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M5M4V4S40CTP-15 Datasheet(PDF) 4 Page - Mitsubishi Electric Semiconductor |
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M5M4V4S40CTP-15 Datasheet(HTML) 4 Page - Mitsubishi Electric Semiconductor |
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4 / 45 page  4 M5M4V4S40CTP-12, -15 Feb ‘97 Preliminary MITSUBISHI LSIs 4M (2-BANK x 131072-WORD x 16-BIT) Synchronous DRAM MITSUBISHI ELECTRIC SDRAM (Rev. 0.3) BASIC FUNCTIONS The M5M4V4S40CTP has the following basic functions, bank (row) activate, burst read/write, bank (row) precharge, and auto/self refresh. Each command is defined by the control signals (/RAS, /CAS and /WE) at the rising edge of CLK. The inputs /CS ,CKE and A8 are used for chip select, refresh options, and precharge options, respectively. Please see the command truth table for detailed definitions. Activate (ACT) [/RAS =L, /CAS =/WE =H] The ACT command activates a row in an idle bank. The bank address, BA, is used to select which of the two banks will be activated. Read (READ) [/RAS =H, /CAS =L, /WE =H] The READ command starts burst read from the active bank indicated by BA. The first output data appears after /CAS latency. If A8 =H when READ is issued the bank is automatically precharged after the last burst read (READA). Note: READA is not valid for FP burst operations. Write (WRITE) [/RAS =H, /CAS =/WE =L] The WRITE command starts burst write to the active bank indicated by BA. Total data length to be written is set by burst length. If A8 =H when WRITE is issued the bank is automatically precharged after the last burst write (WRITEA). Note: WRITEA is not valid for FP burst operations. Precharge (PRE) [/RAS =L, /CAS =H, /WE =L] The PRE command deactivates the active bank indicated by BA. This command also terminates burst read and write operations. If A8 =H when PRE is issued both banks are automatically precharged (PREA). Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H] The REFA command starts an auto-refresh cycle. The refresh address, including the bank address, is generated internally. After this command, the banks are precharged automatically. /CS Chip Select : L=select, H=deselect /RAS Command /CAS Command /WE Command CKE Refresh Option @refresh command A8 Precharge Option @precharge or read/write command CLK define basic commands |
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