MH1S64CWXTJ-12 Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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MH1S64CWXTJ-12

67108864-BIT (1048576-WORD BY 64-BIT)SynchronousDRAM

MITSUBISHI ELECTRIC  

Preliminary Spec.

MITSUBISHI LSIs

Some contents are subject to change without notice.

MH1S64CWXTJ-12,-15,-1539

67108864-BIT (1048576-WORD BY 64-BIT)SynchronousDRAM

BASIC FUNCTIONS

The MH1S64CWXTJ 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

Chip Select : L=select, H=deselect

/RAS

Command

/CAS

Command define basic commands

/WE

Command

CKE

A10

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-0064-0.2

MITSUBISHI

ELECTRIC

( 5 / 45 )

Oct.28.1996

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