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V54C3256 Datasheet(PDF) 11 Page - Mosel Vitelic, Corp |
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V54C3256 Datasheet(HTML) 11 Page - Mosel Vitelic, Corp |
11 / 52 page 11 V54C3256(16/80/40)4V(T/S/B) Rev. 1.6 September 2002 MOSEL VITELIC V54C3256(16/80/40)4V(T/S/B) Signal Pin Description Pin Type Signal Polarity Function CLK Input Pulse Positive Edge The system clock input. All of the SDRAM inputs are sampled on the rising edge of the clock. CKE Input Level Active High Activates the CLK signal when high and deactivates the CLK signal when low, thereby initiates either the Power Down mode or the Self Refresh mode. CS Input Pulse Active Low CS enables the command decoder when low and disables the command decoder when high. When the command decoder is disabled, new commands are ignored but previous operations continue. RAS, CAS WE Input Pulse Active Low When sampled at the positive rising edge of the clock, CAS, RAS, and WE define the command to be executed by the SDRAM. A0 - A11 Input Level — During a Bank Activate command cycle, A0-A12 defines the row address (RA0-RA12) when sampled at the rising clock edge. During a Read or Write command cycle, A0-An defines the column address (CA0-CAn) when sampled at the rising clock edge.CAn depends from the SDRAM organization: • 64M x 4 SDRAM CA0–CA9, CA11. • 32M x 8 SDRAM CA0–CA9. • 16M x 16 SDRAM CA0–CA8. In addition to the column address, A10(=AP) is used to invoke autoprecharge operation at the end of the burst read or write cycle. If A10 is high, autoprecharge is selected and BA0, BA1 defines the bank to be precharged. If A10 is low, autoprecharge is disabled. During a Precharge command cycle, A10(=AP) is used in conjunction with BA0 and BA1 to control which bank(s) to precharge. If A10 is high, all four banks will BA0 and BA1 are used to define which bank to precharge. BA0, BA1 Input Level — Selects which bank is to be active. DQx Input Output Level — Data Input/Output pins operate in the same manner as on conventional DRAMs. LDQM UDQM Input Pulse Active High The Data Input/Output mask places the DQ buffers in a high impedance state when sam- pled high. In Read mode, DQM has a latency of two clock cycles and controls the output buffers like an output enable. In Write mode, DQM has a latency of zero and operates as a word mask by allowing input data to be written if it is low but blocks the write operation if DQM is high. VCC, VSS Supply Power and ground for the input buffers and the core logic. VCCQ VSSQ Supply — — Isolated power supply and ground for the output buffers to provide improved noise immunity. |
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