EMC2302 datasheet(15/44 Pages) SMSC

15 / 44 page

Dual RPM-Based PWM Fan Controller

Datasheet

SMSC EMC2302

Revision 1.1 (10-12-09)

DATASHEET

3.2.6

Block Read Protocol

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in

Table 3.7. It is an extension of the Read Byte Protocol.

3.2.7

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 Table 3.8.

The EMC2302 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

from the device was not prematurely stopped due to a bus contention event).

2. Set the MASK bit to clear the ALERT# pin.

Table 3.7 Block Read Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

START

SLAVE

ADDRESS

ACK

DATA

1->0

YYYY_YYYb

XXh

1 ->0

YYYY_YYYb

XXh

ACK

DATA

ACK

DATA

ACK

DATA

ACK

. . .

DATA

NACK

STOP

XXh

. . .

XXh

0 -> 1

Table 3.8 Alert Response Address Protocol

START

ALERT

RESPONSE

ADDRESS

ACK

DEVICE

ADDRESS

NACK

STOP

1 -> 0

0001_100b

YYYY_YYYb

0 -> 1

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