# COM-HPC Server Base COM-HPC® Server Type Reference Carrier Board in Extended-ATX Form Factor ![The image features the word 'Preliminary' written in white, bold, sans-serif text centered within a blue, tilted oval shape. A white curved swoosh design is visible at the bottom right edge of the blue oval.](.com-hpc-server-base-datasheet-preliminary-20210916-update-for-a2/2b166ae5da40e38c4c082917e318b82631b876f8da96c9020a257053820e74e1.jpg) ![Close-up of a black printed circuit board with various electronic components and connectors (no visible text or symbols)](.com-hpc-server-base-datasheet-preliminary-20210916-update-for-a2/cd7174107b6c6087ee4c0e47391f3d3c73a3274f33980f8b49eefbb35d4edece.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 Busses2 PCI Express x4 slot (PCIe lane 0-3, 4-7)2 PCI Express x4 M.2 M-key connector (PCIe lane 8-11, 12-15)2 PCI Express x16 slot (PCIe lane 16-31, 32-47)1 PCI Express x8 slot (PCIe lanes 48-55)
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 EthernetThree connector (A,B,C) on carrier on Rear sideMezz_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 cardMezz_A: x8 PCIe lanes input (PCIe lane 56-63) & NC-SI (from Carrier BMC), supports OCP Mezzanie 2.0 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 (supported by 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) for front panel usage (TBC)1x USB 2.0 vertical connector (USB 7, TBC)
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)5x 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 ![The flowchart depicts the connectivity of a carrier board system, divided by two vertical grey bars labeled **J1** and **J2**. The diagram details connections between peripheral blocks, a central BMC (Baseboard Management Controller) block, and expansion slots.\n\n**Labeled Blocks and Connections:**\n\n**Left Side (Inputs and Local Connections):**\n* **RJ-45 & 2-in-1 USB 3.0** connects to **NBASE-T** and **USB 3.0 port 0-1**.\n* **2-in-1 USB 2 Header** connects to **USB 2.0 port 4-5**.\n* **1x USB 2 Vertical** connects to **USB 2.0 port 7**.\n* **RJ-45 & 2-in-1 USB 3.0** (lower block) connects to **USB 3.0 port 2-3** and **LAN (i210)** (labeled **Remote Management Purposes Only**).\n* **COM (DB-9) VGA** connects to **UART 0**. It also connects via **RS232 Transceiver** and **Jumper** to the **Remote BMC Building Block**.\n* **5x System Fans** connects to **IPMB** (via a **Header** block) and directly to the **Remote BMC Building Block**.\n* **11x ADC (voltage monitor)** connects to the **Remote BMC Building Block**.\n* **UID Switch (TBC)** and **UID LED (TBC)** connect to the **Remote BMC Building Block**.\n* **BMC Button (for reset)** connects to the **Remote BMC Building Block**.\n* **COM (Header)** connects to **UART 1**. It also connects via **RS232 Transceiver** and **Jumper** to the **Remote BMC Building Block**.\n* **Port 80 LED** connects to **USB PD I2C**. It also connects via **GPIO Expander PCA9555** to the **Remote BMC Building Block**.\n* **RTC BAT** connects to the **Remote BMC Building Block**.\n* **Front Panel** connects to **LAN_LED, PWR_ON_LED, 5VSB, PWR_BTN, RST_BTN**.\n* **Temp Sensor** connects to **CARRIER_HOT#**.\n* A **Header** block connects to **eSPI**.\n\n**Central Block:**\n* **Remote BMC Building Block**: Contains **Soldered Memory**, **Carrier BMC AST2500**, **2x EEPROM**, and **JTAG connector**.\n\n**Right Side (Expansion and Outputs):**\n* **8x ETH_KR** connects to **OCP Mezz-like Card (Ethernet)**.\n* **PCIe 56-63** connects to **OCP Mezz-like Card (Ethernet)**.\n* **OCP Mezz-like Card (Ethernet)** connects to **ETH Sideband**.\n* **PCIe 8-11** connects to **M.2 M-key (2280/22110)**.\n* **PCIe 12-15** connects to **M.2 M-key (2280/22110)**.\n* **PCIe 0-3** connects to **PCIe x16**.\n* **PCIe x16** connects to **PCIe 16-31**.\n* **PCIe 4-7** connects to **PCIe x4 slot**.\n* **PCIe x16** connects to **PCIe 32-47**.\n* **PCIe x8** connects to **PCIe 48-55**.\n* **SATA 0** connects to **SATA**, which connects to **SATA DOM power**.\n* **SATA 1** connects to **SATA**, which connects to **SATA DOM power**.\n* **FAN_PWMOUT** and **FAN_TACHIN** connect to **Module Fan**.\n* **PWRBTN#** and **RSTBTN#** connect to **2x BTN**.\n* **GP_SPI** connects to **Header**.\n* **SMB** connects to **Header**.\n* **I2C 1** and **I2C 0** connect to **EEPROM**.\n* **12x GPIO** connects to **Header**.\n* **Front Panel** (via the line labeled **LAN_LED, PWR_ON_LED, 5VSB, PWR_BTN, RST_BTN**) connects to **12x GPIO** which leads to the **Header** block on the far right.](.com-hpc-server-base-datasheet-preliminary-20210916-update-for-a2/5ea86fa45de6ceba3e5452ef45dac1e8350b95a4ce564a9b9aff0b5c512ff5a8.jpg) [🔗 Link to the original document](.com-hpc-server-base-datasheet-preliminary-20210916-update-for-a2/com-hpc-server-base-datasheet-preliminary-20210916-update-for-a2.pdf)