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HYB39S16800CT-8 Datasheet(PDF) 4 Page - Siemens Semiconductor Group |
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HYB39S16800CT-8 Datasheet(HTML) 4 Page - Siemens Semiconductor Group |
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4 / 19 page  HYB 39S16400/800/160CT-8/-10 16 MBit Synchronous DRAM Semiconductor Group 4 1998-10-01 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 inititiates either the Power Down mode, Suspend 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 - A10 Input Level – During a Bank Activate command cycle, A0 - A10 defines the row address (RA0 - RA10) when sampled at the rising clock edge. During a Read or Write command cycle, A0 - A9 defines the column address (CA0 - CAn) when sampled at the rising clock edge. CAn depends from the SDRAM organisation. 4M × 4 SDRAM CAn = CA9 2M × 8 SDRAM CAn = CA8 1M × 16 SDRAM CAn = CA7 In addition to the column address, A10 is used to invoke auto- precharge operation at the end of the burst read or write cycle. If A10 is high, autoprecharge is selected and A11 defines the bank to be precharged (low = bank A, high = bank B). If A10 is low, autoprecharge is disabled. During a Precharge command cycle, A10 is used in conjunction with A11 to control which bank(s) to precharge. If A10 is high, both bank A and bank B will be precharged regardless of the state of A11. If A10 is low, then A11 is used to define which bank to precharge. A11 (BS) Input Level – Selects which bank is to be active. A11 low selects bank A and A11 high selects bank B. DQx Input Output Level – Data Input/Output pins operate in the same manner as on conventional DRAMs. DQM, LDQM, UDQM Input Pulse Active High The Data Input/Output mask places the DQ buffers in a high impedance state when sampled 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. |
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