The MCS3253 is a specific part number from MosChip (pre-ASIX acquisition). Later ASIX equivalents: (PCIe to multi-I/O, software compatible).
| Byte | Value | Meaning | |------|-------|---------| | Base Class | 0x07 | | | Sub-Class | 0x00 | Serial Port (UART) | | Programming Interface | 0x05 | 16950 compatible (or higher) – indicates high-speed UART with 16650/16950 FIFO support, typically 128-byte FIFOs | pci\ven_1c00&dev_3253&cc_070005
The ID 1C00 is sometimes attributed to or listed as "Reserved / Vendor-defined" in older PCI databases, but actual hardware with this ID overwhelmingly points to PCIe to multi-I/O controllers from MosChip (now Asix Electronics) or Netmos designs. The MCS3253 is a specific part number from
This is a detailed technical write-up on the hardware identifier string: pci\ven_1c00&dev_3253&cc_070005
