M2V28S20TP View Datasheet(PDF) - Mitsumi

Part Name

Description

Manufacturer

M2V28S20TP

128M Synchronous DRAM

Mitsumi 

SDRAM (Rev. 1.0E)

Jun. '99

MITSUBISHI LSIs

M2V28S20TP-6,-7,-8

M2V28S30TP-6,-7,-7L,-8,-8L

M2V28S40TP-7,-7L,-8,-8L

128M Synchronous DRAM

(4-BANK x 8,388,608-WORD x 4-BIT)

(4-BANK x 4,194,304-WORD x 8-BIT)

(4-BANK x 2,097,152-WORD x 16-BIT)

BASIC FUNCTIONS

The M2V28S30TP 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

/RAS

/CAS

/WE

CKE

A10

Chip Select : L=select, H=deselect

Command

Command define basic commands

Command

Refresh Option @ refresh 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-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, all 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 internally. After this command, the banks are precharged automatically.

MITSUBISHI ELECTRIC

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