## uPD720100AGM-8ED: Overview and Electronic Specifications The **uPD720100AGM-8ED** is a high-performance USB 2.0 Host Controller manufactured by Renesas Electronics (formerly NEC). It is designed to interface between the PCI bus and USB devices, supporting the transmission speeds required for modern peripherals. --- ### 1. Key Technical Specifications The following table summarizes the core hardware parameters of the chip: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Renesas Electronics / NEC | | **Standard Compliance** | USB 2.0 (High Speed), OHCI/EHCI | | **USB Ports** | Up to 5 downstream ports | | **Interface** | PCI 32-bit, 33MHz (5V or 3.3V) | | **Data Rates** | 480 Mbps (HS), 12 Mbps (FS), 1.5 Mbps (LS) | | **Operating Voltage** | 3.3V I/O, 1.5V Core (requires internal LDO) | | **Package Type** | 160-pin Plastic LQFP (Low-profile Quad Flat Pack) | | **Operating Temp** | -40°C to +85°C (Industrial Grade -8ED suffix) | --- ### 2. Functional Architecture The device integrates several critical electronic components into a single SoC (System on Chip): * **EHCI (Enhanced Host Controller Interface):** Handles High-Speed (480 Mbps) USB 2.0 traffic. * **OHCI (Open Host Controller Interface):** Two internal OHCI controllers manage Full-Speed (12 Mbps) and Low-Speed (1.5 Mbps) traffic to ensure legacy compatibility. * **Physical Layer (PHY):** Integrated transceivers that convert digital signals into the differential analog signals required for USB D+/D- lines. * **PCI Bridge:** Manages DMA (Direct Memory Access) transfers between the USB ports and the system memory via the PCI bus. --- ### 3. Pin Configuration Categories The 160 pins of the uPD720100AGM are categorized as follows: 1. **PCI Interface Pins:** Standard signals like `AD[31:0]`, `C/BE[3:0]`, `FRAME#`, `IRDY#`, `TRDY#`, etc. 2. **USB Interface Pins:** Differential pairs for each port (e.g., `DP0/DM0` through `DP4/DM4`). 3. **Clock/Reset:** 30 MHz crystal input and system reset lines. 4. **Power Management:** Support for ACPI (Advanced Configuration and Power Interface) to manage power states (D0-D3). --- ### 4. Application Circuit Considerations When designing a PCB for this part, engineers must consider: * **Impedance Matching:** USB data lines must be routed as 90Ω differential pairs. * **Decoupling Capacitors:** Extensive use of 0.1µF and 10µF capacitors near power pins to filter high-frequency noise. * **Power Sequencing:** Ensuring the 3.3V and 1.5V rails stabilize correctly to prevent latch-up. ---