memory

128

32

32 32

64 64

SC140 Core Overview

128

Program

Sequencer

Address Generator

Register File

2 AAUs

Instruction Bus

BMU

Data ALU

Register File

EOnCE

Power

Management

4 ALUs

128

Clock

Generator

PLL

Instruction Set

Accelerator

24

Figure 5. SC140 Core

The SC140 core provides the following main functional units:

• Data-arithmetic and logic unit (DALU) that includes four data-arithmetic and logic units (ALU) and a

bank of sixteen 40-bit registers, d0 to 15.

• Address-generation unit (AGU):

— :Sixteen 32-bit address read/write registers, r0 to r15. The contents of an address register can either

point directly to data or function as an index.

— Two AAUs, each of which can update one address register during one instruction cycle.

• Program sequencer and controller (PSEQ).

• Memory interface:

— A 32-bit program memory address bus (PAB) and a 128-bit program memory data bus (PDB).

— Two data memory buses (32-bit address and 64-bit data bus pairs: XABA and XDBA, XABB, and

XDBB).

The SC140 core uses a unified memory space. Each address can contain either program information or data. There

are no separate memory spaces for program locations and data locations. The memory is made up of a number of

32 KB groups, and each group includes eight 4 KB modules. Memory contention, which causes a one-cycle stall,

can arise if two data accesses are to two different rows in the same memory module. The instruction set supports

various types of move instructions that differ in access width (byte, word, long word, two long words), data type

(signed, unsigned) and multiple-register moves. Integer moves from memory (byte, word, long, two long) are right

aligned in the destination register, and by default are sign-extended to the left. Unsigned moves are marked with

Reed Solomon Encoder/Decoder on the StarCore™ SC140/SC1400 Cores, With Extended Examples, Rev. 1

Freescale Semiconductor

11

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