Kontron COMe Starterkit Eval T2 Manual de usuario Pagina 207
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Appendix A: Deprecated Features
9.2. LPC Firmware Hub
An example of a Carrier Board Firmware Hub (FWH) implementation is shown in Figure 80: LPC Firmware Hub below. Use the FWH to store and
execute BIOS code.
A feature of the COM Express specification is the inclusion of the BIOS_DISABLE# pin. If this pin is pulled low on the Carrier Board, then the BIOS
on the Module is disabled. The BIOS can instead reside on the Carrier Board LPC or PCI buses. This is useful in some regulatory situations in which
it is required that regulatory technicians remove the BIOS, check its integrity, and replace it. There is usually room on a Carrier Board for a socketed
BIOS, whereas the Module BIOS is often a surface-mount device. The use of this feature is illustrated in the example below.
Figure 80: LPC Firmware Hub
PICMG
®
COM Express
®
Carrier Board Design Guide Draft Rev. 2.0 / December 6, 2013 207/218
ID0
ID1
ID2
ID3
FWH_RST#
FWH_RST#
VCC_3V3
VCC_3V3
VCC_3V3
VCC_3V3
CEX
LPC_AD0
CEX
LPC_AD1
CEX
LPC_AD2
CEX
LPC_AD3
CEX
LPC_FRAME#
CEX
BIOS_DISABLE#
CEX
CB_RESET#
CEX
LPC_CLK
short to enable
this FWH and
disable FWH on
CEX module
note: place serial resistor near CEX connector
J26
PLCC32
J26
PLCC32
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
R23 7 22RR23 7 22R
R156
10k
R156
10k
U23
74125
U23
74125
OE#
1
A
2
GND
3
Y
4
VCC
5
R14 7 10kR14 7 10k
C183
100n
C183
100n
R153
10k
R153
10k
R14 5 100kR14 5 100k
R14 6 10kR14 6 10k
R148
10k
R148
10k
J27J27
U34
74125
U34
74125
OE#
1
A
2
GND
3
Y
4
VCC
5
R150
10k
R150
10k
RN1
56R
RN1
56R
2
1
3
4 5
6
7
8
R154
10k
R154
10k
- 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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