Ampro Corporation MightyBoard 821 USB Interfaces, Mouse Interface, USB 2.0 Support, USB4 and USB5

Chapter 3 Hardware

Mouse Interface

The Super I/O chip (W83627HF) provides the signal lines for a PS/2 mouse through the mouse connector (J1B).

USB Interfaces

The I/O Hub (82801DBM) provides the USB solution for both legacy UHCI controllers and EHCI controller (USB 2.0) support. The I/O Hub (Southbridge) contains port-routing logic that determines which controller (UHCI or EHCI) handles the USB data signals. The PC-style (or Standard) connector (J11 B and C) provides two of the four USB ports, USB0 and USB1. The other PC-style (or Standard) connector (J13 B and C) provides the other two USB ports, USB2 and USB3. The Super I/O provides USB 4 and 5 on the J21 header.

USB 2.0 Support

The I/O Hub (Southbridge) contains an Enhanced Host Controller Interface (EHCI) compliant host controller, which supports up to four high-speed USB 2.0 Specification compliant root ports. The higher speed USB 2.0 specification allows data transfers up to 480 Mbps using the same pins as the four full-speed/ low-speed USB UHCI ports. The I/O Hub (Southbridge) port-routing logic determines which of the controllers (UHCI or the EHCI) processes the USB signals. The Super I/O provides USB 4 and 5 on the J21 header.

•One EHCI host controller for all four USB ports on connectors

•Supports USB v2.0 Specification

•Over-current fuses, located on the board, where USB0 and USB1 share a single fuse (F2), USB2 and USB3 share a single fuse (F4), and USB4 and USB5 share a single fuse (F1). See Table 2-3 on page 10.

Legacy USB Support

The I/O Hub (Southbridge) supports two USB Universal Host Controller Interfaces (UHCI) and each Host Controller includes a root hub with two separate USB ports each, for a total of four USB ports. The USB Legacy features implemented in the USB ports include the following:

•One root hub and two USB ports on connector

•One root hub and two USB ports on connector

•Supports USB v1.1 and UHCI v1.1 with integrated physical layer transceivers

•Supports improved arbitration latency for UHCI controllers

•UHCI controllers support Analog Front End (AFE) embedded cell instead of USB I/O buffers to allow for USB high-speed signaling rates

•Three shared over-current fuses, located on the board, are used on all six USB ports

USB4 and USB5

Table 3-6describes USB 4 & 5 J21 with 10-pins, two rows, Odd/even (1, 2) and 2mm pin spacing.

Table 3-6. USB Ports 4 & 5 Interface Pin/Signal Descriptions (J21)

Pin #	Signal	Description
1, 2	+5V	+5V through a fuse (F3). Also over current monitor line.
3	USBP3-	Universal Serial Bus 2	Negative
5	USBP3+	Universal Serial Bus 2	Positive
4	USBP4-	Universal Serial Bus 3	Negative

MightyBoard 821 Reference Manual 21