ASI4UC-G1-SR-7 ZMDI, ASI4UC-G1-SR-7 Datasheet - Page 54

• Manufacturer Part Number: ASI4UC-G1-SR-7
• Description: Interface - Specialized ASI
• Manufacturer: ZMDI

Specifications of ASI4UC-G1-SR-7

• Product Category: Interface - Specialized
• Rohs: yes
• Product Type: Actuator Sensor Interface IC
• Operating Supply Voltage: 16 V to 33.1 V
• Supply Current: 6 mA
• Maximum Power Dissipation: 850 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Minimum Operating Temperature: - 25 C

3.16. Write Protection of ID_Code_Extension_1
The ID_Code_Extension_1 register can either be manufacturer configurable or user configurable.
Data Sheet
January 30, 2012
ASI4U / ASI4U-E
Spec. 3.0 Com


If the flag ID_Code1_Protect is set (‘1’) in the firmware area of the E²PROM, ID_Code_Extension1 is
manufacturer configurable.
In this case the slave response to a Read_ID_Code_1 request is constructed out of the data stored in
the Protected_ID_Code_Extension1 register in Firmware Area of the E²PROM.
It doesn’t matter which data is stored in the ID_Code_Extension1 register in the User Area. The IC will
always respond with the protected manufacturer programmed value.
There is one exception to this principle. If the IC is operated in Extended Address Mode, Bit3 of the
returned slave response is taken from the ID_Code_Extension1 register in the User Area. This is
because Bit 3 functions as A/B Slave selector bit in this case and must remain user configurable.
To ensure consistency of ID_Code_Extension1 stored in the data image of Master as well as in the
E²PROM of the slave, the ASI4U will not process a Write_ID_Code1 request if the data sent does not
match the data that is stored in protected part of the ID_Code_Extension1 register. It will neither
access the E²PROM nor send a slave response in this case.
Note: As defined in the AS-i Complete Specification a modification of the A/B Slave selector bit must
be performed bit selective. That means the AS-i Master must read the ID_Code_Extension1 first,
modify Bit3 and send the new 4 bit word that consists of the modified Bit3 and the unmodified Bits 2
… 0 back to the slave.
If the ID_Code1_Protect flag is not set (‘0’), ID_Code_Extension1 is completely user configurable. The
data to construct the slave response to a Read_ID_Code_1 request is completely taken from the
ID_Code_Extension1 register in the user area.
In this configuration a Write_ID_Code1 request will always be answered and initiate an E²PROM write
access procedure.
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 2.1
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to
changes without notice.
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