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S71WS512NC0BAWE32 데이터시트(PDF) 40 Page - SPANSION |
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40 / 188 page  38 S71WS-Nx0 Based MCPs S71WS-N_01_A4 September 15, 2005 Ad van c e Inf o rmation Notes: 1. Base = Base Address. 2. Last = Last cycle of write buffer program operation; depending on number of words written, the total number of cycles may be from 6 to 37. 3. For maximum efficiency, it is recommended that the write buffer be loaded with the highest number of words (N words) possible. The following is a C source code example of using the write buffer program function. Refer to the Spansion Low Level Driver User’s Guide (available on www.amd.com and www.fujitsu.com) for general information on Spansion Flash memory software development guidelines. /* Example: Write Buffer Programming Command */ /* NOTES: Write buffer programming limited to 16 words. */ /* All addresses to be written to the flash in */ /* one operation must be within the same flash */ /* page. A flash page begins at addresses */ /* evenly divisible by 0x20. */ UINT16 *src = source_of_data; /* address of source data */ UINT16 *dst = destination_of_data; /* flash destination address */ UINT16 wc = words_to_program -1; /* word count (minus 1) */ *( (UINT16 *)base_addr + 0x555 ) = 0x00AA; /* write unlock cycle 1 */ *( (UINT16 *)base_addr + 0x2AA ) = 0x0055; /* write unlock cycle 2 */ *( (UINT16 *)sector_address ) = 0x0025; /* write write buffer load command */ *( (UINT16 *)sector_address ) = wc; /* write word count (minus 1) */ loop: *dst = *src; /* ALL dst MUST BE SAME PAGE */ /* write source data to destination */ dst++; /* increment destination pointer */ src++; /* increment source pointer */ if (wc == 0) goto confirm /* done when word count equals zero */ wc--; /* decrement word count */ goto loop; /* do it again */ confirm: *( (UINT16 *)sector_address ) = 0x0029; /* write confirm command */ /* poll for completion */ /* Example: Write Buffer Abort Reset */ *( (UINT16 *)addr + 0x555 ) = 0x00AA; /* write unlock cycle 1 */ *( (UINT16 *)addr + 0x2AA ) = 0x0055; /* write unlock cycle 2 */ *( (UINT16 *)addr + 0x555 ) = 0x00F0; /* write buffer abort reset */ Table 10.14 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 Write Buffer Load Command Write Program Address 0025h 4 Write Word Count Write Program Address Word Count (N–1)h Number of words (N) loaded into the write buffer can be from 1 to 32 words. 5 to 36 Load Buffer Word N Write Program Address, Word N Word N Last Write Buffer to Flash Write Sector Address 0029h |
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