PPC7A Product Manual
Configuration
4-3
1
st
Edition
FLASH Write Enable Links (E3 and E9)
Each link enables or disables erasure/reprogramming of a section of the FLASH. E3 controls the User
FLASH and E9 controls the System FLASH. See Chapter 8 for details of FLASH operation.
S
ETTING
F
UNCTION
In
Enables erasure/reprogramming of the section of FLASH
Out (default)
Disables erasure/reprogramming of the section of FLASH
$
Note:
Regardless of any link settings for the FLASH write protection the Boot Recovery can’t be write enabled
and also the Boot data area can’t be write protected. See Chapter 8 for more details of these FLASH
areas.
VME Boot Link (E4)
This link holds the CPU in reset to allow a VME master to program boot code to the FLASH devices. To
program the boot code into the FLASH devices the VME master will need to program up both the
Universe and also the GT-64260 to allow a window from VME into the FLASH devices.
S
ETTING
F
UNCTION
In
VME programming mode
Out (default)
Normal boot mode
Use of this link relies on the default Universe II configuration (see the VMEbus Interface Configuration
section).
Overall FLASH Write Enable Links (E5)
This link enables or disables erasure/reprogramming of a both sections of the FLASH.
S
ETTING
F
UNCTION
In
Enables erasure/reprogramming of the FLASH
Out (default)
Disables erasure/reprogramming of the FLASH
$
Note:
To give more flexibility to the system builder, the FLASH can also be write enabled by linking pin A2 of
the P0 connector to Ground or Z1 of the P2 connector.
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