Ampro Corporation XTX 820 Manual Do Utilizador
Chapter 3
Hardware
XTX 820
Reference Manual
51
Table 3-27. SMBus Reserved Addresses
Matrix Component
Address Binary
Memory & Graphics Hub (82915GM)
1010,010x
b
DDR2 RAM EPROM
1010,000x
b
Clock Generator (UICS954201)
1101,001x
b
I/O Hub (82801FBM)
0000,000x
b
(default) Programmable
Table 3-28. Complete J4 Interface Pin/Signal Descriptions (J4)
Pin #
Signal
Description
1
GND1
Ground
2
GND3
Ground
3
5V_SB
5 volt Suspend – This control signal is sent to the ATX power supply for a
suspended or standby state.
suspended or standby state.
4
PWGIN
Power Good In – This active high input signal indicates to the XTX 820,
the power is good and it can begin the boot process.
the power is good and it can begin the boot process.
5
PS_ON
Power Supply On – This active-low output signal from the XTX 820 is sent
to the ATX power supply from the to turn it on.
to the ATX power supply from the to turn it on.
6
SPEAKER
Speaker – This PC speaker output signal must be connected to a speaker
(piezoelectric or dynamic) on the baseboard to hear the output (beeps).
(piezoelectric or dynamic) on the baseboard to hear the output (beeps).
7
PWRBTN*
Power Button – This signal provides a ground temporarily through an open
collector driver to the ATX power supply to change states (turn it on).
collector driver to the ATX power supply to change states (turn it on).
8
BATT
Battery Voltage – This is the + battery connection to the baseboard for +3
volt lithium backup battery used to power RTC operation and CMOS
non-volatile memory.
volt lithium backup battery used to power RTC operation and CMOS
non-volatile memory.
9
KBINH
Keyboard Inhibit – This pin disables data input from the keyboard when
asserted.
asserted.
10
LILED
Link Integrity LED – The LINK LED pin indicates link integrity. If the
link is valid in either 10 or 100 Mbps, the LED is on; if the link is invalid,
the LED is off.
link is valid in either 10 or 100 Mbps, the LED is on; if the link is invalid,
the LED is off.
11
RSMRST*
Resume Reset – This signal is driven low by external circuitry to reset the
power management logic on the XTX 820.
power management logic on the XTX 820.
12
ACTLED
Activity LED – The Activity LED pin indicates either transmit or receive
activity. When activity is present, the activity LED is on; when no activity
is present, the activity LED is off.
activity. When activity is present, the activity LED is on; when no activity
is present, the activity LED is off.
13
NC
Not Connected (ROMKBCS*)
14
SPDLED
Speed LED – The speed LED pin indicates the speed. The speed LED will
be on at 100 Mbps and off at 10 Mbps.
be on at 100 Mbps and off at 10 Mbps.
15
EXT_PRG
External Programming – This pin is used when handling external flash
programming.
programming.
16
I
2
CLK
I
2
C Clock – This clock line supports the I
2
C bus.
17
VCC1
+5 volts +/-5%
18
VCC3
+5 volts +/-5%
19
OVCR*
Over Current Detect – This signal indicates a USB over-current condition.
20
NC
Not Connected (GPCS*)
21
EXTSMI*
Extern System Management Interrupt – This signal is provided by external
circuitry to initiate an SMI event with the XTX 820.
circuitry to initiate an SMI event with the XTX 820.