# COM-HPC Server Base COM-HPC® Server Type Reference Carrier Board in Extended-ATX Form Factor ![Close-up of a black printed circuit board with various electronic components and connectors (no visible text or symbols)](.com-hpc-server-base-datasheet-20231101/8fc9072c5f3d1ead25581d49b77c9b2eabab8b350a899f35ea4667df3aa7527f.jpg) Specifications
COM-HPC Server Base
Core Module InterfacePICMG COM-HPC Revision 1.0Support Server Type module in Size E or Size D form factor
Dimension305 mm x 330 mm (Extended-ATX)
Expansion Busses2x PCI Express x4 slot (PCIe lane 0-3, 4-7)2x PCI Express x4 M.2 M-key connector (PCIe lane 8-11, 12-15)3x PCI Express x16 slot (PCIe lane 16-31, 32-47, 48-63)
POST LEDsOnboard IO expander for BIOS POST code data, on $I^{2}C$ bus
Secondary BIOSOnboard socket for secondary SPI flash
COM-HPC ConnectorsTwo x 400-pin (10mm height)
OCP Mezzanie like EthernetTwo connectors (B,C) on carrier at rearMezz_C: 4x KR input (ETH 0-3), supports ADLINK OCP Mezzanie like Ethernet cardMezz_B: 4x KR input (ETH 4-7), supports ADLINK OCP Mezzanie like Ethernet card
General Purpose LAN2500/1000/100/10BASE-T compatible RJ-45 on Rear I/O2500BASE-T depends on COM-HPC module
Remote Management LAN1000/100/10BASE-T compatible RJ-45 on Rear I/Osource from the Carrier BMC
Carrier BMCASPEED AST2500 provides VGA output, manages 5x system fans and out-of-band management through remote management LAN (TBC)
SATA2x SATA (depends on COM-HPC module)
USB4x USB 3.0/2.0/1.0 (USB 0-3) Type A connector on Rear I/O2x USB 2.0 header (USB 4-5, 6-7) for front panel usage1x USB 3.0 header (USBSS_2 by CPU, USBSS_3 by hub) for front panel usage
Serial Port1x DB-9 on rear I/O, 1x onboard 10-pin header
VGA Port1x VGA on rear I/O for development purposes(supported by Carrier BMC)
FAN1x 4-pin module fan connector (supported by COM-HPC module)4x 4-pin system fan connectors (supported by the Carrier BMC)
Feature ConnectorsHeader for SMBus, 2x I2C, eSPI, GP_SPI, 12x GPIO, IPMBHeader for front panel usageJumpers for module control signals
MiscellaneousPower button, reset button, status LEDs
Functional Diagram ![This block diagram illustrates the architecture of a **COM-HPC Server Base**.\n\n**Labeled Blocks:**\n* **Top Left:** 'IB Management LAN', '2x USB 3.0'\n* **Center Left:** 'OCP', 'VGA Monitor', 'FRU EEPROM', 'AST2500 IPMI BMC', '2x Thermal Sensor', '4x System FAN', 'COM0', 'COM1', '2x USB 3.0', 'OB Management LAN', 'ATX Power IN', 'AT Power IN'\n* **Interconnects/Clocks:** '10G SFI Re-timer', '10G KR/SFI MUX', 'BMC PCIe Clock', 'VGA', 'SPI', 'BIOS Socket', 'MUX', 'UART1', 'UART0', 'I2C_0', 'I2C_0_1, SMBus', 'USB 3.1 Gen2 Hub', 'MDI', 'i210' (two instances)\n* **J1 Column:** 'SATA 2x', 'NBASE-T 0', 'USB2.0_0, 1', 'USB3.1_0, 1', 'USB2.0_4, 5, 6, 7', 'ETH_KR 2x 4 (max. 25G/lane)', 'FAN(PWM#TACH)', '1x Module FAN', 'IPMB', 'PCIe_REFCLK_LO', 'PCIe Lane 8-11', 'M.2 PCIe x4', 'PCIe Lane 12-15', 'PCIe_REFCLK_HI', 'PCIe Lane 0-3', 'PCIe Lane 4-7', 'BOOT SPI', 'BMC PCIe', 'eSPI', 'I2C_0/I2C_1', 'SMBus', 'UART0', 'UART1', 'USB4/3 2x', 'USB2.0_3', 'USB3.1_3', 'USB2.0_2', 'USB3.1_2', 'LEDs', 'PWR BTN', 'I2C to I/O Expander', 'USB for Front Panel'\n* **J2 Column:** 'ETH_KR_CEI sideband', 'PCIe Lane 16-31', 'PCIe Lane 32-47', 'PCIe Lane 48-63'\n* **Far Right:** Three blocks labeled 'PCIe x16'\n\n**Connections:**\n* **IB Management LAN** connects to **i210**.\n* **2x USB 3.0** (top) connects to **USB2.0_0, 1**, **USB3.1_0, 1**, **USB2.0_4, 5, 6, 7**.\n* **OCP** connects to **10G SFI Re-timer**, **10G KR/SFI MUX**, **10G KR/SFI MUX**, and **BMC PCIe Clock**.\n* The SFI/MUX chain connects to **ETH_KR 2x 4 (max. 25G/lane)**.\n* **FAN(PWM#TACH)** connects to **1x Module FAN**.\n* **IPMB** connects to **IPMB**.\n* **VGA Monitor** connects via **VGA**.\n* **AST2500 IPMI BMC** connects to **FRU EEPROM**, **2x Thermal Sensor**, **4x System FAN**, **SPI**, **UART1**, **UART0**, **I2C_0**, **I2C_0_1, SMBus**, and **USB 3.1 Gen2 Hub**.\n* **SPI** connects to **BIOS Socket** (via **MUX**).\n* **BOOT SPI**, **BMC PCIe**, **IPMB**, **eSPI**, **I2C_0/I2C_1**, **SMBus** connect to **AST2500 IPMI BMC**.\n* **NBASE-T 0** connects to **OB Management LAN** (via **MDI** and **i210**).\n* **PCIe Lane 8-11** connects to **M.2 PCIe x4**.\n* **PCIe Lane 12-15** connects to **M.2 PCIe x4**.\n* **PCIe Lane 0-3** connects to **PCIe x4**.\n* **PCIe lane 4-7** connects to **PCIe x4**.\n* **UART0** connects to **COM0**.\n* **UART1** connects to **COM1**.\n* **USB4/3 2x** connects to **USB 3.1 Gen2 Hub**.\n* **USB 3.1 Gen2 Hub** connects to **USB2.0_3**, **USB3.1_3**, **USB2.0_2**, **USB3.1_2**.\n* **LEDs**, **PWR BTN** connect to **I2C to I/O Expander**.\n* **J2** **PCIe Lane 16-31** connects to top **PCIe x16**.\n* **J2** **PCIe Lane 32-47** connects to middle **PCIe x16**.\n* **J2** **PCIe Lane 48-63** connects to bottom **PCIe x16**.](.com-hpc-server-base-datasheet-20231101/6a47e4a86cb8fa634fa277101f698b37aff164a6804bf349e7c5b4ea042893b9.jpg) [🔗 Link to the original document](.com-hpc-server-base-datasheet-20231101/com-hpc-server-base-datasheet-20231101.pdf)