M2S12D20TP データシートの表示（PDF） - MITSUBISHI ELECTRIC
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M2S12D20TP Datasheet PDF : 38 Pages
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DDR SDRAM (Rev.1.1)
Feb.ME'0LITE2SCUTBRIISCHI
MITSUBISHI LSIs
M2S12D20/ 30TP -75, -75L, -10, -10L
512M Double Data Rate Synchronous DRAM
BASIC FUNCTIONS
The M2S12D20/30TP provides basic functions, bank (row) activate, burst read / write, bank (row)
precharge, and auto / self refresh. Each command is defined by control signals of /RAS, /CAS and
/WE at CLK rising edge. In addition to 3 signals, /CS ,CKE and A10 are used as chip select,
refresh option, and precharge option, respectively. Refer to the command truth table for the
detailed definition of commands.
/CLK
CLK
/CS
Chip Select : L=select, H=deselect
/RAS
Command
/CAS
Command
define basic commands
/WE
Command
CKE
Refresh Option @refresh command
A10
Precharge Option @precharge or read/write command
Activate (ACT) [/RAS =L, /CAS =/WE =H]
ACT command activates one row in an idle bank indicated by BA.
Read (READ) [/RAS =H, /CAS =L, /WE =H]
READ command starts burst read from the active bank indicated by BA. First output data appears after
/CAS latency. When A10 =H in this command, the bank is deactivated after the burst read (auto-
precharge, READA)
Write (WRITE) [/RAS =H, /CAS =/WE =L]
WRITE command starts burst write to the active bank indicated by BA. Total data length to be written
is defined by burst length. When A10 =H in this command, the bank is deactivated after the burst write
(auto-precharge, WRITEA)
Precharge (PRE) [/RAS =L, /CAS =H, /WE =L]
PRE command deactivates the active bank indicated by BA. This command also terminates burst read
/write operation. When A10 =H in this command, all banks are deactivated (precharge all, PREA ).
Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H]
REFA command starts auto-refresh cycle. Refresh addresses including bank address are generated
internally. After this command, the banks are precharged automatically.
MITSUBISHI ELECTRIC
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