Chapter 2 87
Block Diagrams
Mnemonics and Connectors
Mnemonics and Connectors
Table 2-1 Mnemonic Descriptions
Mnemonic Description
(AUDIO_SPKR+) NC Speaker positive output from CPU board to motherboard - not used
(AUDIO_SPKR-) NC Speaker negative output from CPU board to motherboard - not used
(LINE_IN_L) AUDIO Left channel line level audio input to CODEC on CPU board from the audio output of the 4 option
board slots on the motherboard
(LINE_IN_R) AUDIO Right channel line level audio input to CODEC on CPU board from the audio output of the 4 option
board slots on the motherboard
10MHZ_AIF 10 MHz reference from reference board to analog IF board
10MHZ_CPU 10 MHz reference from reference board to CPU board
10MHZ_EXT_IN External reference input from rear panel BNC to reference board
10MHZ_EXT_OUT External 10 MHz reference output from reference board to rear panel BNC
10MHZ_OPT 10 MHz reference from reference board to the 4 option board slots on the motherboard
10MHZ_RF 10 MHz reference from the reference board to the top option board slot on the daughterboard
10MHZ_SYNTH 10 MHz reference from the reference board to the synthesizer board
50MHZ 50 MHz reference from the reference board to the RF board
300MHZ 300 MHz reference from the reference board to the RF board
ABUS Analog bus output from the synthesizer board to test point on the daughterboard
ACOM Analog ground (chassis)
AUDIO Line level audio output from the 4 option board slots on the motherboard to the CPU board
CALOSC_H Differential ECL 21.4 MHz calibration oscillator output from the analog IF board to the RF board
CALOSC_L Differential ECL 21.4 MHz calibration oscillator output from the analog IF board to the RF board
CLEAN_CK Serial bus clock signal from the serial bus bridge on the daughterboard to the top option slot on the
daughterboard
CLEAN_DATA Serial bus data signal from the serial bus bridge on the daughterboard to the top option slot on the
daughterboard
CLEAN_EN Serial bus enable signal from the serial bus bridge on the daughterboard to the top option slot on
the daughterboard
DAUGHTER_OTP Daughterboard thermometer chip output to the fan control board
DCOM Digital ground (single point ground inside the power supply)
DPT_TRIG1
DPT_TRIG2
FLOPPY_DCHGL Disk change signal from the floppy drive to the floppy controller chip on the CPU board
FLOPPY_DIRCL Direction signal from the floppy controller chip on the CPU board to the floppy drive
FLOPPY_DS1L Drive select #1 signal from the floppy controller chip on the CPU board to the floppy drive
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