Atmel SpaceWire Router SpW-10X - Manual (Page 81)

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 DS reset
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.
When the LVDS drivers are deactivated the equivalent circuit of these outputs is a shown in Figure
8-2.
3.3 V
Out +
Out ‐
2850 Ω 2850 Ω
1725 Ω 1725 Ω
Vdd
Vss
Deactivated =
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.