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5.2 Nucleus 901: Audio User Dealer Loop
A PCM audio sine of 12kHz is generated in the Host
Decoder for a while and sent to the analogue board. The
signal coming from the analogue board is encoded again
and sent to the memory of the host decoder for
comparison. This nucleus tests the components on the
audio signal path:
• Host decoder
• Flex connection between connector 1602 (digital
board) and connector 1900 (analogue board)
• DAC
• Op-amp
• Scart switch IC
• ADC
• Audio Encoder
• VIP
• VSM
NUCLEUS 901: AUDIO USER DEALER LOOP
ANALOGUE BOARD
STV6410
7004
ADC
1900
connector
1602
connector
DIGITAL BOARD
I2S
7500
VIP
EMPRESS
Fig. 10
7507
7002
7100
DAC
1900
connector
1602
connector
I2S
7200
STI 5508
7403
7100
VSM
5.3 Nucleus 902: Digital Video Loop
A colourbar generated in the host decoder is looped
through the VIP, Empire, and VSM and checked again in
the host decoder. The following components are tested on
the video signal path:
• VIP
• Empire
• VSM
• Host decoder
NUCLEUS 902: DIGITAL VIDEO LOOP
ANALOGUE BOARD
STV6410
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
EMPRESS
Fig. 11
DRX-1
7507
7200
STI 5508
7403
7100
VSM
37
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