BU9883FV-W_1 Datasheet, PDF (8/19 Pages) Rohm – I2C BUS3Ports for HDMI Port Serial EEPROM

BU9883FV-W
●WRITE CYCLE TIMING
Technical Note
SCL0
SDA0
D0
WRITE DATA(n)
ACK
tWR
STOP CONDITION
START CONDITION
Fig.40 WRITE CYCLE TIMING
●WRITE OPERATION
BU9883FV-W has 2K bit EEPROM in each port, there are three BANKs, 6K bit EEPROM in this device.
Each BANK EEPROM can be written through PORT0.
There is no write operation through PORT1,2,3.
When this device is accessed throgh PORT0, WPB terminal must be set to “HIGH”.
Table1 Access port and write enable BANK
Port0
BANK1～3
Port1
No write operation
Port2
No write operation
Port3
No write operation
●READ OPERATION
Each BANK EEPROM can be read through each port.
The relation ship of access port and access BANK is describe Table2.
Table 2
Table 3
Port0
BANK1～3
Port0
Port1
No write operation
Port1
Port2
No write operation
Port2
Port3
No write operation
Port3
BANK1～3
BANK1
BANK2
BANK3
○When EEPROM access through PORT0, P1, P0 bits in slave address appoint access BANK.
Table 4
P1
P0
P1,P0 bit and access BANK
0
0
No bank selected
0
1
BANK1
1
0
BANK2
1
1
BANK3
Note) When P1=0, P0=0 : this device doesn’t return Acknowlege.
○During PORT0 access, WPB terminal must be set to “HIGH”, then PORT1～3 accesses will be cancelled.
○In accessing from PORT1～3, set WPB termianl to “LOW”
●DEVICE OPERATION
○START CONDITION
・All commands are proceeded by the start condition, which is a HIGH to LOW transition of SDA0～3 when SCL0～3 is
HIGH.
・This device continuously monitors the SDA0～3 and SCL0～3 lines for the start condition and will not respond to any
command until this condition has been met.
○STOP CONDITION
・All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA0～3when SCL0
～3 is HIGH.
・The stop condition initiates internal write cycle to write the data into memory array after write sequence.
・The stop condition is also used to place the device into the standby power mode after read sequence.
・A stop condition can only be issued after the transmitting device has released the bus.
○NOTICE ON WRITE COMMAND
・In Write command, after transmit write data, if there are no stop condition, EEPROM data don’t change.
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2009.04 - Rev.B