Hunt Engineering HEP40E User manual

HUNT ENGINEERING
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Brent Knoll, Somerset, TA9 4BP, UK
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URL: http://www.hunteng.co.uk
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HUNT ENGINEERING
HEP40E
TIM Motherboard for AT BUS
USER MANUAL
Hardware Rev A
Document Rev C
T. Hollis 29/6/99
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2 HUNT ENGINEERING HEP40E USER MANUAL
COPYRIGHT
This documentation and the product it is supplied with are Copyright HUNT
ENGINEERING 1999. All rights reserved. HUNT ENGINEERING maintains a policy
of continual product development and hence reserves the right to change product
specification without prior warning.
WARRANTIES LIABILITY and INDEMNITIES
HUNT ENGINEERING warrants the hardware to be free from defects in the material
and workmanship for 12 months from the date of purchase. Product returned under the
terms of the warranty must be returned carriage paid to the main offices of HUNT
ENGINEERING situated at BRENT KNOLL Somerset UK, the product will be repaired
or replaced at the discretion of HUNT ENGINEERING.
Exclusions - If HUNT ENGINEERING decides that there is any evidence of
electrical or mechanical abuse to the hardware, then the customer shall have no
recourse to HUNT ENGINEERING or its agents. In such circumstances HUNT
ENGINEERING may at its discretion offer to repair the hardware and charge for
that repair.
Limitations of Liability - HUNT ENGINEERING makes no warranty as to the fitness
of the product for any particular purpose. In no event shall HUNT
ENGINEERING’S liability related to the product exceed the purchase fee actually
paid by you for the product. Neither HUNT ENGINEERING nor its suppliers
shall in any event be liable for any indirect, consequential or financial damages
caused by the delivery, use or performance of this product.
Because some states do not allow the exclusion or limitation of incidental or consequential
damages or limitation on how long an implied warranty lasts, the above limitations may not
apply to you.
TECHNICAL SUPPORT
Technical support for HUNT ENGINEERING products should first be obtained
contacting your local supplier, if you are unsure of details please refer to
www.hunteng.co.uk for the list of current re-sellers.
HUNT ENGINEERING technical support can be contacted by emailing
[e-mail], calling the direct support telephone number [phone], or by
calling the general number [phone] and choosing the technical support option.

3 HUNT ENGINEERING HEP40E USER MANUAL
TABLE OF CONTENTS
INTRODUCTION........................................................................................................4
GETTING STARTED..................................................................................................5
PHYSICAL LOCATIONS OF ITEMS ON THE HEP40E........................................6
GENERAL DESCRIPTION OF INTERFACES........................................................7
RESET................................................................................................................................................. 8
JTAG (IEEE 1149.1) TEST INTERFACE................................................................10
System examples.......................................................................................................................... 10
CONFIG.....................................................................................................................11
IIOFS..........................................................................................................................12
COMPORT CONNECTOR ......................................................................................13
COMPORT CONNECTIONS ON THE HEP40E....................................................15
PINOUT OF JTAG CONNECTORS........................................................................16
PINOUT OF CONTROL CONNECTORS...............................................................17
PINOUT OF I/O CONNECTORS.............................................................................18
PHYSICAL DIMENSIONS OF THE BOARD.........................................................19
POWER REQUIREMENTS OF THE HEP40E.......................................................20
FITTING TIMS TO YOUR HEP40E .......................................................................21
CE MARKING...........................................................................................................23
TECHNICAL SUPPORT ..........................................................................................24

4 HUNT ENGINEERING HEP40E USER MANUAL
Introduction
The TMS320C40 is an extension of the very popular TMS320C30 processor. It benefits
from the addition of 6 Communications Ports. It has a peak performance of 60 Mflops and
275Mops, also 2 memory buses each capable of 100Mbytes/sec. The Comports operate at
20 MBytes/sec.
The TMS320C44 is a version with reduced addressing and only 4 comports.
Texas Instruments (the manufacturers of the TMS320C4x) have worked with a group of
third party developers (including HUNT ENGINEERING) to provide the TIM-40
specification. This allows for a multi-processor or parallel processing system to be put
together from 'building blocks' from many different manufacturers. This allows the easy
inclusion in a system of specialist modules that might only be available from a few
suppliers. Also a system can be built upon as the need arises or the budget allows.
The HEP40E is a PC-AT plug in card which is a motherboard for up to 4 Texas
Instruments Modules (TIMs) without providing an interface between the PC bus and the
TIM-40s.
The HEP40E supports the JTAG test interface as used by some software and debuggers
(notably the TI versions), only as a slave.
The HEP40E supports a global reset scheme for TIMs, as a slave. The reset is received on
a five pin input connector and a buffered version provides for linking to the next board on
a five pin output connector.
Hence the HEP40E can be used to build arbitrarily large networks of TIMs, when hosted
by a board such as the HEPC2E or HEV40 or HESB40
The HEP40E is a full-length AT card.
PLEASE NOTE THAT THE HEP40E REPLACES THE OLDER HEP40C, BUT IS
NOT SOFTWARE/HARDWARE COMPATIBLE WITH IT. OLDER VERSIONS OF
HEPC2 or HEPC2-M software tools WILL NOT WORK WITH THE HEP40E. The
only exception to this is the TI debugger software where the HEP40E retains
compatibility with the TI XDS510.

5 HUNT ENGINEERING HEP40E USER MANUAL
Getting Started
The HEP40E is a card that plugs into the expansion bus of a PC-AT machine. The
HEP40E comes configured ready to be fitted to your machine. If you have any TIMs to
add to it that have not been supplied at the same time by HUNT ENGINEERING, you
should follow the instructions on fitting these to your HEP40E before starting the
installation of the HEP40E.
First of all remove all power from the PC, then open the case to expose the expansion
slots.
Choose a vacant slot that has sufficient space around it for any special TIM modules or
cables that you have and remove the blanking plate (if fitted) from this slot, retaining the
screw safely for fixing the HEP40E.
Gently slide the HEP40E into the relevant slot ensuring that the 'tail' of the card is in the
card guide provided for it. DO NOT use excessive force on either the HEP40E or the PC.
When the HEP40E is almost pushed fully home the gold fingers should be carefully aligned
with the relevant connector in the PC and firmly pushed home.
The fixing screw should then be fitted to retain the HEP40E and any casings replaced on
the PC.
Reapply power to the machine and switch on. The machine should boot normally.

6 HUNT ENGINEERING HEP40E USER MANUAL
Physical Locations of Items on the HEP40E
Comport
Connectors
User jumpers
(Control In/Out,
JTAG In/Out
JTAG control
Reset & Config
Auto reset
TIM-40 slot 4
TIM-40 slot 3
TIM-40 slot 2
TIM-40 slot 1

7 HUNT ENGINEERING HEP40E USER MANUAL
General Description of Interfaces
The main interface on the HEP40E is the Comports. They use the Comport connector
that is standard to all HUNT ENGINEERING boards. At least one must be connected to
a "master" board to allow booting of the modules.
There are two host comport interfaces implemented on an HEPC2E, which are identical
except for their reset direction. They offer a simple I/O based connection from the ISA
bus to the 'C4x Comport.
The next major interface with the "master" board is the set of TIM-40 control signals. This
set comprises of a Global Reset in and a Config signal. This Config signal is defined in the
TIM-40 Specification as a signal that is connected to all processors in the system, which
each processor drives as a default after reset. As Software is booted onto each processor, it
removes the drive from this signal. Thus the host or any other processor or hardware can
use this signal as an indication that the system has booted and is ready. It is suggested that
any 'dangerous' hardware uses this signal to disable its 'dangerous' portion until everything
has booted successfully and there is definitely some control in place. The HEP40E reset in
must be driven by a master board, and if the config line is used this must be connected
together on all boards.
The third interface is the JTAG port. This allows the JTAG ports of the 'C4xs to be
exercised by the relevant software tools. Interconnection between boards is made using a
simple one-to-one 14 way cable, which is the same as the XDS510 type cable, so the
HEP40E can also be a slave of an XDS510 type debug system.
The topology chosen for the HEP40E is described in detail later but to enable the user to
configure their own system topology there are also a number Comport Connectors. These
allow for connections to other 'C4xs either on this board or on other boards.
The "optional" J3 connector allowed for in the TIM-40 specification is not implemented
on the HEP40E. The pinout of all of the TIM-40 connectors can be found in the TIM-40
specification.
Care must be taken when connecting to any of the C40 signals available on the TIM-40
connectors.
In particular HUNT ENGINEERING have carried out many experiments and believes
that the Comport connections MUST be buffered in all circumstances. This process of
course reduces the performance in terms of speed but provides essential reliability.
The HEP40E uses the second generation HUNT ENGINEERING comport buffering
scheme, the advantages of which include reduced power consumption and higher
bandwidth. These are NOT compatible with the earlier scheme used by HUNT
ENGINEERING or with schemes used by other vendors.
Other signals known to be sensitive to "abuse" are the H1 and H3 clock signals. These are
not used on the HEP40E.
The HEP40E uses the TIM-40 connectors FX4C-80S-1.27DSA which allows for no
components on the Motherboard, in the area under a module as defined in Table 3 in the
TIM-40 specification.
The height of components on the underside of the module, that can be tolerated by this
motherboard, are defined by the module connectors as defined in table 2 of the TIM-40

8 HUNT ENGINEERING HEP40E USER MANUAL
specification.
The HEP40E has a socketed crystal oscillator to drive the TIM-40 clock input. This is
buffered by the board, and can be fitted with whichever frequency you require your
modules to run at. Please note the use of this clock by the modules is optional, as they
might have their own Xtal oscillators.
This socket is intended for plastic bodied type oscillators such as type number SG531 from
Seiko Epson, which are in a 0.3" 8 pin DILtype body but with only 4 pins.
However a more conventional type of oscillator module in a metal can also be used, such
as the IQXO22C series from IQD.
The socket has four pins as shown below
Reset
There are two sources of reset on the HEP40E:
* 'Reset in' on the 5 pin control connector.
* 'Auto reset'.
Depending on the setting of the reset jumper, the reset used for all TIM modules and the
host comports can be selected. The 'Reset in' signal must be taken to a logic low to assert
the reset and high again to de-assert the reset. This signal must be driven at all times as a
floating reset signal will cause spurious operation. The inputs to the HEP40E reset are TTL
level inputs.
1
2 HEP40E Reset
3 Reset in
If 'Reset in' from the "Control in" connector is required then a jumper link should be fitted
between pins 2 and 3 of the reset select. If 'Auto reset' is required then no jumper should
be fitted to the reset select, but a jumper should be fitted on the "Auto reset" location.
The "Auto reset" will cause the TIM-40s to be reset for a short time after power up. This is
intended for use with the HUNT ENGINEERING FLASH modules to self boot a
system.
The HEP40E provides a buffered version on the "Control Out" connector which can be
3 = TTL frequency outGnd 2
4 = +5Voltsno-connect

9 HUNT ENGINEERING HEP40E USER MANUAL
used to drive further slaves without fanout problems. This is also a TTL level signal,
suitable for connecting directly to the reset input on any HUNT ENGINEERING
motherboard.
The TIM-40 reset is buffered and used to drive an LED labelled "RES" on the back of the
board near the control connector. This LED will illuminate when the TIMs are reset.

10 HUNT ENGINEERING HEP40E USER MANUAL
JTAG (IEEE 1149.1) Test Interface
The HEP40E can act as a JTAG slave (for its own TIMs, and optionally those on another
board).
The board has a JTAG input connector for use when the board is used as JTAG slave, and
a JTAG output connector which is used when not the last board in the JTAG chain. Three
jumpers are used to join up the scan path when this HEP40E is the last board on the
JTAG chain (they should only be fitted when this is the case).
Most conventional 'C4x debugging software uses a board.cfg file to define the number
of processors in the scan path, and to assign them names.
A typical entry in a board.cfg file would be
"CPU_0" TI320C40
The first entry in this file represents the last CPU in the chain, i.e. for two HET40SXs in
slots 1 & 2 of the HEP40E there would be two entries in the board.cfg file, and the
first one would represent the HET40SX in slot 2 of the HEP40E.
Please note that any empty TIM-40 slots will be automatically shorted out in the chain, so
an HEP40E with only 2 processing TIM-40s fitted to any two slots of the HEP40E will
only have 2 'C4xs in the scan chain. Also note that any multi-processor TIM-40s fitted will
need an entry for each processor.
Also I/O modules with no processor do not need to appear in the board.cfg file.
The board.cfg file must be "compiled" into the file board.dat using the "composer"
program.
System examples
1. Single board system, using remote debugging such as XDS510.
The three JTAG jumpers used to join up the scan path should be fitted.
Now the JTAG chain for the 4 TIM-40 slots on the HEP40E can be controlled via the
JTAG IN connector. This is a standard 14 way JTAG connector so can accept the cabling
from TI's XDS510 system or from other HUNT ENGINEERING products.
2. Multi board system, using the JTAG master interface.
The first board, such as a HEPC2E, should have the jumper labelled "JTAG MAST" fitted,
but the three JTAG jumpers in the top left of the board should not be fitted.
On the other HEP40E boards in the system the three JTAG jumpers in the top left of the
board should not be fitted. There should be a one to one connection from the JTAG
OUT connector of each board to the JTAG IN connector of the next board. Only on the
last board in the chain should the three JTAG jumpers used to join up the scan path be
fitted.
Now the JTAG chain for the TIM-40 slots on all of the boards in the connection can be
controlled by the JTAG MASTER.
PLEASE NOTE even when you are only using the debugging tools with the HEP40E but
not the Comport interface, there must be a valid reset connection to all processors.