5 lvds termination, 6 rbias resistor, 7 reset logic – BECKHOFF ET1100 User Manual
Page 105: Lvds termination, Rbias resistor, Reset logic, Figure 49: lvds termination, Figure 50: lvds load resistor, Figure 51: reset logic, Logic core
Example Schematics
Slave Controller
– ET1100 Hardware Description
III-91
9.5
LVDS termination
The LVDS termination with an impedance of 100
Ω is typically achieved by a resistor R
L
=
100 Ω. It is
only necessary for EBUS ports and should be placed adjacent to the EBUS_RX inputs.
EBUS_RX-
EBUS_RX+
R
L
=
1
0
0
R
ET1100
R
L
I+
R
L
I-
V
CC I/O
Figure 49: LVDS termination
9.6
RBIAS resistor
The LVDS RBIAS resistor should have a value of R
BIAS
=
11 kΩ.
1
1
K
RBIAS
ET1100
Figure 50: LVDS load resistor
NOTE: If only MII ports are used (no EBUS at all), the RBIAS resistor can be selected in the range of 10-15 k
Ω.
9.7
Reset Logic
Logic
Core
RESET
3
K
3
ET1100
V
CC I/O
Reset Other
Reset ET1100
Reset
Controller
Reset
ECAT Reset
Reg. 0x0040
Reset In
Reset Out
Optional
Optional
Power
Supervisor
V
CC I/O
V
CC Core
GND
I/O
Figure 51: Reset Logic