NV34C04

www.onsemi.com

9

Table 11a. SWP SET COMMAND DETAIL (following Slave Address)

Command

Block(x)

Protection

Slave

Response

Address

Byte

Slave

Response

Data Byte

Slave

Response

Write

Cycle

SWPx(Note 13)

Not Set

ACK

(Dummy)

ACK

(Dummy)

ACK

Yes

Set

NoACK

(Dummy)

NoACK

(Dummy)

NoACK

No

CWP

X

ACK

(Dummy)

ACK

(Dummy)

ACK

Yes

Table 11b. SWP QUERRY COMMAND DETAIL (following Slave Address)

Command

Block(x)

Protection

Slave

Response

Data Byte

Master

(Response)

Data Byte

Master

(Response)

RPSx (Nots 13, 14)

Not Set

ACK

Dummy

(NoACK)

Dummy

(NoACK)

Set

NoACK

Dummy

(NoACK)

Dummy

(NoACK)

Table 11c. SPD PAGE SELECT COMMAND DETAIL (following Slave Address)

Command

SPD Active

Page

Slave

Response

Address

Byte

Slave

Response

Data Byte

Slave

Response

Write

Cycle

SPAx (Notes 15, 16)

X

ACK

(Dummy)

ACK

(Dummy)

ACK/NoACK*

No

Table 11d. SPD ACTIVE PAGE QUERRY COMMAND DETAIL (following Slave Address)

Command

SPD Active

Page

Slave

Response

Data Byte

Master

(Response)

Data Byte

Master

(Response)

RPA

(Notes 13, 14, 17)

0

ACK

Dummy

(NoACK)

Dummy

(NoACK)

1

NoACK

Dummy

(NoACK)

Dummy

(NoACK)

13. The Master can terminate the sequence by issuing a STOP once the NV34C04 responds with NoACK

14. The Master can terminate the sequence by responding with (NoACK) followed by STOP after any dummy data byte.

15. Setting the SPD Page Address to ‘0’ selects the lower 2−Kb EEPROM bank, setting it to ‘1’ selects the upper 2−Kb EEPROM bank.

16. The lower 2−Kb EEPROM bank (corresponding to SPD page address ‘0’) is active (visible) immediately following power−up.

17. The device will respond with ACK when the lower 2−Kb EEPROM bank is active and with NoACK when the upper 2−Kb EEPROM bank is

active.

*The NV34C04MU3VTG will respond with NoACK following the dummy Data Byte, while the NV34C04MUW3VTG will respond with ACK

Figure 12. SWP & SPA Timing

Figure 13. RPS & RPA Timing

Dummy

DATA

SLAVE

ADDRESS

BUS ACTIVITY:

MASTER

SDA LINE

SLAVE

X = Don’t Care

S

T

A

R

T

S

T

O

P

N

O

A

C

K

or

A

C

K

N

O

A

C

K

or

A

C

K

N

O

A

C

K

or

A

C

K

Dummy

ADDRESS

SLAVE

ADDRESS

BUS ACTIVITY:

MASTER

SDA LINE

SLAVE

X = Don’t Care

Dummy

DATA

S

T

A

R

T

S

T

O

P

N

O

A

C

K

N

O

A

C

K

N

O

A

C

K

or

A

C

K

Dummy

DATA