Kollmorgen S31061-NA Driver module

Upon a reset/power-up condition the debugger asserts the VMEbus SYSFAIL* line (refer to the VMEbus specification). SYSFAIL* stays asserted if any of the following has occurred: ❏ Confidence test failure ❏ NVRAM checksum error ❏ NVRAM low battery condition ❏ Local memory configuration status 

❏ Self test (if system mode) has completed with error ❏ MPU clock speed calculation failure After debugger initialization is done and none of the above situations have occurred, the SYSFAIL* line is negated. This indicates to the user or VMEbus masters the state of the debugger. In a multi-computer configuration, other VMEbus masters could view the pertinent control and status registers to determine which CPU is asserting SYSFAIL*. SYSFAIL* assertion/negation is also affected by the ENV command.

MPU Clock Speed Calculation 

The clock speed of the microprocessor is calculated and checked against a user definable parameter housed in NVRAM (refer to the CNFG command in the Commands Table). If the check fails, a warning message displays. The calculated clock speed is also checked against known clock speeds and tolerances

❏ Target PC is initialized to the address corresponding to the beginning of the user space ❏ Target stack pointers are initialized to addresses within the user space ❏ Target Interrupt Stack Pointer (ISP) set to the top of the user space At power-up or reset, all 8KB of memory at addresses $FFE0C000 through $FFE0DFFF is completely changed by the 177Bug initial stack.

Memory Requirements

 The program portion of 177Bug is approximately 512KB of code, consisting of: ❏ Download ❏ Debugger ❏ Diagnostic packages and is contained entirely in EPROM. The EPROM sockets on the MVME177 are mapped starting at location $FF800000. 177Bug requires a minimum of 64KB of contiguous read/write memory to operate. The ENV command controls where this block of memory is located. Regardless of where the onboard RAM is located, the first 64KB is used for 177Bug stack and static variable space and the rest is reserved as user space.

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