AM79C901AVIT datasheet(33/90 Pages) AMD

33 / 90 page

Am79C901A

PR ELI M IN AR Y

Figure 17.

AID Symbol Transmit Timing

Figure 18.

AID Symbol Receive Timing

The SYNC interval is followed by six AID symbols

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

ure 17; receive timing in Figure 18. 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 7.

Table 7.

Access ID Symbol Pulse Positions and

Encoding

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

22304B-19

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

D slice threshold

END_RCV_BLANK

AID_GUARD_INTERVAL

Detected envelope

22304B-20

Pulse

Position

TICs from Beginning of AID

Symbol

Bit Encoding

166

286

3106

4126

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