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Intel® Server Board SE7520JR2 Functional Architecture
Revision 1.0
C78844-002
65
3.4.8.1 NIC Connector and Status LEDs
The 82546GB drives the two LEDs that are located on each network interface connector. The
link/activity LED to the left of the connector indicates network connection when on, and
transmit/receive activity when blinking. The speed LED to the right of the connector indicates
1000Mbps operations when amber, 100Mbps operations when green, and 10-Mbps when off.
3.4.9 USB 2.0 Support
The USB controller functionality integrated into ICH5-R provides the baseboard with the
interface for up to six USB 2.0 ports. Two external connectors are located on the back edge of
the baseboard. Two 10 pin internal on-board headers are provided which are each capable of
supporting an additional two optional connectors.
Legacy USB
The BIOS supports PS/2 emulation of USB 1.1 keyboards and mice. During POST, the BIOS
initializes and configures the root hub ports and then searches for a keyboard and mouse. If
detected, the USB hub enables them.
3.4.10 Super I/O Chip
Legacy I/O support is provided by using a National Semiconductor* PC87427 Super I/O device.
This chip contains all of the necessary circuitry to control two serial ports, one parallel port,
floppy disk, and PS/2-compatible keyboard and mouse. Of these, the Server Board SE7520JR2
supports the following:
• GPIOs
• Two serial ports
• Floppy Controller
• Keyboard and mouse controller
• Wake up control
3.4.10.1 GPIOs
The National Semiconductor* PC87427 Super I/O provides nine general-purpose input/output
pins that the Server Board SE7520JR2 utilizes. The following table identifies the pin and the
signal name used in the schematic:
Table 13: Super I/O GPIO Usage Table
Pin Name IO/GPIO SE7520JR2 Use
124 GPIO00/CLKRUN_L I/O TP
125 GPIO01/KBCLK I/O KB_CLK
126 GPIO02/KBDAT I/O KB_DAT
127 GPIO03/MCLK I/O MS_CLK
128 GPIO04/MDAT I/O MS_DAT
9 GPIO05/XRDY I/O TP
10 GPIO06/XIRQ I/O BMC_SYSIRQ
13 GPIO07/HFCKOUT I/O SIO_CLK_40M_BMC
1 GPIOE10/XA11 I/O,I(E)1 XBUS_A<11>