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UPD4564323G5-A10-9JH 数据表(PDF) 9 Page - NEC |
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UPD4564323G5-A10-9JH 数据表(HTML) 9 Page - NEC |
9 / 84 page Data Sheet M14376EJ2V0DS00 9 µµµµPD4564323 for Rev. E 2. Commands Mode register set command (/CS, /RAS, /CAS, /WE = Low) The µPD4564323 has a mode register that defines how the device operates. In this command, A0 through A10, BA0 and BA1 are the data input pins. After power on, the mode register set command must be executed to initialize the device. The mode register can be set only when all banks are in idle state. During 2 CLK (tRSC) following this command, the µPD4564323 cannot accept any other commands. Fig.1 Mode register set command /WE /CAS /RAS /CS CKE CLK H Add A10 BA0, BA1 (Bank select) Activate command (/CS, /RAS = Low, /CAS, /WE = High) The µPD4564323 has four banks, each with 4,096 rows. This command activates the bank selected by BA0 and BA1 and a row address selected by A0 through A10. This command corresponds to a conventional DRAM’s /RAS falling. Fig.2 Row address strobe and bank activate command /WE /CAS /RAS /CS CKE CLK H Add A10 BA0, BA1 Row Row (Bank select) Precharge command (/CS, /RAS, /WE = Low, /CAS = High) This command begins precharge operation of the bank selected by BA0 and BA1. When A10 is High, all banks are precharged, regardless of BA0 and BA1. When A10 is Low, only the bank selected by BA0 and BA1 is precharged. After this command, the µPD4564323 can’t accept the activate command to the precharging bank during tRP (precharge to activate command period). This command corresponds to a conventional DRAM’s /RAS rising. Fig.3 Precharge command /WE /CAS /RAS /CS CKE CLK H Add A10 BA0, BA1 (Bank select) (Precharge select) |
类似零件编号 - UPD4564323G5-A10-9JH |
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类似说明 - UPD4564323G5-A10-9JH |
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