X9119 Datasheet, PDF (6/22 Pages) Xilinx, Inc – Single Digitally-Controlled (XDCP ™ ) Potentiometer

X9119 – Preliminary Information
Figure 2. Acknowledge Response from Receiver
SCL from
Master
1
Data Output
from Transmitter
8
9
Data Output
from Receiver
START
ACKNOWLEDGE
ACKNOWLEDGE POLLING
The disabling of the inputs, during the internal
nonvolatile write operation, can be used to take
advantage of the typical 5ms EEPROM write cycle
time. Once the stop condition is issued to indicate the
end of the nonvolatile write command the X9119
initiates the internal write cycle. ACK polling, Flow 1,
can be initiated immediately. This involves issuing the
start condition followed by the device slave address. If
the X9119 is still busy with the write operation no ACK
will be returned. If the X9119 has completed the write
operation an ACK will be returned and the master can
then proceed with the next operation.
FLOW 1. ACK Polling Sequence
Nonvolatile Write
Command Completed
EnterACK Polling
Issue
START
Issue Slave
Address
Issue STOP
ACK
No
Returned?
Yes
Further
No
Operation?
Yes
Issue
Instruction
Issue STOP
Proceed
Proceed
REV 1.1.11 3/12/02
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