目录

8.21.2

8.21.3

8.21.4

8.21.5

8.21.6

8.21.7

9.

例外Types.................................................................................................................... 8-25

异常陷阱处理............................................... .................................................. ... 8-26

旗..................................................................................................................................... 8-26

FPU异常.................................................................................................................... 8-27

保存和恢复状态.............................................. .................................................. 8-30 ....

陷阱处理程序的IEEE标准754例外........................................... ...................... 8-30

初始化界面....................................................................................................................... 9-1

9.1

功能概述..................................................................................................................... 9-1

9.1.1

系统Coordination............................................................................................................... 9-1

9.2

复位信号说明................................................................................................................ 9-2

9.2.1

上电Reset....................................................................................................................... 9-2

9.2.2

冷Reset............................................................................................................................... 9-3

9.2.3

软复位................................................................................................................................ 9-4

9.3

用户可选模式配置............................................. ............................................... 9-5

9.3.1

系统总线接口Modes.................................................................................................... 9-5

9.3.2

时钟分频的系统总线............................................ ................................................ 9-五

9.3.3

系统Endianness.................................................................................................................. 9-5

9.3.4

启用和禁用定时器中断............................................ ................................ 9-5

9.3.5

系统总线宽度设置....................................................................................................... 9-5

时钟接口................................................................................................................................ 10-1

10.1信号Terminology...................................................................................................................... 10-1

10.2基本系统时钟.................................................................................................................... 10-2

10.2.1 MasterClock.......................................................................................................................... 10-2

10.2.2 CPUCLK.............................................................................................................................. 10-2

10.2.3 GBUSCLK ........................................................................................................................... 10-2

10.2.4 CPUCLK到GBUSCLK司......................................... ................................................ 10 3

10.2.5锁相环（ PLL ） ........................................ .................................................. .......... 10-3

10.3连接到时钟锁相环系统......................................... ..................................... 10-4

TX4956系统Interface................................................................................................................. 11-1

11.1 Introduction................................................................................................................................. 11-1

的R5000型协议模式系统接口的11.2说明........................................ .......... 11-1

11.2.1接口总线......................................................................................................................... 11-2

11.2.2地址周期和数据周期.......................................... .................................................. ... 11-2

11.2.3发行周期............................................................................................................................ 11-3

11.2.4握手Signal.................................................................................................................. 11-4

的R5000型11.2.5系统接口协议......................................... ..................................... 11-4

11.2.6处理器的请求和外部请求.......................................... ................................... 11-6

11.2.7处理请求的.......................................................................................................... 11-10

11.2.8处理器请求和外部请求协议......................................... ...................... 11-12

11.2.9数据传输...................................................................................................................... 11-25

11.2.10系统接口周期时间........................................... .................................................. .. 11-26

11.2.11系统接口命令和数据标识符......................................... ........................ 11-27

11.2.12系统接口地址............................................ .................................................. ... 11-32

系统界面11.2.13模式寄存器（ G2SConfig ） ....................................... ........................... 11-32

11.2.14数据错误Detection........................................................................................................... 11-33

的R4300型协议模式11.3系统接口.......................................... .............................. 11-34

11.3.1系统接口描述R4300型协议模式....................................... ........ 11-34

11.3.2系统事件..................................................................................................................... 11-38

11.3.3系统事件序列和的SysAD总线协议....................................... .................. 11-38

11.3.4系统接口协议............................................ .................................................. .... 11-41

11.3.5时序总结................................................................................................................ 11-43

11.3.6仲裁.......................................................................................................................... 11-47

11.3.7发行Commands.............................................................................................................. 11-48

11.3.8处理器写Request...................................................................................................... 11-48

11.3.9处理器读Request....................................................................................................... 11-50

11.3.10外部写请求....................................................................................................... 11-50

11.3.11外部读取响应...................................................................................................... 11-52

11.3.12流Control....................................................................................................................... 11-54

10.

11.

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