• 參數(shù)資料
    型號(hào)： RM5231A-250-H
    廠商： PMC-SIERRA INC
    元件分類： 微控制器/微處理器
    英文描述： RM5231A⑩ Microprocessor with 32-Bit System Bus Data Sheet Preliminary
    中文描述： 64-BIT, 250 MHz, MICROPROCESSOR, PQFP128
    封裝： MQFP-128
    文件頁(yè)數(shù)： 24/40頁(yè)
    文件大?。?/td> 595K
    代理商： RM5231A-250-H
    Proprietary and Confidential to PMC-Sierra, Inc and for its Customer’s Internal Use
    Document ID: PMC-2002174, Issue 2
    24
    RM5231A Microprocessor with 32-Bit System Bus Data Sheet
    Preliminary
    Figure 7 Processor Block Read
    Figure 8 Processor Block Write
    3.26 Enhanced Write Modes
    The RM5231A implements two enhancements to the original R4000 write mechanism: Write
    Reissue and Pipeline Writes. The original R4000 allowed a write address cycle on the
    SysAD
    bus
    only once every four SysClock cycles. Hence for a non-block write, this meant that two out of
    every four cycles were wait states.
    Pipelined write mode eliminates these two wait states by allowing the processor to drive a new
    write address onto the bus immediately after the previous write data cycle. This allows for higher
    SysAD
    bus utilization. However, at high bus frequencies the processor may drive a subsequent
    write onto the bus prior to the time the external agent deasserts
    WrRdy*
    , indicating that it can not
    accept another write cycle. This can cause the write cycle to be missed.
    Write reissue mode is an enhancement to pipelined write mode and allows the processor to reissue
    missed write cycles. If
    WrRdy*
    is deasserted during the issue phase of a write operation, the cycle
    is aborted by the processor and reissued at a later time.
    SysClock
    SysAD
    SysCmd
    ValidOut*
    ValidIn*
    RdRdy*
    WrRdy*
    Release*
    Addr
    Data0
    Data1
    Data2
    Data3
    Data4
    Data5
    Data6
    Data7
    Read
    NData
    NData
    NData
    NData
    NData
    NData
    NData
    NEOD
    SysClock
    SysAD
    SysCmd
    ValidOut*
    ValidIn*
    RdRdy*
    WrRdy*
    Release*
    Addr
    Data0
    Data1
    Data2
    Data3
    Data4
    Data5
    Data6
    Data7
    Write
    NData
    NData
    NData
    NData
    NData
    NData
    NData
    NEOD
    相關(guān)PDF資料
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