UM0932 datasheet(28/43 Pages) STMICROELECTRONICS

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Host interface

UM0932

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3.3.14

PHY_DataIndication (26h)

This command is sent by the ST7580 device after a reception of a power line frame in

compliance with PHY frame specification (Figure 3) and it exports the PHY_Data indication

service (Section 2.4).

The command notification occurs if the modem is set at PHY layer only at MIB object

Modem Config 00h (Section 4.2.1), as in the diagram flow in Figure 5.

3.3.15

DL_DataRequest (50h)

This command is sent by the external host to request data transmission and it exports the

DL_Data transmission service (Section 2.3).



If accepted, the ST7580 constructs a DL frame (Figure 3) that is transmitted over the

power line according to the details expressed in RequestData field (same format as

PHY_DataRequest,Table 35) and with automatically appended CRC field with the

format selected in MIB object Modem Config (00h, Section 4.2.1). A positive

DL_DataConfirm (Section 3.3.16) is generated at the end of the transmission



If refused, the modem generates a DL_DataError (Table 12).

Table 38. PHY_DataIndication: Syntax

Source

Command(Args)

Possible response

ST7580

PHY_DataIndication (IndicationData)

None

Table 39. PHY_DataIndication: indicationData

Byte

Index

Bit

Index

Label

Description and available values

0 - 2

Frame modulation

Frame modulation on the last data indication received

0: B-PSK

1: Q-PSK

2: 8-PSK

3: B-FSK

4: B-PSK coded

5: Q-PSK coded

6: Reserved

7: B-PSK coded with Peak Noise Avoidance

RX channel

RX channel on the last data indication received

0: low channel

1: high channel

4 - 7

PGA value

PGA value on the last data indication received

1SNR

SNR estimated over the Unique Word reception (signed

value, valid for PSK received frames only, equal to 255 – no

meaning – for FSK received frames)

2 - 3

ZC delay

Delay between the received UW last bit and the mains zero-

crossing (signed value), expressed in 13 µs step

4 - 254

PHY payload

Received payload (up to 251 bytes)

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