M29W128 View Datasheet(PDF) - Numonyx -> Micron
Part Name
Description
Manufacturer
M29W128 Datasheet PDF : 78 Pages
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Command interface
M29W128FH, M29W128FL
5.2
5.2.1
Fast Program commands
The M29W128F offers a set of Fast Program commands to improve the programming
throughput:
● Write to Buffer and Program
● Double and Quadruple Word, Program
● Double, Quadruple and Octuple Byte Program
● Unlock Bypass.
See either Table 12, or Table 11, depending on the configuration that is being used, for a
summary of the Fast Program commands.
When VPPH is applied to the VPP/Write Protect pin the memory automatically enters the Fast
Program mode. The user can then choose to issue any of the Fast Program commands.
Care must be taken because applying a VPPH to the VPP/WP pin will temporarily unprotect
any protected block.
After programming has started, Bus Read operations in the memory output the Status
Register content. Fast program commands can be suspended and then resumed by issuing
a Program Suspend command and a Program Resume command, respectively (see
Section 5.1.8: Program Suspend command and Section 5.1.9: Program Resume command)
After the fast program operation has completed, the memory will return to the Read mode,
unless an error has occurred. When an error occurs Bus Read operations to the memory
will continue to output the Status Register. A Read/Reset command must be issued to reset
the error condition and return to Read mode. One of the Erase Commands must be used to
set all the bits in a block or in the whole memory from ’0’ to ’1’.
Typical Program times are given in Table 15: Program, Erase Times and Program, Erase
Endurance cycles.
Write to Buffer and Program command
The Write to Buffer and Program Command makes use of the device’s 64-Byte Write Buffer
to speed up programming. 32 Words/64 Bytes can be loaded into the Write Buffer. Each
Write Buffer has the same A22-A5 addresses.The Write to Buffer and Program command
dramatically reduces system programming time compared to the standard non-buffered
Program command.
When issuing a Write to Buffer and Program command, the VPP/WP pin can be either held
High, VIH or raised to VPPH.
See Table 15 for details on typical Write to Buffer and Program times in both cases.
Five successive steps are required to issue the Write to Buffer and Program command:
1. The Write to Buffer and Program command starts with two unlock cycles.
2. The third Bus Write cycle sets up the Write to Buffer and Program command. The setup
code can be addressed to any location within the targeted block.
3. The fourth Bus Write cycle sets up the number of Words/Bytes to be programmed.
Value N is written to the same block address, where N+1 is the number of Words/Bytes
to be programmed. N+1 must not exceed the size of the Write Buffer or the operation
will abort.
4. The fifth cycle loads the first address and data to be programmed.
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