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Preliminary Spec. ver
1.4
KS8910 100/10 Mbps ETHERNET TRANSCEIVER
NRZ TO NRZI AND NRZI TO NRZ CONVERSION
An NRZ to NRZI and NRZI to NRZ conversion module is designed into the KS8910 chip.This conversion can be
bypassed, and is controllable through a register bit.
The NRZ to NRZI module converts the signal from NRZ to NRZI as follows: The converter module samples the
input at the center of each bit period. If it sees a ONE, the output will shift at the beginning of the next bit period.
This transition can be high to low or low to high. If the converter module sees a ZERO, the output will remain
unchanged for another bit period.
The NRZI to NRZ module converts the signal from NRZI to NRZ as follows: If the input remains unchanged from 1-
bit period, then the converter module will output a ZERO. If there is a change, then a ONE will be output.
Data Bit
1
1
Bit Clock
1
2
NRZ Data
1
NRZI Data
1
1
0
1
0
3
4
5
6
7
1
1
1
0
1
Figure 4-9. NRZ to NRZI Conversion of KS8910
1
0
0
1
0
8
9
13
10
11
12
0
1
0
0
1
100BASE-TX DIGITAL BLOCKS
0
1
1
1
0
17
14
15
16
18
0
0
1
1
0
1
1
1
19
20
1
1
1
4-13
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