MB85RC256V datasheet(9/39 Pages) RAMXEED

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MB85RC256V

DS501-00017-11v2-E

• Sequential Read

Data can be received continuously following the Device address word (R/W “1” input) after specifying the

address in the same way as for Random Read. If the read reaches the end of address, the internal read

address automatically rolls over to first memory address 0000H and keeps reading.

• Device ID

The Device ID command reads fixed Device ID. The size of Device ID is 3 bytes and consists of manufacturer

ID and product ID. The Device ID is read-only and can be read out by following sequences.

a) The master sends the Reserved Slave ID F8H after the START condition.

b) The master sends the device address word after the ACK response from the slave.

In this device address word, R/W code are “Don't care” value.

c) The master re-sends the START condition followed by the Reserved Slave ID F9H after the ACK response

from the slave.

d) The master read out the Device ID succeedingly in order of Data Byte 1st / 2nd / 3rd after the ACK

response from the slave.

e) The master responds the NACK (SDA is the “H” level) after reading 3 bytes of the Device ID.

In case the master respond the ACK after reading 3 bytes of the Device ID, the master re-reading the

Device ID from the 1st byte.

Stop Condition

ACK (SDA is the "L" level)

NACK (SDA is the "H" level)

N P

Read

Data 8bits

Read

Data 8bits

Read

Data

...

Access from master

Access from slave

9876543210

000000001010010100010000

Density = 5H

Proprietary use

Manufacture ID = 00AH

Product ID = 510H

Data Byte 1st

Data Byte 2nd

Data Byte 3rd

Reserved

Slave ID

(F8H)

Reserved

Slave ID

(F9H)

A 1010 A2 A1 A0

A Data Byte

1st

Data Byte

2nd

Data Byte

3rd

N P

Access from master

Access from slave

Stop Condition

ACK (SDA is the "L" level)

NACK (SDA is the "H" level)

Start Condition

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