MH8S72BAFD-7 查看數據表（PDF） - MITSUBISHI ELECTRIC

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MH8S72BAFD-7

603,979,776-BIT ( 8,388,608-WORD BY 72-BIT ) Synchronous DYNAMIC RAM

MITSUBISHI ELECTRIC  

MH8S72BAFD -7, -8 MITSUBISHI LSIs

P rSepl iemci.n a r y 603,979,776-BIT ( 8,388,608-WORD BY 72-BIT ) Synchronous DYNAMIC RAM

BASIC FUNCTIONS

The MH8S72BAFD 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 CK rising edge. In

addition to 3 signals,/S,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.

CK

/S

/RAS

/CAS

/WE

CKE

A10

Chip Select : L=select, H=deselect

Command

Command

Command

define basic commands

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, both banks are

deactivated(precharge all, PREA).

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

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

generated internally. After this command, the banks are precharged automatically.

MIT-DS-0273-0.2

MITSUBISHI

ELECTRIC

1/ Dec./1998 7

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