| 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 |
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.
This is a detailed technical write-up on the hardware identifier string: pci\ven_1c00&dev_3253&cc_070005
After checking up-to-date PCI ID repositories: → Asix Electronics Corporation (formerly MosChip Semiconductor). Asix acquired MosChip's PCIe/PCI I/O controller line. Thus, the actual vendor is ASIX Electronics / MosChip . 3. Device Identification (DEV_3253) DEV_3253 corresponds to:
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 | |------|-------|---------|
This device is a common consumer chip; it's targeted at industrial automation, POS systems, embedded PCs, and expansion cards for legacy printer/serial device support. 4. Class Code Analysis (CC_070005) The PCI class code 07 00 05 breaks down as:
| Field | Value | |-------|-------| | | MosChip MCS3253 / ASIX AX99100? (or similar) | | Chip family | PCIe to dual UART + parallel port controller | | Function | Adds legacy I/O: 2 x RS-232 serial ports + 1 x IEEE1284 parallel port | Thus, the actual vendor is ASIX Electronics / MosChip
| Vendor | Details | |--------|---------| | (or Silan Integrated Circuit Co., Ltd.) | A Chinese semiconductor company. However, this specific vendor ID is also widely reused by PLX Technology (now part of Broadcom) for bridge devices, and by various third-party PCIe-to-serial/parallel bridge chips under the MCS (MosChip Semiconductor) or Oxford Semiconductor families. |