Lexicon 960L - I;O Backplane; Introduction; Overview

960L Multi-Channel Digital Effects System Service Manual
7-4
I/O Backplane
Introduction
This section describes the theory of operation of the 960L IO Backplane card.
Overview
The 960L IO Backplane provides the interconnect between the DSP cards located on the NLX Backplane
and the system clock and control, and audio IO cards which comprise a 960L effects system. It also
connects, via ribbon cables, the PC motherboard RS232 serial and MIDI ports to the IOCLK PCB. The
following system block diagram highlights its place within the 960L system.
NLX CPU
32MB SDRAM
433MHZ CELERON
NLX Backplane
Primary IDE Secondary IDE Floppy I/F
6GB
HD
CRDOM 3.5" Floppy
NLX Edge Connector
PCI
Slot3
(Bottom)
DSP
BUS
Slot3
IOBUS
Conn.
IOBUS
Conn.
PCI Bus
DSP Bus
PCI
Slot2
DSP
BUS
Slot2
PCI
Slot1
DSP
BUS
Slot1
PCI
Slot0
(Top)
DSP
BUS
Slot0
Peripheral Buses
Ensoniq MIDI Spare Slot Spare Slot RVB #1
RS232 : Com1
RS232 : Com2
IOCLK Spare AOUTAES AIN
MIDI
LARC2
IO Backplane
Host Bus(Address/Data/Control)
IOBUS
Conn.
IOBUS
Conn.
Slot
0(Top)
Slot 1 Slot 2 Slot 3 Slot 4
Audio Bus(Octals, Clocks)
System Block Diagram