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About the debug LED: The idea is that the LED will light amber/green when in reset (this is
hardware). As soon as the FPGA is programmed, the LED lights amber and is enabled for post-code
display (see bellow). If the BIOS fail, it is possible to read the post-code. If the BIOS succeed, it will
disable the post-code and enable HD activity on the green LED. If needed, the application software
can then disable hard disk activity reporting and directly control the bi-color LED for status
reporting.
How to read the 8-bit post-code:
•
Both color: start of post sequence
•
Amber blink: This is the high nibble. 0 to 15 blinks represent hexadecimal 0 to F.
•
Green blink: This is the low nibble. 0 to 15 blinks represent hexadecimal 0 to F.
B.7
0A02H: FWUM
Address
Action
READ
0xA02
WRITE
Reset
FWUM reset. This power-up state of this bit will be 0 under normal operating conditions. When the
RESET
manufacturing jig is present or jumper0 (force-on) is present, the power-up state will be '1'
(FWUM in reset).
FWUM mode pin.
MODE
Set this bit to connect UART1 to the FWUM for programmation.
UART
Set to 1 for manual rollback (in conjunction with DoProg)
RollBack
Leave to 0 for normal operation
Set to 1 then to 0 to start programming the IpmC with the new code.
DoProg
1 : FWUM Ready
Status
0 : FWUM Busy
D7
D6
D5
NU
NU
Status
NU
NU
NU
X
X
X
D4
D3
DoProg
RollBack
UART
DoProg
RollBack
UART
0
0
B-3
D2
D1
D0
MODE
RESET
MODE
RESET
0
1
0
AT8001 User's Guide
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