Intel® Server Board SE7520JR2

Functional Architecture

3.4.8.1NIC 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.

3.4.9USB 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.

3.4.10Super 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

3.4.10.1GPIOs

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>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Revision 1.0

 

C78844-002

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