M66221FP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M66221FP

256 x 9-BIT MAIL-BOX

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66221SP/FP

256 × 9-BIT MAIL-BOX

BLOCK DIAGRAM

NOT READY

OUTPUT Not Ready A

WRITE ENABLE WEA

INPUT

CHIP SELECT CSA

INPUT

OUTPUT ENABLE

INPUT

OEA

 I/O0A

 I/O1A

A PORT

DATA I/O











I/O2A

I/O3A

I/O4A

I/O5A







I/O6A

I/O7A

 I/O8A

A0A

A PORT







A1A

A2A

A3A

ADDRESS

INPUT





A4A

A5A







A6A

A7A

VCC

CONTROL

CIRCUIT

ARBITRATION

CIRCUIT

CONTROL

CIRCUIT

OEA

A0A

WEA

A7A

9

I/O BUFFER

A0B

WEB

A7B

OEB

9

I/O BUFFER

8 ROW/COLUMN

DECODER

MEMORY ARRAY OF

256-WORD×9-BIT

CONFIGURATION

ROW/COLUMN 8

DECODER

GND

NOT READY

Not Ready B OUTPUT

WEB

WRITE ENABLE

INPUT

CSB

CHIP SELECT

INPUT

OEB

OUTPUT ENABLE

INPUT

I/O0B 

I/O1B 

I/O2B





I/O3B

I/O4B

I/O5B







B PORT

DATA I/O

I/O6B





I/O7B 

I/O8B 

A0B 

A1B

A2B

A3B

A4B













B PORT

ADDRESS

INPUT

A5B 

A6B





A7B 

Table 1 Mode Settings of Ports (A0A ~ A7A ≠ A0B ~ A7B)

A port input

B port input

Flag

CSA

WEA

OEA

CSB

WEB

OEB

Not

Not

Ready A Ready B

H

×

×

×

×

×

H

H

×

×

×

H

×

×

H

H

L

L

×

×

×

×

H

H

L

H

L

×

×

×

H

H

×

×

×

L

L

×

H

H

×

×

×

L

H

L

H

H

Operation

A port is set to the non-select mode.

B port is set to the non-select mode.

A port is set to the write mode for memory.

A port is set to the read mode for memory.

B port is set to the write mode for memory.

B port is set to the read mode for memory.

Table 2 Basic Functions of Ports

CS

WE

OE

Mode

H

×

×

Non-select

L

L

×

Write

L

H

L

Read

L

H

H

Note 1: × indicates “L” or “H”. (Irrelevant)

“H” = High level, “L” = Low level

I/O pin

High impedance

DIN

DOUT

High impedance

ICC

Stand-by

Operation

Operation

Operation

2

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