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AV8 Digital Board
Introduction
Refer to circuit diagram L896 sheet 1
The AV8 digital board is the heart of the AV8 surround sound
decoder. It includes the H8S system control micro, the RS232
interface chip, the two Crystal DSPS one used for the surround
sound decoding the other for THX post processing, a SPDIF
receiver, four DACS, the bass redirection multiplexers and one
ADC along with the associated support circuits and Power
supply.
Connections
SK100 ADC input
Pin1 AGND
Pin2 Analogue right input
Pin3 AGND
Pin4 Analogue left input
Pin5 AGND
SK102 DAC output for left, right, centre and sub
Pin1 DACL
Pin2 DACGL
Pin3 DACR
Pin4 DACGR
Pin5 DACC
Pin6 DACGC
Pin7 DACS
Pin8 DACGS
SK103 DAC output for left / right surround and left / right
surround back
Pin1 DACLS
Pin2 DACGLS
Pin3 DACRS
Pin4 DACGRS
Pin5 DACLSB
Pin6 DACGLSB
Pin7 DACRSB
Pin8 DACGRSB
SK900 connections to video board
Pin1 VIDSD - video serial data
Pin2 DGND - digital ground via 22R
Pin3 VIDSCLK - video serial clk
Pin4 DGND - digital ground via 22R
Pin5 VIDCL - video comp latch
Pin6 VIDSL - video svid latch
Pin7 SPDIFL - spdif latch
Pin8 VIDZCS - video zone2 cs
Pin9 VIDOC - video osd cs
Pin10 Z2 VID - zone2 video in present
Pin11 OSDVID - osd video in present
Pin12 PROG - Program
Pin13 VSYNC - vsync
Pin14 DGND - digital ground via 22R
Pin15 VSYNCZ2 - vsync zone2
Pin16 DGND - digital ground via 22R
Pin17 CSYNC - comp sync
Pin18 DGND - digital ground via 22R
Pin19 SPDIFRX - spdif rxn
Pin20 DGND - digital ground via 22R
Pin21 RX DATA - rxdata
Pin22 SIGGND - signal ground
Pin23 TXDATA - txdata
Pin24 DGND - digital ground via 22R
Pin25 DEM1 - demod1
Pin26 DGND - digital ground via 22R
Pin27 DEM2 - demod2
Pin28 DGND - digital ground via 22R
Pin29 SPDIFATX - spdif adc tx
Pin30 DGND - digital ground via 22R
SK901 connections to display board
Pin1 0VF2GND
Pin2 P5VF2
Pin3 P36VF1
Pin4 0VF1GND
Pin5 DISPBLK
Pin6 DGND
Pin7 DISPLAT
Pin8 DGND
Pin9 DISPCLK
Pin10 DGND
Pin11 DISPDAT
Pin12 P3V3D
Pin13 FCK2 - fclock2
Pin14 FCK1 - fclock1
Pin15 DGND
Pin16 IRFP - irfp in
Pin17 LEDEN - led enable
Pin18 PHB - phase B
Pin19 PHA - phase A
Pin20 KEYB2 - keyB2
Pin21 KEYB1 - keyB1
Pin22 KEYB0 - keyB0
Pin23 P5VD
Pin24 KEYBL - keyboard latch
Pin25 DGND
Pin26 LEDL - led latch
Pin27 DGND
Pin28 KEYBCK - keyboard clock
Pin29 DGND
Pin30 KEYBD - keyboard data
SK902 connections to audio board
Pin1 PHINS - phones inserted 3V3
Pin2 DGND - digital ground via 22R
Pin3 AUDSD - aud sdata
Pin4 DGND - digital ground via 22R
Pin5 AUDSCK - aud sclock
Pin6 DGND - digital ground via 22R
Pin7 AUDSEL0 - aud sel 0
Pin8 DGND - digital ground via 22R
Pin9 AUDSEL1 - aud sel 1
Pin10 DGND - digital ground via 22R
Pin11 AUDSEL2 - aud sel 2
Pin12 DGND - digital ground via 22R
Pin13 AUDCTRL - aud control enable
Pin14 DGND - digital ground via 22R
Pin15 DGND - digital ground via 22R
Pin16 DGND - digital ground via 22R
Pin17 DGND - digital ground via 22R
Pin18 DGND - digital ground via 22R
Pin19 DGND - digital ground via 22R
Pin20 DGND - digital ground via 22R
Pin21 DGND - digital ground via 22R
Pin22 DGND - digital ground via 22R