Kontron ePCI-101, User Manual, Page: 81 / 109

C-2
ePCI-101 User’s Guide
C.3 LANS and Serial Buffers Control
Address Action
D7 D6 D5 D4 D3 D2 D1 D0
Read EnLan1 EnLan0 NU RS485 RS232 ST1 VT100# DisVGA#
Write EnLan1 EnLan0 NU RS485 RS232 ST1 NU NU
0x190
Reset 1 1 X 0 1 0 X X
EnLan1 Enable LAN1. This bit can only be modified when bit LOCK is 0. For BIOS use.
EnLan0 Enable LAN0. This bit can only be modified when bit LOCK is 0. For BIOS use.
RS485 Serial port buffer control, see table below
RS232 Serial port buffer control, see table below
ST1 Serial port buffer control, see table below
VT100# When '0', VT100 mode is enabled
DisVGA# When '0', VGA is disabled
RS485 RS232 ST1 Description
0 1 X RS232 mode (default)
1 0 0 RS485/422 point-to-point mode.
- RX is always enable:
- TX enabled when COM2 RTS is asserted.
1 0 1 RS485 party line mode:
- RX enabled when COM2 RTS is deasserted,
- TX enabled when COM2 RTS is asserted.
1 1 X Illegal. This puts the buffers in RS232 mode.
0 0 X Illegal. This puts the buffers in RS232 mode.
This is the condition on power up. Value is changed by the BIOS.
C.4 Reset history and CpuFault
Address Action
D7 D6 D5 D4 D3 D2 D1 D0
Read PBRST
NU
WDO CpuFlt
NU NU NU NU
Write NU NU NU CpuFlt NU NU NU NU 0x191
Reset PBRST X WDO 1 X X X X
PBRST A pushbutton reset was trapped by the reset history circuit.
WDO A watchdog reset was trapped by the reset history circuit.
CpuFlt CPU Fault: a "1" indicate a fault by pulling pin CPUFAULT# to GND on the hardware monitor
connector. Set on reset by the hardware and cleared by the BIOS.
C.5 History Clear
Address Action
D7 D6 D5 D4 D3 D2 D1 D0
Read NU NU NU NU NU Lock MezzP ClrHis#
Write NU NU NU NU NU Lock MezzP ClrHis#
0x192
Reset X X X X X 1 1 1
Lock When bit lock is set (default), LANs enabled in register 0x190 are read-only.
This is for BIOS usage only. Leave this bit to '1'.
MezzP For BIOS use only. When a firmware hub mezzanine is present, clearing this bit will give the
onboard firmware hub address 0 (otherwise its 1 when the mezzanine is present).
ClrHis# Clear and bring back to 1 to clear the reset history.