960L Multi-Channel Digital Effects System Service Manual
7-6
and serial audio data and clock signals. R15, R16, and C1 provide filtering for the SYSTEM_RESET/ signal
provided by the DSP cards. The cards in the IO backplane can also interrupt the DSP cards by asserting
the IOBUS_INT/ signal. The ALL_MUTE/ signal is provided to allow for a hardware assisted system wide
mute. Pullup resistors, R28-R32 are provided to establish a default undriven signal level for signals
PWR_OK, IOBUS_INT/, IOBUS_DS/, IOBUS_AS/, ALL_MUTE/, respectively.
IO Backplane Slot Connectors
The IO backplane bus is comprised of the system control bus, serial audio clocks, serial audio data (in octal
format), MIDI pass thru connections, RS232 pass thru connections. Each IO card plugs into 96-pin EURO
style connectors, J1-J5.
TMIX1_SERD(3:0) 1:0/AIN, 3:2/DIN O Pullup
TMIX1_SERD(11:10) Expansion O Pullup
TMIX2_SERD(3:0) 5:4/AOUT/7:6(DOUT) I Pullup
TMIX2_SERD(11:8) Expansion I Pullup
TMIX_WCKI TMIX "512fs" clk O Active
TMIX_CKI/2 TMIX 256fs clock O Active
TMIX_CKI TMIX "wc" clk O Active
WCLK Master WCLK O Active
256FS Master 256FS O Active
128FS Master 128FS O Active
64FS Master 64FS O Active
SLOT_WCLK System WC 3st Active
SLOT_SEL/ One unique sel. per slot I
IOBP_ADDR(8:0) Control Bus Addr I
IOBP_DATA(7:0) Control Bus Data IO
RESET/ Master Reset I Pullup
Preview_WCK INT/ Preview Word Clock INT 3st Active
IOBP_RD/ Control Bus Read I On IOBP
IOBP_WR/ Control Bus Write I On IOBP
IOBP_AS/ Control Bus AS I On IOBP
PWROK Power OK I Pulldn
ALL_MUTE/ Panic Mute OD/OC Pullup
IOBP_DS/ XCVR EN I On IOBP
IOBP_INT/ Interrupt OD/OC Pullup
+12V From NLX Supply I
+5V From NLX Supply I
-12V From NLX Backplane I
GROUND From NLX Supply I
MIDI_TX From NLX IO Panel I
MIDI_RX From NLX IO Panel O
RS232 TX1 From NLX IO Panel I
RS232 TX2 From NLX IO Panel I
RS232 RX1 From NLX IO Panel O
RS232 RX2 From NLX IO Panel O
Table 2-1 IO Backplane Signal List
Slot Addressing
Decoder, U1, provide slot addressability by decoding the system control bus address signals ADDR11:9.
Each slot is allocated a 512 byte address space. The address map is as follows:
Slot 1(top) 0x000-0x1FF
Slot 2 0x200-0x3FF
Slot 3 0x400-0x5FF
Slot 4 0x600-0x7FF
Slot 5(bottom) 0x800-0x9FF
Table 2-1 Slot Address Map
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