UM0934 datasheet(27/113 Pages) STMICROELECTRONICS

номер детали	UM0934

подробное описание детали	ST7570 S-FSK power line networking System-on-Chip

PDF	113 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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UM0934

MAC layer

Doc ID 17389 Rev 2

27/113

Figure 11.

MAC and PHY layer framing

4.5

Address management

Each long MAC frame contains two address fields:

●

source address (SA), identifying the station the frame has been transmitted from

●

destination address (DA), identifying the station the frame has been transmitted to.

Both SA and DA fields are 12 bits long.

There are three types of destination addresses:

●

individual address, used for point-to-point (unicast) communication

●

group addresses, used for multipoint (multicast)

●

broadcasting address.

M_sdu

Header

Zero

padding

FCS

Long MAC

Frame

7 bytes

1...242 bytes

variable 3 bytes

PHY

Layer

Power-line

medium

Sub-

frame 1

Sub-

frame 1

PRE +

SSD

4 bytes

38 bytes

PHY Frame

(P_pdu)

Pause

/Alarm

42 bytes

3 bytes

TIMESLOT (i+1)-th

Sub-

frame 2

Sub-

frame 2

PRE +

SSD

4 bytes

38 bytes

PHY Frame

(P_pdu)

Pause

/Alarm

42 bytes

3 bytes

Sub-

frame 7

Sub-

frame 7

PRE +

SSD

4 bytes

38 bytes

PHY Frame

(P_pdu)

Pause

/Alarm

42 bytes

3 bytes

TIMESLOT (i+2)-th

TIMESLOT (i+7)-th

from 1 up to 7 sub-frames according

to M_sdu length

MAC

Layer

Upper

Layers

M_Data.request

(M_sdu, DA, IC, CC, DC)

M_Data.indication

(M_sdu, SA, DA, IC, CC, DC)

M_pdu

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