User manual

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IO_L91N_3 K14 OEN (LEON-3FT) 47
IO_L93N_3/VREF_3 K16 WRITEN (LEON-3FT) 46
IO_L93P_5 N7 RAMOEN0 66
IO_L93N_5 P7 RAMOEN1 67
IO_L92P_5 M6 RAMSN0 55
IO_L92N_5 M7 RAMSN1 54
5.2.7 SpaceWire Interfaces
5.2.7.1 LVDS Interface
The LVDS SpaceWire ports on the UT200SpW4RTR are connected to SpaceWire connectors
located closest to the Router device.
Table 4. LVDS SpaceWire to UT200SpW4RTR port connection table
SpaceWire Port (LVDS) Connector
1 P1
2 P4
3 P2
4 P3
Termination resistors are present on the receive signals of the LVDS SpW ports. The user is
cautioned to be sure to add 100Ω terminations resistors close to the router device when designing a
board. Termination resistors are not external and must be external to allow for proper operation of
the UT200SpW4RTR device.
5.2.7.2 LVCMOS Interface
The LVCMOS SpaceWire ports on the UT200SpW4RTR are connected to UT54LVDS031LV
LVDS Drivers. The UT54LVDS032LV LVDS receivers then run to the SpaceWire connectors
located furthest to the Router device. To enable the external LVDS Drivers and Receivers, the user
must use SW2 to enable or disable the UT54LVDS031LV and UT54LVDS032LV devices.
Table 5. LVCMOS SpaceWire to UT200SpW4RTR port connection table
SpaceWire Port (LVCMOS) Connector
1 P5
2 P6
3 P7
4 P8
Table 6. LVDS Driver UT54LVDS031LV Enable configuration
Enable Signal Input Output
EN /EN DIN DOUT+ DOUT-
L H X Z Z
L L H All other
combinations of
ENABLE signals
H H L