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DDR signal classification [Copy link]


1. DDR types: According to data bits: 4-bit, 8-bit, 16-bit, 32-bit, 64-bit. Currently, 8-bit, 16-bit, and 32-bit are the most commonly used. 2. DDR signal types: According to data bits: 4-bit, 8-bit, 16-bit, 32-bit, and 64-bit. Currently, 8-bit, 16-bit, and 32-bit are the most commonly used. Data signal: D0-D8, D0-D15, D0-D31 Address signal: A0-A15 Differential clock: CKN/CKP Clock enable signal: CKE Chip enable signal: CS Chip write signal: WE Chip read address signal: RAS Chip command address signal: CAS Chip reset signal: RESET Data bit enable signal: DQSN/DQSP Each pair of signals controls 8 bits of data Data mask signal: DM Each maskable8 bits of data Block address selection signal: BA0, BA1, BA2 Chip data enable signal: ODT Reference level signal: REFECA/REFDQ External voltage calibration signal: ZQ




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