F71872 datasheet(18/115 Pages) FINTEK

18 / 115 page

July, 2007

V0.28P

F71872

6.3 PCI Reset and PWROK Signals

The F71872 supports 5 output buffers for 5 reset signals. If the register RSTCON_EN (5h) is set to 1, the pin

RSTCON# will infect PCIRST1# ~ PCIRST5# outcome. Then, the result of PCIRST# outcome will be affected by

conditions as below:

PCIRST1#

Output buffer of RSTCON# and LRESET#.

PCIRST2#

Output buffer of RSTCON# and LRESET#.

PCIRST3#

Output buffer of RSTCON# and LRESET#.

PCIRST4#

Output buffer of RSTCON#, LRESET# and PCIRSTIN#

PCIRST5#

Output buffer of RSTCON#, LRESET# and PCIRSTIN#

Delay

+3.3V

S3#

ATXPG

RSTCON#

PWROK1/2

RSTCON#

LRESET#

PCIRST1~3#

PCIRSTIN#

PCIRST4~5#

Delay

+3.3V

S3#

ATXPG

RSTCON#

PWROK1/2

RSTCON#

LRESET#

PCIRST1~3#

PCIRSTIN#

PCIRST4~5#

So far as the PWROK issue is as above figure. PWROK is delayed 400ms (default) as VCC arrives 2.8V,

and the delay timing can be programmed by register. (100ms ~ 400ms)

In the figure, the RSTCON# will be implemented by register RSTCON_EN. If RSTCON_EN be set to 0, the

RSTCON# pin will affect PWROK outputs. If RSTCON_EN be set to 1, the RSTCON# pin will affect PCIRST

outputs (Default).

6.4 Hardware Monitor

6.4.1

Analog Input

The F71872 provides 8 pins (8-bit) ADC voltage inputs. These input voltages should be positive and is

limited at range of 0v to 2.048V. The minimum resolution (1-LSB) is 8mV. If the voltage is over this range, the

divider resistor must be added and the divided voltage is also in the range of 0V to 2.048V.

The maximum input voltage of the analog pin is 2.048V because the 8-bit ADC has a 8mv LSB. Really, the

application of the PC monitoring would most often be connected to power suppliers. The voltage range of 0V to

2.048V can be connected to these analog inputs. The 3.3V and VSB5V should be reduced a factor with

external resistors so as to obtain the input range..

There are 8 voltage inputs in the F71872 and the voltage divided formula is shown as follows:

F71872 Datasheet(PDF) 18 Page - Feature Integration Technology Inc.

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