3HAC026222-003，3HAC026222-003

3HAC026222-003

 

3HAC026222-003
 
聯(lián)想存儲器用于地址聯(lián)想，有與高速存儲器相同行數(shù)和列數(shù)的存儲單元。當(dāng)主存儲器某一列某一行存儲單元組調(diào)入高速存儲器同一列某一空著的存儲單元組時，與聯(lián)想存儲器對應(yīng)位置的存儲單元就記錄調(diào)入的存儲單元組在主存儲器中的行號。
 
當(dāng)中央處理器存取主存儲器時，硬件首先自動對存取地址的列號字段進(jìn)行譯碼，以便將聯(lián)想存儲器該列的全部行號與存取主存儲器地址的行號字段進(jìn)行比較：若有相同的，表明要存取的主存儲器單元已在高速存儲器中，稱為命中，硬件就將存取主存儲器的地址映射為高速存儲器的地址并執(zhí)行存取操作；若都不相同，表明該單元不在高速存儲器中，稱為脫靶，硬件將執(zhí)行存取主存儲器操作并自動將該單元所在的那一主存儲器單元組調(diào)入高速存儲器相同列中空著的存儲單元組中，同時將該組在主存儲器中的行號存入聯(lián)想存儲器對應(yīng)位置的單元內(nèi)。
 
當(dāng)出現(xiàn)脫靶而高速存儲器對應(yīng)列中沒有空的位置時，便淘汰該列中的某一組以騰出位置存放新調(diào)入的組，這稱為替換。確定替換的規(guī)則叫替換算法，常用的替換算法有:近少使用算法（LRU）、先進(jìn)先出法（FIFO）和隨機(jī)法（RAND）等。替換邏輯電路就是執(zhí)行這個功能的。另外，當(dāng)執(zhí)行寫主存儲器操作時，為保持主存儲器和高速存儲器內(nèi)容的一致性，對命中和脫靶須分別處理。

INDUSTRIAL INDEXING MM-10-PLUS

ALLEN BRADLEY 2711-T9C9 SERIES C DISPLAY

LOT OF 2 LEEDS & NORTHRUP 080424 REV.C/G1 ANALOG OUTPUT

QUAD TECH 80188-286

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

INDUSTRIAL INDEXING MM-10-PLUS

ALLEN BRADLEY 2711-T9C9 SERIES C DISPLAY

LOT OF 2 LEEDS & NORTHRUP 080424 REV.C/G1 ANALOG OUTPUT

QUAD TECH 80188-286

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

INDUSTRIAL INDEXING MM-10-PLUS

ALLEN BRADLEY 2711-T9C9 SERIES C DISPLAY

LOT OF 2 LEEDS & NORTHRUP 080424 REV.C/G1 ANALOG OUTPUT

QUAD TECH 80188-286

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

LOT OF 95 FINDER 55.34.9.024.5080 RELAY

MICRO MOTION S100S138

SEALED ALLEN BRADLEY 1771-OBD SERIES C DATE CODE 12/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 10/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 5/08

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

LOT OF 95 FINDER 55.34.9.024.5080 RELAY

MICRO MOTION S100S138

SEALED ALLEN BRADLEY 1771-OBD SERIES C DATE CODE 12/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 10/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 5/08

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

LOT OF 95 FINDER 55.34.9.024.5080 RELAY

MICRO MOTION S100S138

SEALED ALLEN BRADLEY 1771-OBD SERIES C DATE CODE 12/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 10/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 5/08

 

 

RELIANCE ELECTRIC 78177-1X

TOSHIBA VT130G3U4025

VACON VACONX4C50020C AC DRIVE

ROSEMOUNT 3051CD2A02A1AS5

RELIANCE ELECTRIC 57C330C

ALLEN BRADLEY 512-BJA-25R SERIES D COMBINATION STARTER

ALLEN BRADLEY 120659 KIT PCB MAIN CONTROL
 

LOT OF 95 FINDER 55.34.9.024.5080 RELAY

MICRO MOTION S100S138

SEALED ALLEN BRADLEY 1771-OBD SERIES C DATE CODE 12/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 10/04

SEALED ALLEN BRADLEY 1771-IBD SERIES B DATE CODE 5/08