Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Thu, 28 Sep 95 23:20:15 JST

Hi,

In Message-Id: <[email protected]>, Furukawa-san wrote,

>Hello Yamamoto-san,
> 
>I'm sorry for my late message.
> 
>>>> In message <[email protected]> ,  Noboru Yamamoto <[email protected]>  wrote;
> 
>> After I sent a question to tech-talk, we found the following fact:
>> 
>> 	1) NI-1014 DMA can access VME address in A24 mode.
>> 	2) To accesse Main memory on FORCE cpu40 via VME bus, address mode
>> should be A32 mode.
>> 
>> These facts  means that the standard GPIB support routines in EPICS does not
>> work for this combination of boards. We happened to have memory board for VME
>> bus and allocated buffer space GPIB driver on this memory board. After that,
>> GPIB support routines are working.
> 
>Force CPU40 has A24 slave capability, while CPU30 does not.  
>Actually the A24 slave capability is implemented on an external 
>circuit outside VME gate array (FGA-002) for CPU30/40.  Thus 
>it isn't explained in the documentation of FGA-002 but in one 
>of CPU-40.
> 
>I use this sort of code fragment (on OS9) to initialize A24 
>slave access for A24 DMA. 
> 
>	p = (uchar *)0xff800c00;	/* pointer to PI/T1 */
>	*(p+0x03) = 0xff;		/* PB all output,        PBDDR */
>	*(p+0x09) = 0x80;		/* upper address in A24, PBDR */
>	p = (uchar *)0xff800e00;	/* pointer to PI/T2 */
>	*(p+0x04) = 0xa8;		/* PC7 output,           PCDDR */
>	*(p+0x0c) = 0x7e;		/* enable A24 slave,     PCDR */
> 
>This way, you may eliminate an external memory board.
> 
>Regards, Kazuro.
> 
OK. I read CPU-40/41 User's Manual carafully and found that it states 
its A24 slave capability. 

However, I could not find the way to use the "niPhysIo" routine in drvGpib.c 
for our configuration, yet. It uses VxWorks system function, sysLocalToBusAdrs,
to translate local(CPU) memory address to VME bus address with 
VME_AM_STD_SUP_DATA as a first argument. The function "sysLocalToBusAdrs"
returns ERROR, when it is called with VME_AM_STD_SUP_DATA, in VxWorks
for FRC40.

I need to consider little bit more to solve this problem with 
the least changes in the code.

Thank you for your advice.

Noboru Yamamoto
KEKB acclerator control group.
KEK, JAPAN

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System