Motorola MVME166IG/D2 - Manual (Page 69)

Diagnostic Facilities
MVME166IG/D2 3-23
3
GCSR Method
A remote processor can initiate program execution in the local MVME166
dual-port RAM by issuing a remote GO command using the VMEchip2 Global
Control and Status Registers (GCSR). The remote processor places the
MVME166 execution address in general purpose registers 0 and 1 (GPCSR0
and GPCSR1). The remote processor then sets bit 8 (SIG0) of the VMEchip2
LM/SIG register. This causes the MVME166 to install breakpoints and begin
execution. The result is identical to the MPCR method (with status code B)
described in the previous section.
The GCSR registers are accessed in the VMEbus short I/O space. Each general
purpose register is two bytes wide, occurring at an even address. The general
purpose register number 0 is at an offset of $8 (local bus) or $4 (VMEbus) from
the start of the GCSR registers. The local bus base address for the GCSR is
$FFF40100. The VMEbus base address for the GCSR depends on the group
select value and the board select value programmed in the Local Control and
Status Registers (LCSR) of the MVME166. The execution address is formed by
reading the GCSR general purpose registers in the following manner:
The address appears as:
Diagnostic Facilities
The 166Bug package includes a complete set of hardware diagnostics intended
for testing and troubleshooting of the MVME166. These diagnostics are
completely described in the MVME167Bug Debugging Package User’s Manual.
To use the diagnostics, switch directories to the diagnostic directory. If you are
in the debugger directory, you can switch to the diagnostic directory by
entering the debugger command Switch Directories (SD). The diagnostic
prompt ("
166-Diag> ") appears. Refer to the MVME167Bug Debugging Package
User’s Manual for complete descriptions of the diagnostic routines available
and instructions on how to invoke them. Note that some diagnostics depend
on restart defaults that are set up only in a particular restart mode. The
documentation for such diagnostics includes restart information.
GPCSR0 used as the upper 16 bits of the address
GPCSR1 used as the lower 16 bits of the address
GPCSR0 GPCSR1