Artesyn ATCA-9405 Installation and Use (May 2014) - Manual (Page 84)

Service Processor
ATCA-9405 Installation and Use (6806800M71G) 84
By default, the P2020 boots from Boot Flash 1. An IPMI OEM command can be used to send a
message to the IPMC to change the boot device. The IPMC provides an IPMI sensor to control
the signal BOOT_SELECT. If the BOOT_SELECT signal is set high, the payload processor boots
from Boot Flash 2 after reset.
4.11 USB Interface
The P2020 provides an USB 2.0 compliant controller which can be configured to operate as a
stand-alone host or stand-alone device. The controller is enhanced host controller interface
(EHCI) compatible and supports high-speed (480 Mbps), full-speed (12 Mbps), and low-speed
(1.5 Mbps) operation. The USB interface requires an external PHY with a UTMI+ low pin count
interface.
The USB PHY is configured as host controller and connects to an USB hub in order to provide
multiple USB ports. A high-speed USB 2.0 hub controller is used. The device offers two
downstream ports supporting high-speed, full-speed, and low-speed operation.
The hub provides fully integrated USB termination and pull-up/pull-down resistors, over
current protection and power supply for the USB ports. USB port 1 is connected to an USB
connector at the front panel. USB port 2 is connected to an on-board eUSB Flash Drive.
4.11.1 USB Connector
One standard USB type A connector is provided at the face plate for USB access to the SP. For
connector pin out details, refer to
USB Port on page 39 .
Table 4-10 P2020 Boot Flash Selection
SW1-3
Boot from
debug header
SW1-1
IPMC or manual
boot selection
SW1-2
Manual SPI
Flash selection
IPMC
BOOT_
SELECT
SPI Flash 0
(Default)
SPI Flash 1
(Recovery)
Debug
Header
OFF OFF - LOW Selected
OFF OFF - HIGH Selected
OFF ON ON - Selected
OFF ON OFF - Selected
ON - - - Selected