RadiSys PL35Q, Руководство по эксплуатации продукта, Страница: 31 / 72

3
I/O
31
I/O
SATA
The PL35Q motherboards provide four SATA headers to attach SATA disk drives via the SATA
controller on the ICH9/ICH9DO chipset. The blue SATA connector supports eSATA for use with
external devices at a distance of up to 2m.
Note: SATA interface transfer rates are independent of Ultra DMA mode settings in the BIOS
setup utility. SATA interface transfer rates will operate at the bus‘ maximum speed, regardless of
the Ultra DMA mode reported by the SATA device or the system BIOS.
UART
Q35 motherboards support two or four Fast UART serial ports, depending on product options,
via the Winbond W83627DHG Super I/O controller(s). The serial ports are headers for serial
port connectors on the chassis.
Serial port support includes:
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High-speed, 16550-compatible UARTs with 16-byte send/receive FIFOs
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Fully programmable serial interface characteristics
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Maximum baud rate for clock source 14.769MHz is up to 921Kbps. The baud rate at
24MHz is 1.5Mbps.
USB
Q35 motherboards support 12 USB 2.0/1.1 ports at a speed of 480 Mbps:
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Six USB ports on the rear I/O panel
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Two onboard USB ports and two onboard dual USB headers.
All USB ports support high-speed, full-speed, and low-speed operations. The ICH9/ICH9DO
chipset determines whether a USB port is controlled by a UHCI controller or by an EHCI
controller.
The BIOS provides emulations of standard USB keyboards and mice using SMI-based routines
to intercept traffic. Operating systems that do not support USB devices suffer performance
degradation due to this activity. Legacy support is automatically switched off once a USB-aware
operating system loads.