dp83222 National Semiconductor Corporation, dp83222 Datasheet - Page 9

• Manufacturer Part Number: dp83222
• Description: Cyclone Twisted Pair Fddi Stream Cipher Device
• Manufacturer: National Semiconductor Corporation

FIGURE 10 Descramble Change Time
FIGURE 9 RX Set and Hold Times
FIGURE 8 TX Set and Hold Times
Transparent mode of operation refers to the ability of the DP83222 to pass a given datastream
through without imposing any scrambling or descrambling on the data
(i e Data into Scrambler
Descrambler)
Mode ENC1 ENC0
1
2
3
4
0
0
1
1
TABLE II Datastream Encoding Truth Table
0
1
0
1
e
TL F 11885 – 10
Data out of Scrambler also Data into Descrambler
TL F 11885 – 8
TL F 11885 – 9
Expected Data Format Expected Data Format
FIGURE 7 ICC Diagram
(TXD and SCO)
PHY Interface
Transparent
NRZI
NRZI
NRZ
9
FIGURE 13 Descrambler Data Valid Time
FIGURE 12 Scrambler Data Valid Time
(RXD and DSCO)
FIGURE 11 ECL Transition Times
PMD Interface
Transparent
NRZI
NRZ
NRZ
e
Data out of
TL F 11885 – 7
TL F 11885 – 11
TL F 11885 – 12
TL F 11885 – 13