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COM Express Interfaces
2.3.5.2. Reset
The PCI Interface of the COM Express Type 2 Module shares the reset signal 'PCI_RESET#'
with the PCI Express interface. PCI_RESET# is not available on all COM Express Module
Types. When design a carrier to support Module Types supporting PCI_RESET#, it is
recommended to use PCI_RESET# to generate PCIE_RESETn#. If the carrier supports COM
Express Module Types without PCI_RESET#, then it is recommended to use the COM Express
signal CB_RESET# as this signal is available on all COM Express pin-out types. The signal
PCIE_RESETn# in the schematics below is a buffered copy of either the PCI_RESET# or the
CB_RESET# signal. It is not the same signal as PCI_RESET#.
2.3.5.3. x1 Slot Example
An example of a x1 PCIe slot is shown in Figure 7 below. The source specification for slot
implementations is the PCI-SIG PCI Express Card Electromechanical Specification.
Figure 7: PCI Express x1 Slot Example
The example above shows COM Express PCIe lane 0 connected to the slot. Other lanes may be
used, depending on what is available on the particular Module being used.
No coupling caps are required on the PCIe data or clock lines. The PCIe TX series coupling
caps on the data lines are on the COM Express Module. The PCIe RX coupling caps are up on
the slot card.
Slot signals REFCLK+ and REFCLK- (pins A13 and A14) are driven by the Clock Buffer, which is
shown in Figure 6 'PCIe Reference Clock Buffer' on page 35. If there is only one PCIe target on
the Carrier Board, the Clock Buffer may be omitted and the slot REFCLK signals may be driven
directly by the COM Express Module.
The slot PERST# signal (pin A11) is driven by a buffered copy of the COM Express PCI_RESET#
signal. A buffered copy of CB_RESET# could also be used. If the Carrier Board only has one or
two target devices, an unbuffered PCI_RESET# or CB_RESET# could be used.
The slot signals PRSNT1# and PRSNT2# are part of a mechanism defined in the PCI Express
Card Electromechanical Specification to allow hot-plugged PCIe cards. However, most
systems do not implement the support circuits needed to complete hot-plug capability. If used,
the scheme works as follows: in Figure 7 above, PRSNT1# (pin A1) is pulled low on the Carrier
Board through R14. On the slot card, PRSNT1# is routed to PRSNT2# (pin B17). The state of
slot pin B17 may be read back by the BIOS or system software, if routed to an input port pin that
can be read by software. If a slot card is present, this pin reads back low; if the slot is empty, the
PICMG
®
COM Express
®
Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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PRSNT#1_SLOT0
PRSNT#2_SLOT0
VCC_3V3
VCC_3V3_SBY
VCC_12V
VCC_3V3
VCC_3V3
VCC_12V
PCIE_RESET1#
PCIE_CLK_REF0+
PCIE_CLK_REF0-
CEX
PCIE_TX0+
CEX
PCIE_T X0-
SMB_CK_S0
SMB_DAT_S0
CEX
WAKE0#
CEX
PCIE_RX0-
CEX
PCIE_RX0+
R14
0R
R15
4k7
TP1
Do Not Stuff
J1
XPCIEXPR1X
+12V
B1
+12V
B2
RSVD0
B3
GND
B4
SMCLK
B5
SMDAT
B6
GND
B7
+3.3V
B8
JT AG1
B9
3.3VAUX
B10
WAKE#
B11
RSVD1
B12
GND
B13
HSOp(0)
B14
HSOn(0)
B15
GND
B16
PRSNT#2
B17
GND
B18
PRSNT #1
A1
+12V
A2
+12V
A3
GND
A4
JT AG2
A5
JT AG3
A6
JT AG4
A7
JT AG5
A8
+3.3V
A9
+3.3V
A10
PERST#
A11
GND
A12
REFCLK+
A13
REFCLK-
A14
GND
A15
HSIp(0)
A16
HSIn(0)
A17
GND
A18
X2
X1
X1
X2
- COM Express® 1
- Carrier Design Guide 1
- Contents 3
- 1. Preface 8
- 1.6. Name and logo usage 9
- 1.7. Intellectual property 10
- Term Description 11
- 1.10. Schematic Conventions 15
- 2. COM Express Interfaces 16
- COM Expre ss Module 17
- Type 10 17
- Table 4: Pin-out Comparison 20
- , the PCI 30
- 2.3.5. Schematic Examples 34
- Signal Pin Description I/O 45
- Figure 15: ExpressCard Size 45
- 2.4.1. Signal Definitions 48
- 2.4.2. PEG Configuration 49
- 2.4.3. Reference Schematics 52
- DisplayPort is supported 55
- DisplayPort Example 56
- Figure 21: HDMI Example 57
- Figure 22: DVI Example 59
- SDVO Port Configuration 61
- Supported SDVO Devices 62
- DVI_SDAROM 63
- DVI_SCLROM 63
- SDVO I2C Bus Address 63
- Write = 0111 0000 (70h) 63
- Read = 0111 0001 (71h) 63
- 2.6.1. Signal Definitions 66
- Earliest asserted 1ms after 68
- 3.3V, 5V and 12V are stable 68
- 2.7. LAN 70
- 2.7.2. Reference Schematics 73
- 2.8. USB Ports 76
- 2.8.2. Reference Schematics 77
- 2.9. USB 3.0 81
- 2.9.1.3. USB 3.0 connector 83
- 2.9.2. Reference Schematics 84
- 2.10. SATA 87
- Pins Signal Description 88
- SATA Port 89
- 2.11. LVDS 91
- Term Definition 94
- 2.11.2. Reference Schematics 97
- 2.12.1. Signal Definitions 99
- 2.12.2. Reference Schematics 100
- 2.13. VGA 101
- COM Express Interfaces 102
- 2.14. TV-Out 104
- COM Express Module 106
- AUDIO POWER 107
- AUDIO CODEC - ALC888 107
- ANALOG I/O CONNECTOR 107
- 2.15.1.2. AC'97 108
- Figure 41: Audio Amplifier 109
- 2.16.1. Signal Definition 111
- SUPER I/O 115
- COM1/COM2 116
- 2.17.1. Signal Definition 118
- 2.18.1. Signal Definitions 121
- 2.18.2. Reference Schematics 121
- 2.19.1. Signal Definitions 123
- 2.20.1. Signal Definitions 125
- C O M 1 C O M 2 126
- 2.21. CAN Interface 127
- 2.21.2. Reference Schematics 128
- 2.22. Miscellaneous Signals 129
- POWER ATX 133
- POWER AT 133
- Type 2 Detection 133
- 2.22.5. Watchdog Timer 137
- G P IO C o n n e c t o r 141
- 2.22.8. Fan Connector 142
- 2.22.9. Thermal Interface 143
- 2.23. PCI Bus 147
- 2.23.2. Reference Schematics 148
- 2.24.1. Signal Definitions 153
- 3. Power and Reset 156
- 3.2.1. ATX vs AT Supplies 157
- 3.2.2. Power States 157
- Power and Reset 158
- 3.2.5. Power Button 162
- 3.4. Reference Schematics 164
- Table 55: ATX Signal Names 166
- ATX Signal Name Description 166
- 3.5. Routing Considerations 167
- 3.5.3. VCC5_SBY Routing 168
- 4. BIOS Considerations 170
- Type Height Partnumber Note 171
- COM Express Module Connectors 172
- GND Plane 173
- Power Plane 173
- COM Express 175
- Table 60: Trace Parameters 176
- Symbol Definition 176
- Carrier Board 178
- Parameter Trace Routing 183
- Extended 194
- 7.2. Heatspreader 195
- (Ø2.7mm bore hole) 196
- (M2.5 thread) 196
- (Ø2.7 bore hole) 197
- Mechanical Considerations 198
- 8.3. Useful books 202
- 9.1. TV-Out 203
- 9.1.5. Signal Termination 206
- 9.1.6. Video Filter 206
- 9.1.7. ESD Protection 206
- 9.2. LPC Firmware Hub 207
- Appendix C: List of Tables 213
- Appendix D: List of Figures 215
- Table 79: Revision History 217
- Revision Date Author Changes 217
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