AM79C978VCSLASHW datasheet(77/261 Pages) AMD

77 / 261 page

Am79C978

Figure 38.

AID Symbol Transmit Timing

Figure 39.

AID Symbol Receive Timing

AID Symbols 1 through 6

AID symbols 1 through 4 are used to identify individual

stations to enable reliable collision detection as de-

scribed in the Collisions section. Symbols 5 and 6 are

used to transmit remote control management com-

mands across the network. Coding and timing details

are as follows.

The SYNC interval is followed by six AID symbols

(symbols 1 through 6). Transmit timing is shown in Fig-

ure 38; receive timing in Figure 39. Data is encoded in

the relative position of each pulse with respect to the

previous one. A pulse may occur at one, and only one,

of the four possible positions within an AID symbol

yielding two bits of data coded per AID symbol.

The decoded bits from the AID symbols 1 to 4 produce

eight bits of Access ID which is used to identify individ-

ual HomePNA stations and to detect collisions. The

MSB is encoded in AID Symbol 1 and is the leftmost bit

in Table 12.

AID Symbol 0

AID Symbol 1

AID Symbol 2

pulse 2

shown in position 1

pulse 0

pulse 1

TIC=129

and

TIC=0

TIC=129

and

TIC=0

SYNC_START

TIC=0

SYNC_END

TIC=126

AID_Position_0

TIC=66

AID_Position_1

TIC=86

AID_Position_2

TIC=106

AID_Position_3

TIC=126

Transmitter

22206B-42

AID Symbol 0

AID Symbol 1

AID Symbol 2

pulse 2

shown in position 1

pulse 0

pulse 1

TIC=128

and

TIC=0

TIC=12

8 and

TIC=0

SYNC_START

TIC=0

SYNC_END

TIC=126

AID_Position_0

TIC=66

AID_Position_1

TIC=86

AID_Position_2

TIC=106

AID_Position_3

TIC=126

Receiver

AID slice threshold

END_RCV_BLANK

AID_GUARD_INTERVAL

Detected envelope

22206B-43

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