MCS7840 controller equivalent, usb 2.0 to quad serial controller.
* USB-2.0 Device Controller
* On-Chip USB-2.0 PHY
* On-Chip Voltage Regulators
* Four 16c450/16c550 compatible UARTs
* Supports SIR IrDA Mode on any/a.
* Serial Attached Devices
* Modems, Serial Mouse, Generic Serial Devices
* Serial-Port Server
* Data Acq.
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