SMT118LT
User Manual
Version 1.0 Page 2 of 10 SMT118v2 User Manual
Revision History
Date Comments Engineer Version
11/02/05 First release GP 1.0
Version 1.0 Page 3 of 10 SMT118v2 User Manual
Table of Contents
Revision History.......................................................................................................... 2
Table of Contents....................................................................................................... 3
Block Diagram............................................................................................................ 4
Power Supply ............................................................................................................. 5
TIM sites..................................................................................................................... 6
JTAG....................................................................................................................... 6
CPU & I/O............................................................................................................... 6
Comm-ports............................................................................................................ 6
Reset.......................................................................................................................... 7
Board Size.................................................................................................................. 7
Connector Pin-Outs.................................................................................................... 8
CONN8 - RESET.................................................................................................... 8
CONN9 - JTAG....................................................................................................... 8
Connector Position..................................................................................................... 9
Safety ....................................................................................................................... 10
EMC ......................................................................................................................... 10
Physical Properties................................................................................................... 10
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Block Diagram
SMT118-LT
DSP
Slot 0
Master
ComPort Connections
0
1
3 0
4 1
3
4
2
I/O
Slot 1
Slave
I/O
Slot 2
Slave
8.5V to 16.5V
Source
DC-DC
Converter
3
4
5
DSP I/O 1 I/O 2
+3.3Volt
+5Volt
+12Volt
0
1
From the block diagram it can be seen that this is a simple three slot TIM carrier with
a CPU site and two I/O sites.
Each of the sections will be described in detail below.
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Power Supply
Power is supplied to the SMT118LT via the 4 pin connector HDR9 (referring to
connector position section, HDR9 is located at the top right of the drawing). A
minimum current of 200mA is required by the circuitry of the SMT118LT. The
maximum current will be dependant on other TIMs mounted on the SMT118LT.
The on-board supplies are generated by custom designed industry standard pincompatible 2” x 1” DC-DC converters. The 12V module is based around the
2186 device and includes an input voltage regulator to allow a maximum of an 18V
input. The 5 and 3.3V supplies are based around the
Micrel 2182 device and these
allow an input range from Vout+1.5 to 30V. The individual supplies are rated as
follows:
Micrel
Voltage rail
(Volts)
Minimum input
(Volts)
Max current delivery
(Amps)
3.3 4.5 5
5.0 6.5 5
12.0 7.0 1
These values imply a minimum board supply of 7.0V. The maximum input is 18.0V.
Note that a –12V supply is not provided as standard, but an option is available to use
a dual output 12 or 15 volt DC-DC converter which will be able to supply both positive
and negative supplies to the TIM sites. When this option is installed the board supply
voltage must be greater than 10V.
Individual LEDs are illuminated when each of the DC-DC converters becomes active.
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TIM sites
The SMT118LT has three TIM sites. None of the TIM sites include the global bus
connector.
JTAG
The JTAG chain includes all three TIM sites with the proviso that there must always
be a CPU module in SITE 1, or a module that connects TDI to TDO.
A standard 14-pin XDS510 compatible header (CONN9) is provided to allow
debugging.
In addition to the TI standard 14-pin JTAG header, there is a 20 way 0.050” pitch
high-density connector which allows direct JTAG connection to the
PCI TIM motherboards with embedded test bus controller.
CPU & I/O
There is no differentiation between the CPU and I/O TIM sites other than the JTAG
requirement mentioned above.
SMT310 series of
Comm-ports
Full Comm-port connectivity is provided using the following scheme:
With this method, a dual pipe exists between the modules in a 0-3 and 1-4 routing
fashion. Taking the global bus issues into consideration, three CPU TIMs could be
mounted on the SMT118LT and good Comm-port communications established.
No active or passive electronic circuitry is connected to these Comm-ports but in
normal operating conditions no signal is left un-driven for any length of time.
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Reset
As the SMT118LT is intended for stand-alone operation, then the system reset must
be provided locally. This is implemented by a device which monitors the 5V power
line and generates a system reset to all TIM sites and on-board peripherals for
approximately ½ second after the power line is stable.
In addition to this reset mechanism there is a reset push-button switch provided, and
the shorting of the reset pin to ground (see CONN8 in connector section) will also
cause a ½ second reset.
Board Size
The physical size of the board is 145mm x 210mm.
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Connector Pin-Outs
CONN8 - RESET
Function Pin Pin Function
RESET IN 1 2 GND
3 4
3.3V 5 6 GND
7 8
9 10
CONN9 - JTAG
Function Pin Pin Function
TMS 1 2 TRST
TDI 3 4 GND
PD(+5V) 5 6 KEY
TDO 7 8 GND
TCK_RET 9 10 GND
TCK 11 12 GND
EMU0 13 14 EMU1
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Connector Position
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Safety
This module presents no hazard to the user.
EMC
This module is designed to operate from within an enclosed host system, which is
build to provide EMC shielding. Operation within the EU EMC guidelines is not
guaranteed unless it is installed within an adequate host system.
This module is protected from damage by fast voltage transients originating from
outside the host system which may be introduced through the output cables.
Short circuiting any output to ground does not cause the host PC system to lock up
or reboot.
Physical Properties
Dimensions 211 x 145 mm
Weight 250g approx. (without TIMs).
Supply Voltage +7 to 18V
Supply Current Depends upon installed TIMs. See Power
Supply section.
MTBF
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