UM0932 datasheet(16/43 Pages) STMICROELECTRONICS

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Host interface

UM0932

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DocID17385 Rev 3

Table 7 lists their fixed codes.

3.2.4

Status message

The status message is a frame sent by the ST7580 to the host controller when the T_REQ

signal is pulled down.

It is composed of 2 bytes filled in accordance with ST7580 status and configuration. The first

byte (byte index 0) is always the character “?” (ASCII code 3Fh). Other bytes are set as in

Table 8:

Table 7. ACK and NAK messages codes

Symbol

Definition

Code

ACK

Acknowledgement

06h

NAK

Not acknowledgement

15h

Table 8. Status message composition

Byte

index

Bit

index

Description

Available values

Status message first byte 3Fh

Configuration status

0: autoreconfiguration correctly occurred

1: autoreconfiguration occurred with errors or at least one

among MIB objects 00h (Modem Config), 01h (PHY

Config), 02h (SS Key) hasn’t changed its default value

after boot

Transmission status

0: the ST7580 is not transmitting a power line frame

1: the ST7580 is transmitting a power line frame

Reception status

0: the ST7580 is not receiving a power line frame

1: the ST7580 is receiving a power line frame

3-4

Active layer

0: PHY layer

1: DL layer

2: SS layer

3: ST7580 not configured

Overcurrent flag

0: no overcurrent event on last transmission

1: last transmission generated at least one overcurrent

event

6-7

Estimated ST7580

temperature

0: T < 70 °C (typical)

1: 70 °C < T <100 °C (typical)

2: 100 °C < T < 125 °C (typical)

3: T > 125 °C (typical)

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