24VL024SLASHMS datasheet(10/30 Pages) MICROCHIP

10 / 30 page

24VL024/24VL025

DS22130A-page 10

7.0

ACKNOWLEDGE POLLING

Since the device will not acknowledge during a write

cycle, this can be used to determine when the cycle is

complete (this feature can be used to maximize bus

throughput). Once the Stop condition for a write

command has been issued from the master, the device

initiates the internally-timed write cycle and ACK polling

can be initiated immediately. This involves the master

sending a Start condition followed by the control byte

for a Write command (R/W = 0). If the device is still

busy with the write cycle, no ACK will be returned. If no

ACK is returned, the Start bit and control byte must be

re-sent. If the cycle is complete, the device will return

the ACK and the master can then proceed with the next

Read or Write command. See Figure 7-1 for a flow

diagram of this operation.

FIGURE 7-1:

ACKNOWLEDGE POLLING

FLOW

Send

Write Command

Send Stop

Condition to

Initiate Write Cycle

Send Start

Send Control Byte

with R/W = 0

Did Device

Acknowledge

(ACK = 0)?

Operation

Yes

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