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17.2. Register Descriptions
17.2.1. Status Register 0 STAT0
Table 25: Status Register 0 STAT0
0x100
Bit
7
Name
FPPB
Access
R
Reset PS
na
FPPB: Front Panel Power Button – This bit is derived from internal signal shaping logic formed by helper state
machine PWBTN and represents current front panel power button status. A one in this bit means button is pressed
for longer than 50msec.
BBEI: BIOS Boot End Indication – This bit is set by BIOS after finishing booting, cleared otherwise. After this bit is set, it
cannot be cleared again by software. Clearing is done by reset events P and S.
BFSS[1:0]: Boot Flash Selections Status – This bit field indicates which Flash device is currently in use or referenced
and derived from rescue logic block.
Decoding of Flash selection status:
Table 26: Decoding of Flash selection status
BFSS[1]
0
0
1
1
17.2.2. Control Register 0 CTRL0
Table 27: Control Register 0 CTRL0
0x102
Bit
7
Name
-
Access
-
Reset PS
0
BFUS: Boot Flash Update Selection - The active SPI boot flash will be toggled each time if bit BFUS is written with 0 to
1 or 1 to 0. The active SPI boot flash can be read back via the Status Register 0, bit field BFSS.
The effective selection of rescue BIOS flash is indicated by red blinking rescue LED.
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Status Register 0 STAT0
6
5
BBEI
BFSS[1:0]
R/WO
R
0
na
BFSS[0]
0
1
0
1
Control Register 0 CTRL0
6
5
-
BFUS
-
R/W
0
0
4
3
-
-
R
R
0
0
Flash reference
Standard SPI boot flash
Recovery SPI boot flash
Reserved
Reserved
4
3
-
-
-
-
0
0
KBox C-102 - User Guide, Rev. 1.0
2
-
-
R
R
0
0
2
1
-
-
-
-
0
0
1
0
-
-
0
// 128
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