S29CD016G SPANSION, S29CD016G Datasheet - Page 56

• Manufacturer Part Number: S29CD016G
• Description: 16 Megabit (512 K x 32-Bit) CMOS 2.5 Volt-only Burst Mode / Dual Boot / Simultaneous Read/Write Flash Memory
• Manufacturer: SPANSION

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All PPB Erase Command
DYB Write
PPB Lock Bit Set
DYB Status
PPB Status
PPB Lock Bit Status
The host system must determine whether a PPB was fully programmed by noting
the status of DQ0 in the sixth cycle of the PPB Program command. If DQ0 = 0,
the entire six-cycle PPB Program command sequence must be reissued until DQ0
= 1.
The All PPB Erase command is used to erase all PPBs in bulk. There is no means
for individually erasing a specific PPB. Unlike the PPB program, no specific sector
address is required. However, when the PPB erase command is written (60h) and
A6 = 1, all Sector PPBs are erased in parallel. If the PPB Lock Bit is set the ALL
PPB Erase command does not execute and the command times out without eras-
ing the PPBs. The host system must determine whether all PPB was fully erased
by noting the status of DQ0 in the sixth cycle of the All PPB Erase command. If
DQ0 = 1, the entire six-cycle All PPB Erase command sequence must be reissued
until DQ0 = 1.
It is the responsibility of the user to preprogram all PPBs prior to issuing the All
PPB Erase command. If the user attempts to erase a cleared PPB, over-erasure
may occur making it difficult to program the PPB at a later time. Also note that
the total number of PPB program/erase cycles is limited to 100 cycles. Cycling the
PPBs beyond 100 cycles is not guaranteed.
The All PPB Erase command is permitted if the SecSi sector is enabled.
The DYB Write command is used for setting the DYB, which is a volatile bit that
is cleared at reset. There is one DYB per sector. If the PPB is set, the sector is
protected regardless of the value of the DYB. If the PPB is cleared, setting the
DYB to a 1 protects the sector from programs or erases. Since this is a volatile
bit, removing power or resetting the device clears the DYBs. The bank address is
latched when the command is written.
The DYB Write command is permitted if the SecSi sector is enabled.
The PPB Lock Bit set command is used for setting the DYB, which is a volatile bit
that is cleared at reset. There is one DYB per sector. If the PPB is set, the sector
is protected regardless of the value of the DYB. If the PPB is cleared, setting the
DYB to a 1 protects the sector from programs or erases. Since this is a volatile
bit, removing power or resetting the device clears the DYBs. The bank address is
latched when the command is written.
The PPB Lock command is permitted if the SecSi sector is enabled.
The programming of the DYB for a given sector can be verified by writing a DYB
status verify command to the device.
The programming of the PPB for a given sector can be verified by writing a PPB
status verify command to the device.
The programming of the PPB Lock Bit for a given sector can be verified by writing
a PPB Lock Bit status verify command to the device.
A d v a n c e
S29CD016G
I n f o r m a t i o n
S29CD016_00_A4 November 5, 2004