Chapter 3
Hardware
30
Reference Manual
ReadyBoard 620
Note:
The I/O Hub has two reserved addresses.
Note:
The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Real Time Clock (RTC)
The I/O Hub contains a Real Time Clock (RTC), and an external Lithium Battery (B1) provides power for
the RTC and the CMOS RAM through connector BT1. The CMOS RAM is backed up with a Lithium
Battery. If the battery is not present or defective, the BIOS has a battery-free boot option to complete the
boot process.
Oops! Jumper (BIOS Recovery)
The Oops! jumper is provided in the event the user selected BIOS settings prevent the system from booting,
but does not reset CMOS or change the Time & Date in the BIOS. Refer to the CMOS Normal/Clear jumper
(JP7) to reset the BIOS and change the Time & Date.
By using the Oops! jumper, you can prevent the current BIOS settings in Flash from being loaded, forcing
the use of the default BIOS settings. Connect the DTR pin to the RI pin on Serial port 1 (COM 1) prior to
applying power to prevent the current BIOS settings from loading. After booting with the Oops! jumper in
place, remove the Oops! jumper and go into BIOS Setup Utility. Change the desired BIOS settings, or select
the default settings, and save the changes before rebooting the system.
To convert the Serial 1 interface to an Oops! jumper, short together the DTR (4) and RI (9) pins on the Serial
Port 1 DB9 connector as shown in
.
Figure 3-2. Oops! Jumper Connection
Temperature Monitoring
The ReadyBoard 620 performs CPU temperature monitoring through an integrated thermal diode in the
AMD CS5536 chipset. The CPU temperature monitor appears in the BIOS under the Hardware Health
Configuration selection of the Advanced menu.
I/O Hub
1000,100x
b
I/O Hub
0001,000x
b
Table 3-14. SMBus Signals Pin/Signal Descriptions (J20)
Pin #
Signal
Description
1
VCC5Dual
+5V standby voltage
2
SMBCLK
SMBus Clock
3
SMBDATA
SMBus Data
4
NC
Not connected
5
GND
Ground
NOTE
The ReadyBoard 620 CPU requires a heatsink.
Table 3-13. SMBus Reserved Addresses (Continued)
RB620_Oops!jump_b
Serial 1 (J6A) Lower Port
Standard DB9 Serial Port Connector
(COM1)
(Male)
Front View
5 4 3 2 1
9 8 7 6
Summary of Contents for ReadyBoard 620
Page 1: ...ReadyBoard 620 Single Board Computer Reference Manual P N 5001820B Revision B ...
Page 6: ...Contents vi Reference Manual ReadyBoard 620 ...
Page 44: ...Chapter 4 BIOS Setup Utility 38 Reference Manual ReadyBoard 620 ...
Page 46: ...Appendix A Technical Support 40 Reference Manual ReadyBoard 620 ...
Page 49: ...Index ReadyBoard 620 Reference Manual 43 references 1 weight ReadyBoard 620 12 ...