Nlx Interface (Sheet1); Pci Interface (Sheets 2, 3, 4); Io Connectors (Sheet 5); Miscellaneous Connectors (Sheet 6) - Lexicon 960L Service Manual

960L Multi-Channel Digital Effects System Service Manual

NLX Interface (Sheet1)

J6 is a standard NLX riser card connector. This interface contains the signal interconnect for the following
functions:
PCI Bus (The 960L support up to 4 PCI slots)
ISA Bus (not supported by 960L)
Primary (Hard Drive) and Secondary IDE (CDROM) Interfaces
Floppy Interface
Power, supply, management and control

PCI Interface (Sheets 2, 3, 4)

Sheet 3 contains the series termination resistors for various PCI signals. This sheet also contains the
pullups for the slot specific signals (e.g. GNT/, REQ/, IRT/, ...).
Sheet 4 and 5 are the PCI slot connectors. The 960L support the 5V PCI, v2.2, standard. Slot addressing
and identification are accomplished through standard PCI bus algorithms. In PCI parlance, Slot 0(IDSEL0)
is the topmost PCI slot in the 960L and Slot 3(IDSEL3) is the bottommost slot. This is significant in that not
all NLX motherboards support four (4) PCI slots. From a mechanical standpoint (i.e. least mechanical keep
out constraints), the top slots are the most valuable in that the PCB in these slots can support more surface
area (i.e. more real estate = more functionality per slot) and the least significant slots (i.e. Slot 0, 1, ...) are
supported first by NLX motherboards. For a detailed understanding, please refer to the PCI Specifications,
V2.2.

IO Connectors (Sheet 5)

Sheet 5 contains the ISA interface (J5), primary (J9) and secondary (J8) IDE and floppy drive(J7) interface
connectors. The ISA bus connector is not populated, as the current NLX motherboard no longer supports
ISA. By convention, the primary IDE interface is connected to the hard drive and the secondary interface is
connected to the CDROM drive. The 960L, 3.5", HD, floppy drive is connected to the floppy drive connector,
J7.
The actual hardware that supports all of these interfaces resides on the NLX motherboard itself.

Miscellaneous Connectors (Sheet 6)

Much of the circuitry on this page is not populated. It was originally included for experimental or future use.
This includes components: J18, J16, U2, U1, J17, J25, J19, J23, J24, and the resistors and capacitors
associated with them.
The only functionality which is in use are power on and reset circuits. J20 connects the front panel
standby/power switch and LED to the NLX backplane. This switch is a momentary type which signals the
NLX motherboard to either turn on or turn of the power by pulsing the SOFT_ON_OFF/ control signal. The
NLX motherboard lights the power on LED accordingly.
A standard PC hard reset signal is provided. A momentary switch on the inside of the 960L chassis behind
the front panel connects to the NLX backplane via J21.
IOBUS & Power Connectors (Sheet 7)
The NLX backplane and the IO backplanes are connected by two 40-pin ribbon cables, which connect to
J14 and J15. This interface is comprised of an 8-bit, non-multiplexed address and data system control bus
and serial audio data and clock signals. 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.
The power provided by the NLX power supply comes in on connector, J26. This is an NLX standard
connector and pinout. The power connectors provide, +/-5x, +3.3v, +/-12v, and +5VSB supply rails. NLX
supplies can be remotely controlled. The NLX motherboard is capable of shutting off the power supply by
7-2