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S71WS512NC0BAWE70 데이터시트(HTML) 47 Page - SPANSION

부품명 S71WS512NC0BAWE70
상세내용  Stacked Multi-Chip Product (MCP)
Download  188 Pages
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제조사  SPANSION [SPANSION]
홈페이지  http://www.spansion.com
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S71WS512NC0BAWE70 데이터시트(HTML) 47 Page - SPANSION

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September 15, 2005 S71WS-N_01_A4
S71WS-Nx0 Based MCPs
45
Advance
Information
The ACC pin must not be left floating or unconnected; inconsistent behavior of the device may
result.
ACC locks all sector if set to VIL; ACC should be set to VIH for all other conditions.
10.5.8
Unlock Bypass
The device features an Unlock Bypass mode to facilitate faster word programming. Once the de-
vice enters the Unlock Bypass mode, only two write cycles are required to program data, instead
of the normal four cycles.
This mode dispenses with the initial two unlock cycles required in the standard program command
sequence, resulting in faster total programming time. The “Command Definition Summary” sec-
tion shows the requirements for the unlock bypass command sequences.
During the unlock bypass mode, only the Read, Unlock Bypass Program and Unlock Bypass Reset
commands are valid. To exit the unlock bypass mode, the system must issue the two-cycle unlock
bypass reset command sequence. The first cycle must contain the bank address and the data 90h.
The second cycle need only contain the data 00h. The bank then returns to the read mode.
The following are C source code examples of using the unlock bypass entry, program, and exit
functions. Refer to the Spansion Low Level Driver User’s Guide (available soon on www.amd.com
and www.fujitsu.com) for general information on Spansion Flash memory software development
guidelines.
Table 10.19 Software Functions and Sample Code
Cycle
Description
Operation
Byte Address
Word Address
Data
1
Unlock
Write
Base + AAAh
Base + 555h
00AAh
2
Unlock
Write
Base + 554h
Base + 2AAh
0055h
3
Entry Command
Write
Base + AAAh
Base + 555h
0020h


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