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CP6930-1User Guide
20
3.4
Write Protection Feature
The CP6930-1 supports hardware driven write protection for all non-volatile memory devices. Depending on the device, the
protection is implemented either by a dedicated write protection signal, by disabling the write enable signal, or the whole
interface.
Three levels of HW write protection are supported: unprotected, standard and enhanced write protection. The protection
level is chosen by the combination of the state of on-board jumper (FWPD, see chapter 3.6.4) and a backplane signal (EWP).
The backplane signal is located on connector J4, pin A9. If left open, the signal is inactive. If pulled to GND, the signal is
active.
The following table shows how to configure the desired write protection level. Default setting is 'standard'.
Standard write protection provides protection for Unit Computer Flash data, enhanced write protection provides protection
for all memories.
Table 3-3:
Write protection level set by FWPD and EWP
FWPD
Jumper
EWP
Signal
Write Protection Level
set
don’t care
unprotected
open
inactive (3.3V or open)
standard
open
active (GND)
enhanced
Table 3-4:
Non-volatile memories on the CP6930-1
Description
Protected by Level
Unit Computer Boot Firmware standard, enhanced
IPMI Firmware
enhanced
FRU Data
enhanced
Unit Computer Config EEPROM
enhanced
PM internal Flash
enhanced
