S71GS256 datasheet(69/195 Pages) SPANSION

69 / 195 page

December 15, 2004 S29GLxxxN_MCP_A1

S29GLxxxN MirrorBitTM Flash Family

Ad vance

Info rmat i o n

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. The host

system must therefore account for loading a write-buffer location more than

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

write-buffer-address location. Note also that if an address location is loaded more

than once into the buffer, the final data loaded for that address will be

programmed.

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 and data combination aborts the Write Buffer Programming oper-

ation. The device then begins programming. Data polling should be used while

monitoring the last address location loaded into the write buffer. DQ7, DQ6, DQ5,

and DQ1 should be monitored to determine the device status during Write Buffer

Programming.

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

program suspend/resume commands. Upon successful completion of the Write

Buffer Programming operation, the device is ready to execute the next command.

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 Program 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 se-

lected 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, and DQ5=0. A Write-to-Buffer-Abort Reset com-

mand sequence must be written to reset the device for the next operation. Note

that the full 3-cycle Write-to-Buffer-Abort Reset command sequence is required

when using Write-Buffer-Programming features in Unlock Bypass mode.

Write buffer programming is allowed in any sequence. Note that the Secured Sil-

icon sector, autoselect, and CFI functions are unavailable when a program

operation is in progress. This flash device is capable of handling multiple write

buffer programming operations on the same write buffer address range without

intervening erases. For applications requiring incremental bit programming, a

modified programming method is required, please contact your local Spansion

representative. Any bit in a write buffer address range cannot be pro-

grammed from “0” back to a “1.” Attempting to do so may cause the device

to set DQ5 = 1, or cause the DQ7 and DQ6 status bits to indicate the operation

was successful. However, a succeeding read will show that the data is still “0.”

Only erase operations can convert a “0” to a “1.”

Accelerated Program

The device offers accelerated program operations through the WP#/ACC pin.

When the system asserts VHH on the WP#/ACC pin, the device automatically en-

ters the Unlock Bypass mode. The system may then write the two-cycle Unlock

Bypass program command sequence. The device uses the higher voltage on the

WP#/ACC pin to accelerate the operation. Note that the WP#/ACC pin must not

S71GS256 датащи(PDF) 69 Page - SPANSION

S71GS256 датащи(HTML) 69 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

датащи скачать

ссылки URL