Mackie Digital 8-Bus Service Manual page 24

The clock card
The clock card generates the main clock signals used throughout the console. On other boards there
are a few local clocks used, for example, for the serial Rx and TX connection to the remote CPU.
This table shows the signal flow from the clock card to the various boards in the D8B. The clock card
fits into connector J23 on the backplane board. From there, the signals are distributed to other boards
either by ribbon connectors, or using the backplane's buses to the Tape cards, FX cards, and Digital IO.
Have a look at the schematics/pcb layouts of the clock card. The last page of that chapter has a pcb
layout with traces and some signals and voltages marked. Also refer to the connectors chapter for more
details of each connector mentioned in the table below.
SIGNAL
NAME
D_LRCLK
D_SCLK
D_FSYNC
SYNC_RX
SYNC_TX
B_SCLK
B_LRCLK
MCLK
SCLK
LRCLK
MUTE
RESET
UNMUTE
A_MCLK
A_SCLK
A_LRCLK
24
CLOCKS
BACKPLANE BACKPLANE
CONNECTION OUTPUT
J23, PINS 1+62 J21, PIN 1
J23, PINS 2+61 J21, PIN 3
J23, PINS 3+60 J21, PIN 5
J23, PINS 5+58 J32, PIN 5
J23, PINS 6+57 J32, PIN 7
J23, PINS 7+56 J17, PIN 8+55
J23, PINS 8+55 J17, PIN 13+50
J23, PINS 9+54 J22, PIN 9+54
J23, PINS 10+53 J22, PIN 10+53
J23, PINS 11+52 J22, PIN 11+52
J23, PINS 12+51 J15, PIN 1
J23, PINS 13+50 J15, PIN 3
J23, PINS 14+49 J24, PIN 27
J23, PINS 16+47 J15, PIN 9
J23, PINS 17+46 J15, PIN 7
J23, PINS 18+45 J15, PIN 5
DESTINATION
TO DSP BOARD
TO DSP BOARD
TO DSP BOARD
TO BRAIN BOARD
TO BRAIN BOARD
TO ALL FX CARDS (J17, J14, J16 AND J51, ALL
PIN 8+55)
TO ALL FX CARDS (J17, J14, J16 AND J51, ALL
PIN 13+50)
TO ALL TAPE CARDS AND EXTRA (J22, J20,
J19, J18, ALL PIN 9+54)
TO ALL TAPE CARDS AND EXTRA (J22, J20,
J19, J18, ALL PIN 10+53)
TO ALL TAPE CARDS AND EXTRA (J22, J20,
J19, J18, ALL PIN 11+52)
TO CODEC BOARD AND ALL TAPE CARDS,
EXTRA AND DIG IO (J22, J20, J19, J18 AND
J30, ALL PINS 12+51)
TO CODEC BOARD AND ALL TAPE CARDS,
EXTRA AND DIG IO (J22, J20, J19, J18 AND
J30 ALL PINS13+50) AND ALL FX CARDS (J17,
J14, J16 AND J51, ALL PIN 6+57)
TO DSP BOARD
TO CODEC BOARD
TO CODEC BOARD
TO CODEC BOARD