Lvd Driver Characteristics; Lvd Receiver Characteristics; Figure 1.55 Lvd Transceiver Architecture - Fujitsu MBA3073 SERIES Technical Manual

The Pased transfer mode in detail is written in Subsection 1.6.5.3.
The Information unit trasfer in detail is written in Subsection 1.9.
1.12.4

LVD driver characteristics

The LVD driver shall provide balanced asymmetrical sources that provide current from positive
supply voltage to one signal line while sinking the same current to ground from the other signal
line as shown in Figure 1.55 Diagonally opposite sources operate together to produce a signal
assertion or a signal negation. An assertion is produced when positive supply voltage current is
sourced from source 4 to the +signal line and source 2 sinks the same current from the -signal line
to ground. A negation is produced when positive supply voltage current is sourced from source 1
to the -signal line and source 3 sinks the same current from the +signal line to ground.
Balanced transmissions occur when the changes in +SIGNAL current and the changes in the –
SIGNAL current precisely cancel each other. The balance is important to reduce EMI and
common mode signals. Asymmetry occurs when the intensity of the source 2 and 4 assertion pair
is different from the source 1 and 3 negation pair. To compensate for the negation biasing effect of
the terminators, the 2 and 4 assertion pair is stronger than the 1 and 3 negation pair.
1.12.5

LVD receiver characteristics

LVD receivers should be connected to the +signal and –signal as shown in Figure 1.56.
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LVD RECEIVER

Figure 1.55 LVD transceiver architecture

C141-C015