Atmel SpW-10X Manuel D’Utilisation
Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual
Date: 11
th
July 2008
Preliminary
81
DOUT
SOUT
DIN
SIN
Connection made
Data Transfer
Disconnect
Deactivated
Deactivated
Return NULLs
Disconnect
Detected
Data Received
NULL received
Activate output
Activate output
DS reset
Deactivate output
Deactivate output
Deactivated
Deactivated
Figure 8-1 Deactivate driver operating mode
Note the DOUT deactivate driver/disable is performed one CLK cycle before the SOUT deactivate,
avoiding any simultaneous transitions on Data or Strobe.
avoiding any simultaneous transitions on Data or Strobe.
When the LVDS drivers are deactivated the equivalent circuit of these outputs is a shown in Figure
8-2.
8-2.
3.3 V
Out +
Out ‐
2850 Ω
2850 Ω
1725 Ω
1725 Ω
Vdd
Vss
Deactivated =
NMOS
Transistors off
NMOS
Transistors off
Figure 8-2 Deactivated LDVS driver output
When external bias resistors are being used (see section 5.2.2) and a deactivated LVDS output is
connected to a powered LVDS input with external bias resistors the equivalent circuit is as shown in
Figure 8-3.
connected to a powered LVDS input with external bias resistors the equivalent circuit is as shown in
Figure 8-3.