ASI4U datasheet(33/71 Pages) RENESAS

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ASI4U / ASI4U-E / ASI4U-F Datasheet

January 26, 2016

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

of the Parameter Port signal P1. The following coding applies:

INPUT VALUE AT P1

DATA INPUT FILTER FUNCTION

LOW level (=0)

Activated

HIGH level (=1)

Deactivated

For further details, refer to section 4.7.

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

deactivates the Synchronous Data I/O Mode of the ASI4U/ASI4U-E/ASI4U-F. The 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 section 4.7.

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.

4.6.4.

Master, Repeater, and Monitor Modes

In the Master, Repeater, and Monitor Modes, the Parameter Port is configured differently than in Slave Mode. The

pins serve as output channels for additional support signals or become set to the high impedance state. There is

no input function associated with the Parameter Port pins.

The following support signals are provided at the Parameter Port in the Master, Repeater, and Monitor Modes.

Table 4.10 Parameter Port Output Signals in Master, Repeater, and Monitor Modes

MASTER MODE

REPEATER MODE

MONITOR MODE

Receive Clock

Hi-Z

Receive Clock

Power Fail

Hi-Z

Power Fail

Receive Strobe – Slave Telegram

Hi-Z

Receive Strobe – Slave Telegram

Hi-Z

Receive Strobe – Master Telegram

Receive Clock is provided to simplify external processing of Manchester-II-coded output data at the LED1 pin.

The availability of a new AS-i telegram bit at LED1 is signaled by a rising edge of the receive clock so that the

received data can simply be clocked into a shift register. The output signal is active HIGH.

Power Fail signals a breakdown of the AS-i supply voltage. The output signal is active HIGH. For further

information regarding the Power Fail function, refer to section 4.8.

Receive Strobe – Slave Telegram is generated after every correctly received AS-i slave telegram. The output

signal is active HIGH.

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