AM79C978AVCW datasheet(76/256 Pages) AMD

76 / 256 page

Am79C978A

Figure 39.

AID Symbol Transmit Timing

Figure 40.

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 described

in the Collisions section. Symbols 5 and 6 are used to

transmit remote control management commands across

the network. Coding and timing details are as follows.

The SYNC interval is followed by six AID symbols (sym-

bols 1 through 6). Transmit timing is shown in Figure 39;

receive timing in Figure 40. 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 individual

HomePNA stations and to detect collisions. The MSB is

encoded in AID Symbol 1 and is the leftmost bit in

Table 14.

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=128

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

22399A-42

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

Receiver

AID slice threshold

END_RCV_BLANK

AID_GUARD_INTERVAL

Detected envelope

22399A-43

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