EMC2301 Standard Microsystems Corp., EMC2301 Datasheet - Page 15

• Manufacturer Part Number: EMC2301
• Description: Rpm-based Pwm Fan Controller
• Manufacturer: Standard Microsystems Corp.

START
1->0
ACK
0
YYYY_YYYb
REGISTER
ADDRESS
SLAVE
RPM-Based PWM Fan Controller
Datasheet
SMSC EMC2301
DATA
3.2.6
3.2.7
XXh
START
1 -> 0
Block Read Protocol
The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in
Table
Alert Response Address
The ALERT# output can be used as a processor interrupt or as an SMBus Alert when configured to
operate as an interrupt.
When it detects that the ALERT# pin is asserted, the host will send the Alert Response Address (ARA)
to the general address of 0001_100xb. All devices with active interrupts will respond with their client
address as shown in
The EMC2301 will respond to the ARA in the following way if the ALERT# pin is asserted.
1. Send Slave Address and verify that full slave address was sent (i.e. the SMBus communication
2. Set the MASK bit to clear the ALERT# pin.
ACK
WR
0
0
from the device was not prematurely stopped due to a bus contention event).
3.7. It is an extension of the Read Byte Protocol.
RESPONSE
ADDRESS
0001_100b
ALERT
REGISTER
DATA
XXh
ACK
0
Table 3.8 Alert Response Address Protocol
Table
REGISTER
ADDRESS
Table 3.7 Block Read Protocol
3.8.
XXh
ACK
RD
0
1
DATASHEET
REGISTER
ACK
DATA
15
XXh
ACK
0
0
START
1 ->0
ACK
YYYY_YYYb
0
ADDRESS
DEVICE
YYYY_YYYb
ADDRESS
SLAVE
. . .
. . .
NACK
1
Revision 1.2 (03-22-10)
REGISTER
DATA
XXh
RD
1
STOP
0 -> 1
NACK
ACK
0
1
REGISTER
0 -> 1
DATA
STOP
XXh