M2V64S20DTP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M2V64S20DTP

64M Synchronous DRAM

MITSUBISHI ELECTRIC  

MITSUBISHI LSIs

SDRAM (Rev.3.2)

Feb.'00

M2V64S20DTP-6,-6L,-7,-7L,-8,-8L (4-BANK x 4,194,304-WORD x 4-BIT)

M2V64S30DTP-6,-6L,-7,-7L,-8,-8L (4-BANK x 2,097,152-WORD x 8-BIT)

M2V64S40DTP-6,-6L,-7,-7L,-8,-8L (4-BANK x 1,048,576-WORD x 16-BIT)

64M Synchronous DRAM

BASIC FUNCTIONS

The M 2V64S20, 30 and 40DTP provides basic functions, bank (row) activate, burst read and write, bank

(row) precharge, and auto and 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. To know the detailed definition of commands, please see the command

truth table.

CLK

/CS

/RAS

/CAS

/WE

CKE

A10

Chip Select : L=select, H=deselect

Command

Command def ine basic commands

Command

Ref resh Option @ref resh command

Precharge Option @precharge or read/write command

Activate (ACT) [/RAS =L, /CAS =/WE =H]

ACT command activates a 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 at this command, the bank is deactivated after the burst read (auto-

p recharge,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 set by burst length. When A10 =H at this command, the bank is deactivated after the burst write

(auto-p recharge, 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 at 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 address are generated internally. After this

command, the banks are precharged automatically.

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