M2V64S20BTP データシートの表示（PDF） - Mitsumi

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M2V64S20BTP

64M bit Synchronous DRAM

Mitsumi 

PC133 SDRAM (Rev.0.5)

Oct. '99

64M bit Synchronous DRAM

MITSUBISHI LSIs

M2V64S20BTP-6 (4-BANK x 4194304-WORD x 4-BIT)

M2V64S30BTP-6 (4-BANK x 2097152-WORD x 8-BIT)

M2V64S40BTP-6 (4-BANK x 1048576-WORD x 16-BIT)

BASIC FUNCTIONS

The M2V64S20(30,40)BTP 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. To know the detailed definition of commands, please see the

command truth table.

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 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-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 set by burst length. When A10 =H at 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 at this command, both banks are deactivated

(precharge all, PREA).

Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H]

REFA command starts auto-refresh cycle. Refresh address including bank address are

generated inter-nally. After this command, the banks are precharged automatically.

MITSUBISHI ELECTRIC

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