AT91SAM9261 datasheet(13/43 Pages) ATMEL

13 / 43 page

6062KS–ATARM–15-Jan-09

AT91SAM9261 Preliminary

Processor and Architecture

7.1

ARM926EJ-S Processor

• RISC Processor Based on ARM v5TEJ Architecture with Jazelle technology for Java

acceleration

• Two Instruction Sets

– ARM High-performance 32-bit Instruction Set

– Thumb High Code Density 16-bit Instruction Set

• DSP Instruction Extensions

• 5-Stage Pipeline Architecture:

– Instruction Fetch (F)

– Instruction Decode (D)

– Execute (E)

– Data Memory (M)

– Register Write (W)

• 16 Kbyte Data Cache, 16 Kbyte Instruction Cache

– Virtually-addressed 4-way Associative Cache

– Eight words per line

– Write-through and Write-back Operation

– Pseudo-random or Round-robin Replacement

• Write Buffer

– Main Write Buffer with 16-word Data Buffer and 4-address Buffer

– DCache Write-back Buffer with 8-word Entries and a Single Address Entry

– Software Control Drain

• Standard ARM v4 and v5 Memory Management Unit (MMU)

– Access Permission for Sections

– Access Permission for large pages and small pages can be specified separately for

each quarter of the page

– 16 embedded domains

• Bus Interface Unit (BIU)

– Arbitrates and Schedules AHB Requests

– Separate Masters for both instruction and data access providing complete AHB

system flexibility

– Separate Address and Data Buses for both the 32-bit instruction interface and the

32-bit data interface

– On Address and Data Buses, data can be 8-bit (Bytes), 16-bit (Half-words) or 32-bit

(Words)

AT91SAM9261 датащи(PDF) 13 Page - ATMEL Corporation