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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:
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:
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:
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 user is asked to verify the arguments entered.
The block number and physical address for each operation
(erasing, programming, and verifying) is displayed.
Programmed
Erased
Verified
ÒLÓ to specifically select the lower half of Flash
ÒUÓ for the upper half
Additions to FLASH Commands
B
B-51
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