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MH8S64BBKD-10

536870912-BIT (8388608 - WORD BY 64-BIT)SynchronousDRAM

MITSUBISHI ELECTRIC  

Preliminary Spec.

Some contents are subject to change without notice.

MITSUBISHI LSIs

MH8S64BBKD-10,-10L

536870912-BIT (8388608 - WORD BY 64-BIT)SynchronousDRAM

BASIC FUNCTIONS

The MH8S64BBKD 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]

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

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

MIT-DS-0244-0.4

MITSUBISHI

ELECTRIC

( 7 / 55 )

15/Jan./1999

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