參數(shù)資料
型號(hào)： ICS1889
英文描述： 100Base-FX Integrated PHYceiverTM
中文描述： 100Base - FX光纖綜合PHYceiverTM
文件頁(yè)數(shù)： 5/35頁(yè)
文件大小： 1096K
代理商： ICS1889
5
ICS1889
4B/5B Encoder/Decoder
The
ICS1889
uses a 4B5B coding scheme. This maps a 4-bit
nibble to a 5-bit code group called a symbol. Five bits allow
32 possible symbols, 16 are used for data encoding, 6 are used
for control and 10 are not used and are invalid. The control
symbols used are JK as the SSD, TR as the ESD, I as
the IDLE symbol and H to signal an error. All other
symbols are invalid and, if detected, will set the receive error
bit in the status register, and cause the RXER signal to be
asserted (see
Table 1
below).
When transmitting, nibbles from the MII are converted to a 5-
bit code groups. During transmission, the first 16 nibbles
obtained from the MII are the MAC frame preamble.
The
ICS1889
replaces the first two nibbles with the start-of-
stream delimiter (the JK symbol pair). Following the last
nibble, the
ICS1889
adds the end-of-stream delimiter (the
TR symbol pair).
When receiving, 5-bit code groups are converted to nibbles
and presented to the MII. If the
ICS1889
detects one or more
invalid symbols, it sets the Invalid Symbol bit (17:7) in the
QuickPoll Status Register. When receiving a frame, the first
two 5-bit code groups received are the start-of-stream
delimiter (the JK symbol pair), the
ICS1889
strips them
and substitutes two nibbles of the normal preamble pattern.
The last two 5-bit code groups are the end-of-stream delimiter
(the TR symbol pair), these are stripped from the nibbles
presented to the MAC.
1. The IDLE symbol is sent continuously between frames.
2. J and K are the SSD and are always sent in pairs.
3. K always follows J.
4. T and R are the ESD and are always sent in pairs.
5. R always follows T.
6. A HALT symbol is used to signal an error condition.
Table 1: 4B5B Encoding
Symbol
Meaning
4B Code
3 2 1 0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
5B Code
4 3 2 1 0
1 1 1 1 0
0 1 0 0 1
1 0 1 0 0
1 0 1 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 1 0
0 1 1 1 1
Symbol
Meaning
4B Code
3 2 1 0
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
5B Code
4 3 2 1 0
1 0 0 1 0
1 0 0 1 1
1 0 1 1 0
1 0 1 1 1
1 1 0 1 0
1 1 0 1 1
1 1 1 0 0
1 1 1 0 1
0
1
2
3
4
5
6
7
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
8
9
A
B
C
D
E
F
Data 8
Data 9
Data A
Data B
Data C
Data D
Data E
Data F
I
J
K
T
R
H
V
V
Idle
SSD
SSD
ESD
ESD
Error
Invalid
Invalid
Undefined
0 1 0 1
0 1 0 1
Undefined
Undefined
Undefined
Undefined
Undefined
1 1 1 1 1
1 1 0 0 0
1 0 0 0 1
0 1 1 0 1
0 0 1 1 1
0 0 1 0 0
0 0 0 0 0
0 0 0 0 1
V
V
V
V
V
V
V
V
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
0 0 0 1 0
0 0 0 1 1
0 0 1 0 1
0 0 1 1 0
0 1 0 0 0
0 1 1 0 0
1 0 0 0 0
1 1 0 0 1
Invalid Error Code Test TXER asserted
1 1 1 1
1 1 1 1 1
1 1 1 0
1 1 0 0 0
1 0 1 1
1 0 0 0 1
1 0 0 1
0 1 1 0 1
0 1 1 1
0 0 1 1 1
0 1 0 0
0 0 1 0 0
0 0 0 0
0 0 0 0 0
0 0 0 1
0 0 0 0 1
I
J
K
T
R
H
V
V
Idle
SSD
SSD
ESD
ESD
Error
Invalid
Invalid
V
V
V
V
V
V
V
V
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
0 0 1 0
0 0 1 1
0 1 0 1
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 1
0 0 1 1 0
0 1 0 0 0
0 1 1 0 0
1 0 0 0 0
1 1 0 0 1
相關(guān)PDF資料
PDF描述
ICS1892 10Base-T/100Base-TX Integrated PHYceiver
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