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Chapter 3 Hardware
XTX 820 Reference Manual 25
Table 3-7. Simplified Audio Interface Pin/Signal Descriptions (J1)
J1 Pin # Signal Description
38 AUXAL
Auxiliary A input Left – This signal is normally used for an external CD-ROM
analog output or similar live-level audio source. Minimum input impedance is
5k Ohms and nominal input level is 1 volt RMS.
40 MIC
Microphone reference signal – This microphone input signal has a minimum
input impedance of 5k Ohms, and the maximum input voltage is 0.15 Vp-p.
42 AUXAR Auxiliary A input Right – This signal is normally used for an external CD-ROM
analog output or similar live-level audio source. Minimum input impedance is
5k Ohms and nominal input level is 1 volt RMS.
44 ASVCC Analog Supply Voltage – This test voltage is used for the sound controller, but
is not available for customer use.
46 SNDL Stereo Line Output Left channel – This output signal has a nominal level of 1
volt RMS into 10k impedance load. This output signal can not drive low-
impedance speakers directly.
48 ASGND Analog Ground – This ground is used for the sound controller and an external
amplifier to achieved the lowest audio noise levels.
50 SNDR
Stereo Line Output Right channel – This output signal has a nominal level of 1
volt RMS into 10k impedance load. This output signal can not drive low-
impedance speakers directly
Note: The shaded area denotes power or ground.
Table 3-8. Complete J1 Interface Pin/Signal Descriptions (J1)
Pin # Signal Description
1 GND Ground
2 GND Ground
3 PCICLK3 PCI clock 3 – This signal line is one of four signal lines. These clock signals
provide the timing outputs for four external PCI devices and the timing for
all transactions on the PCI bus.
4 PCICLK4 PCI clock 4 – Refer to pin-3 for more information.
5 GND Ground
6 GND Ground
7 PCICLK1 PCI clock 1 – Refer to pin-3 for more information.
8 PCICLK2 PCI clock 2 – Refer to pin-3 for more information.
9 REQ3* Bus Request 3 – This signal line is one of four signal lines. These signals
indicate to the arbitrator that the device desires use of the bus.
10 GNT3*
Grant 3 – This signal line is one of four signal lines. These signal lines
indicate access has been granted to the requesting device (PCI Masters).
11 GNT2* Grant 3 – Refer to pin 10 for more information.
12 +3.3V +3.3 volts +/-%5
13 REQ2* Bus Request 0 – This signal line is one of three signal lines. These signals
indicate the device desires use of the bus to the arbitrator.
14 GNT1* Grant 1 – Refer to pin 10 for more information.
15 REQ1* Bus Request 1 – Refer to pin 9 for more information.
16 +3.3V +3.3 volts +/-%5