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参数资料
| 型号： | RM5261A-300H |
| 厂商： | PMC-SIERRA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 64-BIT, 300 MHz, MICROPROCESSOR, PQFP208 |
| 封装： | HEAT SPREADER, MQFP-208 |
| 文件页数： | 9/42页 |
| 文件大小： | 898K |
| 代理商： | RM5261A-300H |
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Proprietary and Confidential to PMC-Sierra, Inc and for its Customer’s Internal Use
17
Document ID: PMC-2002240, Issue 1
RM5261A Microprocessor with 64-Bit System Bus Data Sheet
Preliminary
3.13 Virtual to Physical Address Mapping
The RM5261A provides three modes of virtual addressing:
user mode
kernel mode
supervisor mode
This mechanism allows system software to provide a secure environment for user processes. Bits
in the CP0 register Status determine which virtual addressing mode is used. In the user mode, the
RM5261A provides a single, uniform virtual address space of 1 TB (2 GB in 32-bit mode).
When operating in the kernel mode, four distinct virtual address spaces, totalling over 2.5 TB (4
GB in 32-bit mode), are simultaneously available and are differentiated by the high-order bits of
the virtual address.
The RM5261A processors also support a supervisor mode in which the virtual address space over
2 TB (2.5 GB in 32-bit mode), divided into three regions based on the high-order bits of the virtual
address.
When the RM5261A is configured as a 64-bit microprocessor, the virtual address space layout is
an upward compatible extension of the 32-bit virtual address space layout.
Figure 5 shows the address space layout for 32-bit operation
Figure 5
Kernel Mode Virtual Addressing (32-bit)
0xFFFFFFFF
Kernel virtual address space
(kseg3)
Mapped, 0.5GB
0xE0000000
0xDFFFFFFF
Supervisor virtual address space
(ksseg)
Mapped, 0.5GB
0xC0000000
0xBFFFFFFF
Uncached kernel physical address space
(kseg1)
Unmapped, 0.5GB
0xA0000000
0x9FFFFFFF
Cached kernel physical address space
(kseg0)
Unmapped, 0.5GB
0x80000000
0x7FFFFFFF
User virtual address space
(kuseg)
Mapped, 2.0GB
0x00000000
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RM5261A-300HI-B002 | 制造商:PMC Sierra from Components Direct 功能描述:MICROPROCESSOR 64-BIT 300MHZ 0.18UM TECHNOLOGY - Trays 制造商:PMC-Sierra 功能描述:PMC SIERRA RM5261A-300HI-B002, Microprocessor 64-Bit 300MHz 0.18um Technology 3.3V 208-Pin MQFP |
| RM5261A-300J-B002 | 制造商:PMC Sierra from Components Direct 功能描述:RM5261A-300J-B002, MICROPROCESSOR 64-BIT 300MHZ 0.18UM TECHN - Trays 制造商:PMC SIERRA 功能描述:PMC SIERRA RM5261A-300J-B002, Microprocessor 64-Bit 300MHz 0.18um Technology 3.3V 208-Pin LFMQFP |
| RM5270-150S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:64-Bit Microprocessor |
| RM5270-200S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:64-Bit Microprocessor |
| RM5271-200S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:64-Bit Microprocessor |
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