HY29LV320 Datasheet, PDF (14/44 Pages) Hynix Semiconductor – 32 Mbit (2M x 16) Low Voltage Flash Memory

HY29LV320
START
RESET# = V_ID
WP#/ACC = V_IH
Wait 1 us
First Write Cycle:
Write 0x60 to device
TRYCNT = 1
Set Address:
A[20:12] = Address of Sector
Group to be Protected
A[6] = 0, A[1] = 1, A[0] = 0
Sector Group Protect:
Write 0x60 to Address
Wait 150 us
Verify Sector Group Protect:
Write 0x40 to Address
Read from Address
NO
Data = 0x01?
YES
Protect Another ^NO
Sector Group?
YES
TRYCNT = 25? ^YES
NO
Increment TRYCNT
RESET# = V_IH
Write Reset Command
SECTOR GROUP
PROTECT COMPLETE
DEVICE FAILURE
Figure 3. Sector Group Protect Algorithm
START
Note: All sector groups
must be protected prior to
sector unprotection
TRYCNT = 1
SNUM = 0
RESET# = V_ID
WP#/ACC = V_IH
Wait 1 us
First Write Cycle:
Write 0x60 to device
Set Address:
A[6] = 1, A[1] = 1, A[0] = 0
Sector Unprotect:
Write 0x60 to Address
Wait 15 ms
Set Address:
A[20:12] = Address of
Sector Group SNUM
A[6] = 1, A[1] = 1, A[0] = 0
Verify Unprotect:
Write 0x40 to Address
Read from Address
NO
Data = 0x00?
TRYCNT = 1000? ^YES
YES
YES
SNUM = 20?
NO
SNUM = SNUM + 1
NO
Increment TRYCNT
Figure 4. Sector Unprotect Algorithm
RESET# = V_IH
Write Reset Command
SECTOR UNPROTECT
COMPLETE
DEVICE FAILURE
14
r1.3/May 02