[Gb-ccb] ping

[Richard Lacasse]

Martin, Randy

The 3mm and 1cm receivers have ID jumpers in opposite places.  Somehow 
things have gotten reversed.  Below I present my logic.  I hope you two can 
figure out where we're going wrong.

Rich

Martin Shepherd wrote:

> Hi Rich,
> 
> On Mon, 7 Nov 2005, Richard Lacasse wrote:
> 
>> I just went up to look it over.  All the green status lights such as 
>> STATUS OK and FPGA DONE were *off* and  they shouldn't be.
> 
> 
> This may simply be that the manager hadn't yet connected.

Since the 3mm Manager is off...
> 
>> bunch of activity on the console TXD led.  When I got around to 
>> checking the console port it said, ccb3mm.gbt.nrao.edu login:   I was 
>> able to ping it as ccb3mm.  So it thinks its the 3mm ccb and the 
>> status LEDs are not operating correctly.
> 
> 
> It's appeared to be ccb3mm since I first logged in on Friday, after
> Chris and Wolfgang got it on-line,and my understanding was the manager
> worked at that time. I assumed that the 3mm cable was plugged in. What
> are the ID bits of the cable meant to be?

Here's how the cable is designed.

For the 1 cm receiver, pin 6 is open and pin 8 is grounded.
I just verified that this is the case with a meter.

Per the schematics, pin 6 corresponds to IP_ADDR_ID_0 and pin 8 to 
IP_ADDR_ID_1.  These pins are routed to some pull-up resistors and an 
inverter-buffer, U40, or sheet 8.

When the U40 is queried by the computer the ID_0 bit gets connected to the 
"SM /CFG_ERROR" bus which goes to scidyne connector pin 44, and labeled 
"PC4".  Similarly, ID_1 goes to the "SM CONFIG_DONE" bus which goes to 
scidyne connector pin 43 which is labeled PC5.  From that point on your 
software takes over.


> 
> Martin
>