參數(shù)資料
型號: Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 6/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
6
Microarchitecture
Integer Execution Unit
The 21164 provides two optional translation extensions called superpages. Access to
superpages is allowed only while executing in privileged mode.
One superpage maps virtual address bits <39:13> to physical address bits
<39:13>, on a one-to-one basis, when virtual address bits <42:41> equal 2.
The other superpage maps virtual address bits <29:13> to physical address bits
<29:13>, on a one-to-one basis, and forces physical address bits <39:30> to 0
when virtual address bits <42:30> equal 1FFE(hex).
3.1.4 Interrupts
The IDU exception logic supports three sources of interrupts:
Hardware interrupts
There are seven level-sensitive hardware interrupt sources supplied by the
following signals:
irq_h<3:0>
sys_mch_chk_irq_h
pwr_fail_irq_h
mch_halt_irq_h
Software interrupts
There are 15 prioritized software interrupts sourced by an onchip internal pro-
cessor register (IPR).
Asynchronous system traps
There are four asynchronous system traps (ASTs) controlled by onchip IPRs.
Most interrupts can be independently masked in onchip enable registers. In addi-
tion, AST interrupts are qualified by the current processor mode. All interrupts
are disabled when the processor is executing PALcode.
3.2 Integer Execution Unit
The integer execution unit (IEU) contains two 64-bit integer execution pipelines—
E0 and E1, which include the following:
Two adders
Two logic boxes
A barrel shifter
Byte-manipulation logic
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