Apalis Carrier Board Design Guide
Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l
l
Page | 25
Figure 19: Fast Ethernet with integrated magnetics reference schematic
2.4.3
Unused Ethernet Signals Termination
All unused Ethernet signals can be left unconnected.
2.5 USB
2.5.1
USB Signals
The Apalis standard features four USB interfaces. Two of them support the additional signals
required for USB 3.0 SuperSpeed. One of the USB interfaces features the additional signals that
are needed for OTG. The following table shows the possible features for each USB interface in the
Apalis module standard. Please note that not every Apalis module will feature all the four USB
interfaces or every USB feature. Please check the datasheet of the respective Apalis modules in
order to determine which features are supported.
Apalis Port
1.5Mbit/s
Low Speed
(1.1)
12 Mbit/s
Full Speed
(1.1)
480Mbit/s
High Speed
(2.0)
5Gbit/s
SuperSpeed
(3.0)
OTG
USBO1
USBH2
USBH3
USBH4
Table 8: Maximum possible supported features for the USB ports
The USBO1 is a SuperSpeed OTG capable interface. As most Apalis modules will use this USB port
for debugging and flash memory recovery, it is recommended that this interface is accessible even
for carrier board designs which do not need any USB interface. This USB port does not share any
signal with other ports and has its own power enable and overcurrent signals.
The additional data links for USB 3.0 SuperSpeed run at 5 Gbit/s and are fully compliant with the
PCI Express Base Specification, Revision 2.0. SuperSpeed signals support polarity inversion. This
means the positive and negative signal pins can be inverted in order to simplify the layout by
avoiding crossover of the signals. It is not permitted to swap the receiving signals with the
transmitting ones. The USB 2.0 data signals do not support polarity inversion; D+ and D- cannot
be swapped.
ETH1_LINK_ACT
ETH1_SPEED
ETH1_TX0_N
ETH1_TX0_P
ETH1[0..6]
ETH1_RXI_P
ETH_RXI_N
3.3V_SW
3.3V_SW
150R
R2
150R
R1
J00-0065NL
TD+
1
TD-
2
CT_TXD
4
CT_RXD
5
RD+
3
RD-
6
LED_Left_A
9
LED_Left_C
10
LED_Right_C
11
LED_Right_A
12
SHIELD
S1
SHIELD
S2
NC
7
CHS GND
8
X2
ETH1_TX0_P
ETH1_RXI_N
ETH1_RXI_P
SHIELD2
MM70-314-310B1
ET
50
Apalis - Gigabit Ethernet
2 of 25
ETH1_MDI0-
48
ET
56
ETH1_MDI1-
54
ET
32
ETH1_MDI2-
34
ET
38
ETH1_MDI3-
40
ETH1_ACT
42
ETH1_LINK
44
ETH1_CTREF
46
X1B
ETH1_TX0_N
ETH1_LINK_ACT
ETH1_SPEED
100nF
16V
C3
100nF
16V
C4
2A
220R@100MHz
L1
GND
ETH1_CTREF
ETH1_CTREF_TXD
ETH1_CTREF_RXD
100nF
16V
C2
0R
R3
0R
R4
GND
GND
ETH1_CTREF_ALL
47uF
6.3V
+C1
GND
ETH1_CTREF_TXD
ETH1_CTREF_RXD
ETH1_CTREF
NA
NA
NA
NA
NA