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MITSUBISHI MICROCOMPUTERSLETTER SYMBOLS FOR THE DYNAMIC PARAMETERSb) those that are characteristics of the memory.The letter symbols so far proposed for memory circuitsare listed in sub-clauses 3.1 and 3.2 below.All subscripts A should be in lower-case.3.1. Timi ng RequirementsThe letter symbols for the timing requirements of semiconductormemories are as follows:Cycle timeTermTime interval between two signal eventsFall timeHold timePrecharging timeRise timeRecovery timeRefresh time intervalSetup timeTransition timePulse duration (wid~h)3.2. CharacteristicsSubscriptThe letter symbols for the dynamic characteristics ofsemiconductor memories are as follows:Access timeCharacteristicDisable timeEnable timePropagation timeRecovery timeTransition timeValid timecdhpcrecrfsuwSubscriptadisenprecNote: Recovery time for use as a characteristic is limited to sense recovery time.4. SUBSCRIPTS BAND D(For Signal Name or Terminal Name)The letter symbols for the signal name or the name ofthe terminal are as given below.All subscripts Band D should be in upper-case.AddressClockSignal or terminalColumn addressColumn address strobeData inputData input/outputChip enablevSubscriptACCACASDDOEErasureOutput enableProgramERData output 0ReadRRow addressRARow address strobeRefreshReadIWriteChip selectWrite (write enable)GPRRASRFRWSWNote l' In the letter symbols for time intervals, bars over the subscripts, for exampleCAS, should not be used.2: It should be noted, when further letter symbols are chosen, that the subscriptshould not end with H, K, V, X, or Z. (See clause 5)3' If the same terminal, or signal, can be used for two functions (for exampleData input/output, Read!vVrite) the waveform should be labelled with thedual function, if appropriate, but the symbols for the dynamic parametersshould include only that part of the subscript relevant to the parameter.5. SUBSCRIPTS C AND E(For Transition of Signal)The following symbols are used to represent the level orstate of a signal:High logic levelLow logic levelTransition of signalValid steady-state level (either low or high)Unknown, changing, or 'don't care' levelHigh-impedance state of three-state outputSubscriptThe direction of transition is expressed by two letters,the direction being from the state represented by thefirst letter to that represented by the second letter, withthe letters being as given above.When no misunderstanding can occur, the first lettermay be omitted to give an abbreviated symbol for subscriptsC and E as indicated below.All subscripts C and E should be in upper-case.ExamplesHLVXZSubscriptFull AbbreviatedTransition from high level tolow level HL LTransition from low level tohigh level LH HTransition from unknown orchanging state to valid state XV VTransition from valid state tounknown or changing state VX XTransition from high-impedancestate to valid state ZV VNote:Since subscripts C and E may be abbreviated, and since subscripts Band Dmay contain an indeterminate number of letters, it is necessary to put therestriction on the subscripts Band D that they should not end with H, L,V. X, or Z, so as to avoid possible confusion.a• MITSUBISHI..... ELECTRIC1-11
MITSUBISHI MICROCOMPUTERSLETTER SYMBOLS F,OR THE DYNAMIC PARAMETERS6. SUBSCRIPT F (For Additional Information)If necessary, subscript F is used to represent any additionalqualification of the parameter such as mode ofoperation, test conditi9ns, etc. The letter symbols forsubscript F are given below.Subscript P sltould be in upper-case.Modes of operationPower-downPage-mode readPage-mode writeReadRefreshRead-modify-writeRead-writeWriteSubscriptPOPGRPGWRRFRMWRWW-1-12• MITSUBISHI.... ELECTRIC
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MELPS 8-41 SLAVE MICROCOMPUTERS
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MIC-ROCOMPUTER SUPPORT SYSTEMS
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APPENDICES
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CONTACT ADDRESSES FOR FURTHER INFOR
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MEMO
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