ASI4U datasheet(33/64 Pages) ETC2

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ASI4U / ASI4U-E / ASI4U-F

Spec. 3.0 Compliant Universal AS-I IC

Data Sheet

April 2, 2012

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

33 of 63

3.6.2.

Parameter Multiplex Mode

AS-i Complete Specification v3.0 defines a so called Parameter Multiplex Mode. This new feature allows bi-

directional data transfer through the parameter port. The bi-directionality is achieved by turning the Parameter

Output Drivers off after the Parameter Strobe period and before the input sampling event. By turning off its

output drivers during the Parameter Strobe pulse, an external microcontroller can read the data from the

Parameter Port of the ASI4U, prepare new return data and place it to the port right after the Parameter Strobe

signal.

The Parameter Multiplex Mode becomes activated by setting the corresponding Multiplex_Parameter flag

(=’1’) in the E²PROM.

To keep full compatibility to A²SI based applications this flag should be kept zero (=’0’). The A²SI did not allow

real bi-directional parameter data transfer since it was not able to turn the output drivers off. The return value

to a Write_Parameter call was always a wired AND combination of the output signal of the IC and the signal

driven to the port by the external logic.

3.6.3.

Special function of P0, P1 and P2

In case the Watchdog_Active flag is not set (=’0’) but the P0_Watchdog_Activation flag is set (= ‘1’, Firmware

Area of the E²PROM) the value of the Parameter Port signal P0 determines whether the communication

watchdog is enabled or disabled. In compliance to Slave Profile 7D-5 the behavior is defined as follows:

Input Value at P0 State of Communication Watchdog

Low level (=’0’)

Disabled

High level (=’1’)

Enabled

If the P1_Filter_Activation flag is set in the E²PROM, the activation of the data input filters depends on the

value of the Parameter Port signal P1. Following coding applies:

Input Value at P1 Data input filter function

Low level (=’0’)

Activated

High level (=’1’)

Deactivated

For further details refer to chapter 3.7 Data Port and DSR – Input Data Pre-Processing.

If the Synchronous_Data_I/O_Mode flag is set in the E²PROM, the value of the parameter port P2 activates or

deactivates the Synchronous Data I/O Mode of the ASI4U. Following coding applies:

Input Value at P2 Synchronous Data I/O Mode

Low level (=’0’)

Activated

High level (=’1’)

Deactivated

For further details refer to chapter 3.7 Data Port and DSR – Synchronous Data I/O Mode.

The processed values of P0, P1 and P2 result from a wired-AND combination between the corresponding

output value and the input value driven by an external signal source.

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