M28W640HCT datasheet(66/72 Pages) NUMONYX

tên linh kiện	M28W640HCT

Giải thích chi tiết về linh kiện	64 Mbit (4 Mb x 16, boot block) 3 V supply Flash memory

PDF	72 Pages

Scroll/Zoom	100%

nhà sản xuất	NUMONYX [Numonyx B.V]

Trang chủ	http://www.numonyx.com

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66 / 72 page

Flowcharts and pseudocodes

M28W640HCT, M28W640HCB

66/72

Figure 22.

Protection Register Program flowchart and pseudocode

Status check of b1 (protected block), b3 (VPP invalid) and b4 (program error) can be made after each program operation or

after a sequence.

If an error is found, the Status Register must be cleared before further Program/Erase controller operations.

Write C0h

AI04381

Start

Write Address

& Data

Read Status

YES

b7 = 1

YES

b3 = 0

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

protection_register_program_command (addressToProgram, dataToProgram) {:

writeToFlash (any_address, 0xC0) ;

do {

status_register=readFlash (any_address) ;

/* E or G must be toggled*/

} while (status_register.b7== 0) ;

if (status_register.b3==1) /*VPP invalid error */

error_handler ( ) ;

YES

End

YES

b1 = 0

Program to Protected

Block Error (1, 2)

writeToFlash (addressToProgram, dataToProgram) ;

/*Memory enters read status state after

the Program Command*/

if (status_register.b4==1) /*program error */

error_handler ( ) ;

if (status_register.b1==1) /*program to protect block error */

error_handler ( ) ;

}

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