I/O Backplane; Introduction; Overview - Lexicon 960L Service Manual

960L Multi-Channel Digital Effects System Service Manual

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
RS232 : Com1
32MB SDRAM
RS232 : Com2
433MHZ CELERON
NLX Edge Connector
PCI DSP
Slot3 BUS
(Bottom) Slot3
MIDI Ensoniq MIDI
Slot
0(Top)
LARC2 IOCLK
7-4
6GB
HD
Primary IDE
Peripheral Buses
NLX Backplane
PCI Bus
DSP Bus
DSP DSP
PCI PCI
BUS BUS
Slot2 Slot1
Slot2 Slot1
Spare Slot Spare Slot
IO Backplane
Host Bus(Address/Data/Control)
Audio Bus(Octals, Clocks)
Slot 1 Slot 2
Spare AES
System Block Diagram
CRDOM 3.5" Floppy
Secondary IDE Floppy I/F
PCI DSP
Slot0 BUS IOBUS
(Top) Slot0 Conn.
RVB #1
IOBUS
Conn.
Slot 3 Slot 4
AIN AOUT
IOBUS
Conn.
IOBUS
Conn.