UM0932 datasheet(11/43 Pages) STMICROELECTRONICS

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UM0932

Functional overview

2.3

Power line data transmission

In order to manage data transmission to the power line, three different dedicated services

are available to the external host.

PHY_Data transmission, with frames structured as in Figure 2, requiring the payload as

the only external parameter and building automatically the length field.

DL_Data transmission, with frames structured as in Figure 3, requiring the payload as

the only external parameter and building automatically the length and CRC fields.

SS_Data transmission, with frames structured as in Figure 4, requiring the payload and

header length (greater than 3) as external parameters, building automatically the

length, CRC and HL field, deciding an arbitrary initialization vector and encrypting the

payload.

The external host is allowed to access the ST7580 device and choose which among the

three frame structures are utilized for transmitting data over the power line by selecting the

corresponding available service.

2.4

Power line data reception

In order to manage data reception from the power line, the ST7580 can be configured to be

able to receive in accordance with only one frame structure.

The external host is allowed to set, through a dedicated MIB object (modem configuration,

00h Section 4.2.1), the only frame structure the ST7580 is able to receive.

The ST7580 embeds three corresponding available services:

PHY_Data indication: generated as soon as a frame in compliance with PHY frame

structure (Figure 2) has been received, it exports the PHY payload field

DL_Data indication: generated as soon as a frame in compliance with DL frame

structure (Figure 3) has been received, it exports the DL payload field

SS_Data indication: generated as soon as a frame in compliance with SS frame

structure (Figure 4) has been received, it exports the SS payload field.

A further feature of ST7580 configuration is the Sniffer flag. It can be activated by the

external host through a dedicated MIB object (modem configuration, 00h Section 4.2.1) and

it makes two further services available:

DL_Sniffer indication: generated as soon as a frame in compliance with DL frame

structure (Figure 3) with a wrong CRC has been received, it exports both DL payload

and wrong CRC fields.

SS_Sniffer indication: generated as soon as a frame in compliance with SS frame

structure (Figure 4) that couldn't be correctly decrypted or authenticated has been

received, it exports the whole SS_SDU field.

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