8101 datasheet(45/172 Pages) LSI

45 / 172 page

8B10B PCS

2-27

The encoder also converts the start of packet delimiter, end of packet

delimiter, idle code streams, and AutoNegotiation code streams into

unique 10B code words. These unique 10B code words are referred to

as ordered sets. Table 2.8 describes the ordered sets deﬁned and used

by IEEE 802.3z.

The 8B10B encoder also keeps the running disparity of the outgoing 10B

word as close as possible to zero. Running disparity is the difference

between the number of ones and zeros transmitted on the outgoing bit

stream. The algorithm for calculating running disparity is deﬁned in

802.3z. After each 10B word is transmitted, the running disparity is

recalculated. If the current running disparity is negative, the next 10B

word is chosen from the "Current RD

−" column in Table 2.7 (in

abbreviated form). If the current running disparity is positive, the next 10B

word is chosen from the "Current RD+" column in Table 2.7.

Table 2.7

8B10B Coding Table

8B Bytes

10B Codes

Data Byte

Name

Bits

HGFEDCBA

CurrentRD

−

abcdei fghj

CurrentRD+

abcdei fghj

D0.0

000 00000

100111 0100

011000 1011

D1.0

000 00001

011101 0100

100010 1011

D2.0

000 00010

101101 0100

010010 1011

D3.0

000 00011

110001 1011

110001 0100

D28.7

111 11100

001110 1110

001110 0001

D29.7

111 11101

101110 0001

010001 1110

D30.7

111 11110

011110 0001

100001 1110

D31.7

111 11111

101011 0001

010100 1110

8101 Datasheet(PDF) 45 Page - LSI Computer Systems

8101 Datasheet(HTML) 45 Page - LSI Computer Systems

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL