Lexicon
7-1
Chapter 7 The ory of Operation
NLX Backplane
This section describes the theory of operation of the 960L IO Backplane card.
Overview
The NLX PC form factor is an industry standard platform originally developed by Intel. The significant
difference between this form factor and other commodity PC form factors is that all system interconnect is
removed from the motherboard and located on a separate riser card. Since there are no cables connected
to the motherboard, it can be easily removed. The NLX backplane is a custom NLX riser card that Lexicon
developed to meet the needs of the integrated PC and its peripherals along with providing Lexicon specific
functionality not possible utilizing other standard PC form factors.
The 960L NLX backplane provides the interconnect between the PC motherboard, DSP cards on the PCI
bus, IDE hard drive, IDE CDROM drive, Floppy drive, IO backplane, and power distribution and
management functions. Communication between DSP cards and the IO cards in the system are provided
over a Lexicon proprietary control and audio interface using a second set of PCI style connectors. 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
Circuit Description
This section is a page by page description of the 960L NLX Backplane card schematic.
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