Datasheet

Functional Description
144 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
It is system BIOS’ responsibility to ensure that each port is mapped to only one over
current pin. Operation with more than one overcurrent pin mapped to a port is
undefined. It is expected that multiple ports are mapped to a single overcurrent pin,
however they should be connected at the port and not at Intel® Xeon® Processor D-
1500 Product Family pin. Shorting these pins together may lead to reduced test
capabilities. By default, two ports are routed to each of the OC[6:0]# pins. OC7# is not
used by default.
NOTES:
1. All USB ports routed out of the package must have Overcurrent protection. It is
system BIOS responsibility to ensure all used ports have OC protection.
2. USB Ports that are either unused or only routed within the system (such as, that do
not connect to a walk-up port) should not have OC pins assigned to them.
3.18 Integrated USB 2.0 Rate Matching Hub
3.18.1 Overview
Intel® Xeon® Processor D-1500 Product Family has integrated one USB 2.0 Rate
Matching Hubs (RMH). One hub is connected to the EHCI controllers as shown in
Figure 3-11. The Hub converts low and full-speed traffic into high-speed traffic. When
the RMH is enabled, it will appear to software like an external hub is connected to Port
0 of the EHCI controller. In addition, port 1 of each of the RMH is multiplexed with Port
1 of the EHCI controller and is able to bypass the RMH for use as the Debug Port.
The hub operates like any USB 2.0 Discrete Hub and will consume one tier of hubs
allowed by the USB 2.0 Specification. Section 4.1.1. A maximum of four additional non-
root hubs can be supported on any of Intel® Xeon® Processor D-1500 Product Family
USB Ports.
3.18.2 Architecture
A hub consists of three components: the Hub Repeater, the Hub Controller, and the
Transaction Translator.
1. The Hub Repeater is responsible for connectivity setup and tear-down. It also
supports exception handling, such as bus fault detection and recovery and connect/
disconnect detect.
Figure 3-11. EHCI with USB 2.0 with Rate Matching Hub