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Apalis Carrier Board Design Guide
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Figure 6: PCIe x1 Slot Block Diagram
The Apalis module standard does not feature a dedicated PCIe reset output as it does not provide
the PCIe hot-plug functionality. Therefore, the PCIe reset input (PERST#, pin A11) of the slot should
be served by the general module reset output (RESET_MOCI#). Some Apalis modules may provide
the additional hot-plug signals such as reset and hot-plug detect as secondary functions or as type-
specific interfaces. Nevertheless, as the compatibility between different Apalis modules cannot be
guaranteed using these hot-plug signals, it is recommended that the RESET_MOCI# signal is used
as reset.
The PCIe x1 slot uses two card present signals (PRSNT1#, pin A1 and PRSNT2#, pin B18) which are
shorted to the ground by the card (if it is inserted). Again, as the Apalis module standard does not
feature the PCIe hot-plug feature, these pins can be left unconnected.
The wake output of the PCIe slot (WAKE#, pin B11) can be connected to the general wake input of
the Apalis module (WAKE1_MICO#). Wake-up-capable PCIe cards such as Ethernet cards can use
this signal to wake up the module from its suspend state.
The JTAG interface on the PCIe slot can be left unconnected. This interface is only used for
debugging purposes. No termination on the carrier board is needed.
The PCIe slot pin-out features an SMB interface for additional power management control. As the
SMB and I2C buses are compatible, it is recommended that the I2C1 interface on the Apalis
module is used if the SMB interface is needed. Most PCIe cards do not make use of the SMB
interface. Therefore, these pins can be left unconnected for most applications.
In addition to the 3.3V input, the PCIe slot features an addi3.3V aux (pin B10) and +12V
(pin A2, A3, B1 and B2). The +3.3V aux is a standby rail for cards that feature the wake up
functionality. If the card does not need to be powered in standby, it is recommended that this pin is
connected to the 3.3V supply. Do not leave this pin unconnected.
Not all PCIe cards need the +12V supply. For a battery powered system or a carrier board with a
wide voltage input range, it might be difficult to generate a regulated 12V rail. In this case, we
recommend checking with the PCIe card(s) manufacturer to determine if the +12V supply is
required.
PCIe
Device
PCIe
Host
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Apalis Module
Carrier Board
PCIe Card
TX
RX
RX
TX
P
PCIE1_TX-
P
PCIE1_RX-
P
PCIE1_TX-
P
PCIE1_RX-
HSOp(0)
HSOn(0)
HSIp(0)
HSIn(0)
2x 100nF
2x 100nF