Embedded Flash memory

Flash main features

• Up to 128Kbytes of Flash memory
• Memory organization:
  • Main Flash memory block:
    Up to 128Kbytes
  • Information block:
    Up to 512bytes
    Information block is read only
  • Data block:
    Up to 512bytes
• Flash memory interface features:
  • Read interface with prefetch buffer( 1 x 32-bit words )
  • Flash Program / Erase operation
  • Read / Write protection

Flash memory functional description

Flash memory organization

The Flash memory is organized of 32-bit wide memory cells that can be used for storing both code and data constants. The memory organization is based on a main Flash memory block containing 512 sectors of 256byte or 32 blocks of 4Kbyte. The block and sector provides read/write protection.

Flash area	Flash memory address	Size (bytes)	Name	Description
M a i n F l a s h m e m o r y	0x0000 0000 ~ 0x0000 00FF	256	Sector 0	Block 0
	0x0000 0100 ~ 0x0000 01FF	256	Sector 1
	0x0000 0200 ~ 0x0000 02FF	256	Sector 2
	. . .	. . .	. . .
	0x0000 0E00 ~ 0x0000 0EFF	256	Sector 14
	0x0000 0F00 ~ 0x0000 0FFF	256	Sector 15
	. . .	. . .	. . .	. . .
	0x0000 7000 ~ 0x0000 70FF	256	Sector128	Block 7
	0x0000 7100 ~ 0x0000 71FF	256	Sector129
	. . .	. . .	. . .
	0x0000 7E00 ~ 0x0000 7EFF	256	Sector142
	0x0000 7F00 ~ 0x0000 7FFF	256	Sector143
	. . .	. . .	. . .	. . .
	0x0001 F000 ~ 0x0001 F0FF	256	Sector496	Block 31
	0x0001 F100 ~ 0x0001 F1FF	256	Sector497
	. . .	. . .	. . .
	0x0001 FE00 ~ 0x0001 FEFF	256	Sector510
	0x0001 FF00 ~ 0x0001 FFFF	256	Sector511
Information block	0x0003 FC00 ~ 0x0003 FCFF	256		Lock info
	0x0003 FD00 ~ 0x0003 FDFF	Reserved
Data block	0x0003 FE00 ~ 0x0003 FEFF	256		Data0
	0x0003 FF00 ~ 0x0003 FFFF	256		Data1

The W7500 embedded Flash memory can be programmed using in-application programming. IAP allows the user to re-program the Flash memory while the application is running. The program and erase operations can be performed over the whole product voltage range.

In W7500x_Library_Examples, there is the IAP Example Project and the below function is supported to use IAP.

void DO_IAP( uint32_t id, uint32_t dst_addr, uint8_t* src_addr, uint32_t size);

This function requests those parameters, id, dst_addr, src_addr and size. 'id' is already defined in 'main.c'. 'dst_addr' is the flash memory address in the upper table. 'src_addr' is the buffer pointer user want to program. 'size' is the flash size user chooses. Please refer flash address and size mentioned in the upper table.

// IAP 'id' paremeter define
#define IAP_ENTRY           0x1FFF1001     // Because Thum code
#define IAP_ERAS            0x010
#define IAP_ERAS_DAT0       (IAP_ERAS + 0) // Erase Data 0 block
#define IAP_ERAS_DAT1       (IAP_ERAS + 1) // Erase Data 1 block
#define IAP_ERAS_SECT       (IAP_ERAS + 2) // Erase a Sector in Main Flash Memory 
#define IAP_ERAS_BLCK       (IAP_ERAS + 3) // Erase a Block in Main Flash Memory 
#define IAP_ERAS_CHIP       (IAP_ERAS + 4) // Erase all code
#define IAP_ERAS_MASS       (IAP_ERAS + 5) // Erase all code & data
#define IAP_PROG            0x022

This is how to Erase and Program flash memory. Especially, with IAP_ERAS_DAT0 and IAP_ERAS_DAT1, there is no need to put other parameters (there are default values).

// Step 1 DATA0 Erase, Read, Write Test
DO_IAP(IAP_ERAS_DAT0,0,0,0);
DO_IAP(IAP_PROG,DAT0_START_ADDR,buffer,SECT_SIZE);

Operating program can be deleted when user use 'IAP_ERAS_CHIP' or 'IAP_ERAS_MASS'.

// Using IAP_ERAS_CHIP or IAP_ERAS_MASS
DO_IAP(IAP_ERAS_CHIP,0,0,0);
DO_IAP(IAP_ERAS_MASS,0,0,0);