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参数资料
| 型号： | S29CL032J0JFFM020 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 1M X 32 FLASH 3.3V PROM, 54 ns, PBGA80 |
| 封装： | 13 X 11 MM, 1 MM PITCH, LEAD FREE, FORTIFIED, BGA-80 |
| 文件页数： | 40/79页 |
| 文件大小： | 2994K |
| 代理商： | S29CL032J0JFFM020 |
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March 30, 2009 S29CD-J_CL-J_00_B3
S29CD-J & S29CL-J Flash Family
45
Data
She e t
Figure 9.3 PPB Erase Operation
9.3
Persistent Protection Bit Lock Bit
The Persistent Protection Bit Lock Bit is a global volatile bit for all sectors. When set to “1”, it locks all PPBs;
when set to “0”, it allows the PPBs to be changed. There is only one PPB Lock Bit per device.
Notes
1. No software command sequence unlocks this bit unless the device is in the password protection
mode; only a hardware reset or a power-up clears this bit.
2. The PPB Lock Bit must be set only after all PPBs are configured to the desired settings.
9.4
Dynamic Protection Bits
A Dynamic Protection Bit (DYB) is volatile and unique for each sector group and can be individually modified.
DYBs only control the protection scheme for unprotected sector groups that have their PPBs set to “0”. By
issuing the DYB Set or Clear command sequences, the DYBS are set or cleared, thus placing each sector
group in the protected or unprotected state respectively. This feature allows software to easily protect sector
groups against inadvertent changes, yet does not prevent the easy removal of protection when changes are
needed.
Notes
1. The DYBs can be set or cleared as often as needed with the DYB Write Command.
2. When the parts are first shipped, the PPBs are cleared, the DYBs are cleared, and PPB Lock is
defaulted to power up in the cleared state – meaning the PPBs are changeable. The DYB are also
always cleared after a power-up or reset.
3. It is possible to have sector groups that are persistently locked with sector groups that are left in
the dynamic state.
Either poll DQ6 in the
small bank and wait for
it to stop toggling OR
wait 20 ms
DQ0 = 0?
Write 0x60 to WP
Write 0x40 to WP
Read from WP
YES
NO
YES
NO
Done
Error
Write 0xAA to 0x555
Write 0x55 to 0x2AA
Write 0x60 to 0x555
5th attempt?
Note: Reads from the
small bank at this point
return the status of the
operation, not read array
data.
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