Acer Aspire Z1620 Acer Aspire Z1620 Desktop Service Guide - Page 42

Battery (N/A) Item Vendor & Model name Battery Type Pack capacity Number of battery cell Package configuration VRAM (N/A) Item Chipset Memory size Interface USB Port Item USB compliance level EHCI Specification Specification Specification 2.0 The PCH contains seven USB full/low-speed host controllers that support the standard Universal Host Controller Interface (UHCI), Revision 1.1. Each UHCI Host Controller (UHC) includes a root hub with two separate USB ports each, for a total of fourteen USB ports.  Overcurrent detection on all USB ports is supported. The overcurrent inputs are not 5 V tolerant, and can be used as GPIs if not needed.  The PCH'S UHCI host controllers are arbitrated differently than standard PCI devices to improve arbitration latency. USB EHCI Host Controllers (D29:F0 and D26:F0) The PCH contains two Enhanced Host Controller Interface (EHCI) host controllers which support up to fourteen USB 2.0 high-speed root ports. USB 2.0 allows data transfers up to 480 Mb/s. USB 2.0 based Debug Port is also implemented in the Ibex Peak 32