
MC68F375
CDR MoneT FLASH FOR THE IMB3 (CMFI)
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
10-34
Table 10-16 Erase Interlock State Descriptions
State
Mode
Next
State
Transition Requirement
S1
Normal Operation:
Normal array reads and register accesses
The Block protect information and pulse width tim-
ing control can be modified.
S2
T2
Write PE = 1, SES = 1
S2
Erase Hardware Interlock Write:
Normal read operation still occurs
The CMFI will accept the erase hardware interlock
write.
This write may be to any CMFI array location
Accesses to the registers are normal register ac-
cesses.
A write to CMFICTL2 cannot set EHV at this time
A write to the register is not an erase hardware in-
terlock write and the CMFI shall remain in state S2.
S1
T1
Write SES = 0 or master reset
S3
T3
Hardware Interlock
Write to any CMFI array location is the
erase interlock write.
If the write is to a register the erase
hardware interlock write has not been
done and the CMFI shall remain in
state S2.
S3
High voltage write enable
Erase margin reads will occur
Accesses to the registers are normal register ac-
cesses.
A write to CMFICTL2 can change EHV.
S1
T6
Write SES = 0 or master reset
S4
T4
Write EHV = 1
S4
Erase Operation:
High voltage is applied to the array blocks to erase
the CMFI bit cells.
The pulse width timer is active if SCLKR[2:0]
≠ 0
and HVS can be polled to time the erase pulse
During erase the array will not respond to any ad-
dress.
Accesses to the registers are normal register ac-
cesses.
A write to CMFICTL2 can change EHV only.
S1
T7
Master reset
S5
T5
Write EHV = 0, write STOP = 1 or sys-
tem reset
S5
Erase Margin Read Operation:
These reads shall determine if the state of the bits
on the selected blocks needs further modification
by the erase operation.
Once a bit is fully erased it shall read as a 1.
All words within the blocks being erased must be
read to determine if erase is completed.
S4
T8
Write EHV = 1
S1
T9
Write SES = 0 or master reset
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.