4001 JTAG points

[joe516]

JTAG points are on the 4001. VERY neat soldering required, but thats life, I'm afraid.

If you look at the 208pin processor (HD6417709) between the big pace chip (or altera flex on some models) and the battery, on the rear row of pins, the jtag points are as follows:

Pin 136 =TRST
Pin 137 =TMS
Pin 138 =TDI
Pin 139 =TCK
Pin 120 =TDO

You ned to find a 3v supply and Gnd seperately on the board- but thats easier than pie (they are verywhere).

The memory address locations of nvram, flash, loader etc can be found in engineers menu

not my work

 

[crackerchalk]

Hi
I think ill give that a miss
Thats harder to do than soldering to the nvram chip lol
How many pins along was i opps start again
Maybe someone in the know can find better points
ATM ill stick to the soic clip and led simm

 

[cosso1]

if we use these jtag points, which macro file do we use? is it the 4010?

 

[crackerchalk]

if we use these jtag points, which macro file do we use? is it the 4010?

No cos the addresses would be wrong
you ll need a working 4001 to dump
Which is a rare thing to see

 

[nozzer]

Also you need to check the version of the SuperH processor. Cant remember the exact details bit I think the A version used an interface that wasn't very Jtag compatible.

 

[crackerchalk]

Also you need to check the version of the SuperH processor. Cant remember the exact details bit I think the A version used an interface that wasn't very Jtag compatible.

Hi
not that ill be using or trying this idea
But could you explain a little more plz nozzer
How do you tell which version you have
Ive checked a couple and no.s are exactly the same
Will check a 4 chip simmed box later if i have a chance
Then if i get bored or run out of things to do
Ill trace the tracks for a better place to solder
Cos i dont think that processor can take much heat

 

[nozzer]

Its a long time since I looked at it but there are several different versions of the 7709 processor. Some have Jtag and some dont.

From the basics of what I remember the original core had Jtag but then they brought out an enhanced version (7709A I think) that had the Jtag replaced by some specialised Hitachi debug port (electrically similar but programatically very different to Jtag. It had no boundary scan facility as it was meant as an on chip debugger only).

I've also seen that even the original core came in two flavours. One with Jtag and a slightly cheaper option that had Jtag and some other functionality removed.

For details, you're going to have to try and find the relevent Hitachi datasheets. You'll need to make sure that you find info that covers all numbers on the actual processor used on your box including any prefix/suffix data.

Whats the actual numbers on your processor ?

Not having a box available I cant look myself.

 

[tip.top22]

I am readign this with interest.
I have a very old box which is HD6417709, but it also says SH30 107F808B
Does this mean it has the jtag points?

 

[crackerchalk]

Tip top
you sure those no.s are right
Just checked 6 boxes all the same
SH3,HD6417709, 0038, F80B
The 4 chipped simm box is different reading 9950
2 others have 0034 and 0F3
No A at all as yet ill check each 1 as they come back for movies
The no. thats different is the 1 on the top right if that helps

 

[chookey]

Tip top
you sure those no.s are right
Just checked 6 boxes all the same
SH3,HD6417709, 0038, F80B
The 4 chipped simm box is different reading 9950
2 others have 0034 and 0F3
No A at all as yet ill check each 1 as they come back for movies
The no. thats different is the 1 on the top right if that helps

SH3 is the core type, 0038 should be the manafacture date/batch code if these follow normal protocol. F80B is the version number. From what I've been able to discover so far this version seems to be jtag enabled. Most of the pin connections seem to have been left floating so would appear that the only way to test it would be to connect directly to the pins.

Chookey

 

[nozzer]

Remember, that even if you have a Jtag enabled processor then you are going to require a jtag program which specifically drives that particular processor.

This processor is not supported by OCD Commander or OCDemon etc

 

[rooney]

Remember, that even if you have a Jtag enabled processor then you are going to require a jtag program which specifically drives that particular processor.

This processor is not supported by OCD Commander or OCDemon etc

taken from another forum......


jtag is not present on the 4001.... sorry its not going to happen

the information was from a wrong datasheet which was for a version of the cpu which is NOT fitted to the 4001.

again, sorry to be the bearer of bad news.

 

[gentlex]

yep just read that too