S75WS256NDFBAWMB datasheet(107/216 Pages) SPANSION

107 / 216 page

February 17, 2005 S75WS-N-00_00_A0

S75WS256Nxx Based MCPs

105

Data

Sheet

The system then writes the starting address/data combination. This starting address is the first

address/data pair to be programmed, and selects the write-buffer-page address. All subsequent

address/data pairs must fall within the selected-write-buffer-page where Amax = 24 for RS512N.

The write-buffer-page is selected by addresses Amax - A5.

The write-buffer-page addresses must be the same for all address/data pairs loaded into

the write buffer. (This means Write Buffer Programming cannot be performed across multiple

write-buffer-pages. This also means that Write Buffer Programming cannot be performed across

multiple sectors. If the system attempts to load programming data outside of the selected write-

buffer-page, the operation will ABORT.)

After writing the Starting Address/Data pair, the system then writes the remaining address/data

paris into the write buffer. Write buffer locations may be loaded in any order.

Note that if a Write Buffer address location is loaded multiple times, the address/data pair counter

will be decremented for every data load operation. Also, the last data loaded at a location

before the Program Buffer to Flash confirm command will be programmed into the device. It is

the software’s responsibility to comprehend ramifications of loading a write-buffer location more

than once. The counter decrements for each data load operation, not for each unique write-

buffer-address location.

Once the specified number of write buffer locations have been loaded, the system must then write

the Program Buffer to Flash command at the Sector Address. Any other address/data write com-

binations will abort the Write Buffer Programming operation. The device then goes busy. The Data

Bar polling techniques should be used while monitoring the last address location loaded into

the write buffer. This eliminates the need to store an address in memory because the system

can load the last address location, issue the program confirm command at the last loaded address

location, and then data bar poll at that same address. DQ7, DQ6, DQ5, DQ2, and DQ1 should be

monitored to determine the device status during Write Buffer Programming.

The write-buffer embedded programming operation can be suspended using the standard sus-

pend/resume commands. Upon successful completion of the Write Buffer Programming operation,

the device will return to READ mode.

The Write Buffer Programming Sequence can be ABORTED in the following ways:

Load a value that is greater than the page buffer size during the Number of Locations to Pro-

gram step.

Write to an address in a sector different than the one specified during the Write-Buffer-Load

command.

Write an Address/Data pair to a different write-buffer-page than the one selected by the

Starting Address during the write buffer data loading stage of the operation.

Write data other than the Confirm Command after the specified number of data load cycles.

The ABORT condition is indicated by DQ1 = 1, DQ7 = Data# (for the last address location loaded),

DQ6 = TOGGLE, DQ5 = 0. This indicates that the Write Buffer Programming Operation was

ABORTED. A Write-to-Buffer-Abort reset command sequence is required when using the Write-

Buffer-Programming features in Unlock Bypass mode. [Use of the write buffer is strongly rec-

ommended for programming when multiple words are to be programmed.]

from the internal register (which is separate from the memory array)

18.8 Dynamic Sector Protection

The device offers data protection at the sector level and the DYB associated command sequences

disables or re-enables both program and erase operations in any sector or sector group.

Dynamically Locked—The sector is protected and can be changed by a simple command

Unlocked—The sector is unprotected and can be changed by a simple command

S75WS256NDFBAWMB bảng dữ liệu(PDF) 107 Page - SPANSION

S75WS256NDFBAWMB bảng dữ liệu(HTML) 107 Page - SPANSION

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL