Okuma E4809-032-496-F Relay module

A new command is added to the 177BUG to assist the user in accessing the 4MB Flash memory array. However, the SFLASH command is valid only when jumper J8 is installed. SFLASH switches between the upper and lower half of the Flash array that appears in the visible address space. Two arguments are allowed: ❏ “L” to specifically select the lower half of Flash ❏ “U” for the upper half If no argument is entered, the switch will simply change from the current half to the opposite and display a message to indicate the change.

The SFLASH;L command has no effect on the destination address used by the PFLASH command. It is only a convenient way for the user to change which portion of the Flash memory array is in view. In this case PFLASH programs the flash beginning at the location of physical address ffa00000 when J8 is out. This copies the bug from ROM at physical address ff800000 into the upper half of flash.

The destination address DSAADR 

of the PFLASH command is always interpreted using the J8 removed mapping, all of Flash mapped in. See Figure B-1, Three Possible Mapping Options. This mapping is used whether or not J8 is installed and regardless of the most recent SFLASH command. This mapping is also used if a relative offset is supplied as the destination address. This treatment of the destination address allows the same PFLASH command to be used whether or not J8 is installed. It also allows programming the entire 4MB of flash or any portion with a single PFLASH command.

Additionally, both of these PFLASH 

commands do the same thing when J8 is removed as they do when J8 is installed, regardless of any SFLASH command that may have been executed. In the case where the bug is programming over itself the user will not regain the bug prompt. Successful programming is indicated by the FAIL LED blinking twice per second. If the programming fails or if the programmed image is corrupted then it is likely that the bug image in lower flash is corrupted and the only recourse is to replace J8 and execute the bug from ROM. For additional information on the PFLASH command consult the Debugging Package for Motorola 68K CISC CPUs User’s Manual.

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