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AS4C4M16S-7TCN Datasheet(PDF) 10 Page - Alliance Semiconductor Corporation |
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AS4C4M16S-7TCN Datasheet(HTML) 10 Page - Alliance Semiconductor Corporation |
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10 / 53 page  FEBRUARY 2011 AS4C4M16S CLK T0 T1 T2 T3 T4 T5 T6 T7 T8 ADDRESS COMMAND Bank, Col A READ A NOP NOP NOP Bank(s) Precharge tRP NOP NOP Bank Row Activate NOP CAS# latency=2 tCK2, DQ CAS# latency=3 tCK3, DQ DOUT A0 DOUT A1 DOUT A0 DOUT A2 DOUT A1 DOUT A3 DOUT A2 DOUT A3 Don’t Care Figure 9. Read to Precharge (CAS# Latency = 2, 3) 5 Read and AutoPrecharge command (RAS# = "H", CAS# = "L", WE# = "H", BAs = Bank, A10 = "H", A0-A7 = Column Address) The Read and AutoPrecharge command automatically performs the precharge operation after the read operation. Once this command is given, any subsequent command cannot occur within a time delay of {tRP(min.) + burst length}. At full-page burst, only the read operation is performed in this command and the auto precharge function is ignored. 6 Write command (RAS# = "H", CAS# = "L", WE# = "L", BAs = Bank, A10 = "L", A0-A7 = Column Address) The Write command is used to write a burst of data on consecutive clock cycles from an active row in an active bank. The bank must be active for at least t RCD(min.) before the Write command is issued. During write bursts, the first valid data-in element will be registered coincident with the Write command. Subsequent data elements will be registered on each successive positive clock edge (refer to the following figure). The DQs remain with high-impedance at the end of the burst unless another command is initiated. The burst length and burst sequence are determined by the mode register, which is already programmed. A full-page burst will continue until terminated (at the end of the page it will wrap to column 0 and continue). CLK T0 T1 T2 T3 T4 T5 T6 T7 T8 COMMAND NOP WRITE A NOP NOP NOP NOP NOP NOP NOP DQ DIN A0 DIN A1 DIN A2 DIN A3 don’t care The first data element and the write are registered on the same clock edge Figure 10. Burst Write Operation (Burst Length = 4) 9 Rev2.0 May 2014 |
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