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Additions to FLASH Commands
These addressing methods apply no matter which of the three mapping options is in effect when the PFLASH command is entered.
Two sets of information are reported to the user when the PFLASH command is executed:
❏The user is asked to verify the arguments entered.
❏The block number and physical address for each operation (erasing, programming, and verifying) is displayed.
PFLASH reports the current physical address and the absolute block number for the operation in progress. In other words, the messages displayed while Flash is being:
❏Programmed
❏Erased
❏Verified
may not appear to be based on the same destination starting address that was entered. This happens because the PFLASH command is needed to switch the portion of the Flash that is visible in order to program it. If switching is required, the map will be restored to the condition that existed before PFLASH was entered.
SFLASH Command
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:
❏ÒLÓ to specifically select the lower half of Flash
❏ÒUÓ 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.
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