Download - StackPC Stackable Computers
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StackPC
Stackable Computers
June 1, 2012
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StackPC General Board Layouts
• StackPC Expansion Connector A
• PCI/104 Expansion Connector B
• FPE Expansion Connector B
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StackPC Expansion Connector AFunctionality:
• 4х1 PCIe - 4 root ports, 4 clocks
• 1x4 PCIe - 1 root port, 1 clock
• USB 2.0 - 6 ports
• SATA - 2 ports
• Gigabit Ethernet - 2 ports
• LPC
• FBUS - 2 ports
• SPI - 3 slaves
• SMB
• ATX power and control signals: +5V_SB, PS_ON#, POWERGOOD
• Power: +3.3V, +5V, +12V
Bottom Connector
Top Connector
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FPE Expansion Connector BFunctionality
• 1x16 PCIe or 2x8 PCIe or 2x4 PCIe - 2 root ports, 2 clocks
• Display Port - 1 port
• Configurable Section - User Defined
• Power: +3.3V, +5V, +12V
Top Connector Bottom Connector
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StackPC Approach
• StackPC specification defines only one direction for modules stacking. Following that definition, StackPC peripheral modules are stacked on top side of Host board (“Stack-Up only” configuration). This allows Host module to be more functional and more cost efficient. Host module may be on top or bottom of system stack depending from the whole system stack orientation.
• StackPC specification doesn’t limit Bottom side use. Additional Type 1 or Type 2 PCIe/104 connector can be used on Bottom side providing Stack-Down configuration option.
• Having most popular peripheral interfaces within stack connectors StackPC opens the door to the new area of Computer-On-Module (COM) like applications which were not addressed by other PC/104 family specifications
• Low speed SPI and FBUS ports allows cost effective peripheral modules which do not require speed of PCIe or USB. Ports can be used also as GPIO.
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“Stack Up only” approach• Stack-up is a System level approach. Applicable for PC/104 and
StackPC Specification implementations.
• Provides more real estate on CPU’s PCB since there is no requirement for CPU module to have Q2 connector on Top and Bottom.
• Provides more real estate for peripheral modules, reduces power consumption, simplifies layout, since there is no need for PCIe, USB and SATA switches.
• Reduces Cost.
• Allows more standardized and cost effective heat sink solutions.
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“Stack Up only” approach
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“Computer-On-Module” application• Most popular peripheral interfaces are within stack connectors
StackPC
• Unique feature of using StackPC CPU as a COM module is a possibility to add StackPC peripheral modules to the system .
• Tall components can be used both on StackPC CPU module and on carrier board.
• Reduces Cost.
• Allows more standardized and cost effective heat sink solutions.
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“Computer-On-Module” application
COM-application with standard StackPC Expansion Modules
COM-application without StackPC Expansion Modules
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StackPC Interfaces –USB2.0
StackPC does support 6 USB 2.0
Type 3 Advantages:
• Multiple USB2.0 can be used as user interfaces for standard peripherals and as board-to- board interconnect
• USB 2.0 as interconnect can be used for I/O applications (see right side as example)
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StackPC Interfaces –EthernetStackPC does support 2 GbE
Advantages:
• Less cables – easy to release at front / front panel
• POE support opportunity
• Match to COM Express specs and usage model
Example of add-on board for
application development with Ethernet
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StackPC Interfaces – SPI
StackPC does support up to 3 SPI
Advantages:SPI is supported by Intel, AMD, ARM, MIPS, PowerPC, AVR, PIC,…
SPI is used to talk to a variety of peripherals, such as:- Sensors: temperature, pressure, ADC, touchscreens, video game controllers
- Control devices: audio codecs, digital potentiometers, DAC
- Communications: USART, CAN, IEEE 802.15.4, IEEE 802.11
- Memory: Flash and EEPROM
- Real-time clocks
- LCD displays, sometimes even for managing image data
- Any MMC or SD cards
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Interfaces availability for Type 1, 2 PCIe/104 and StackPC
Feature Type 1 Type 2 StackPC
PCIe x 1 4 4 4
Express Card Interface - - 2
PCIe x4 2 2 1
PCIe x8/x16 1/2 - -
Ethernet - - 2
USB 2.0 2 2 2+4=6
USB 3.0 - 2 -
SATA - 2 2
LPC - 1 1
SPI - - 3
Fieldbus - - 2
RTC Battery - 1 1
Superior
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StackPC targets everything “Stackable”
A) StackPC in PC/104 Form-factor Stackable Industrial Computers
B) StackPC as an expansion bus for Single Board Industrial Computers. (EPIC, EBX, 3.5”, etc. form-factors)
C) StackPC CPU card as the mezzanine Computer-on-Module mounted on carrier board.
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Thank You