-- AttilioTarantola - 26 Apr 2009

The OEPB flash programming over ETRAX.

1)ETRAX takes OEPB configuration file.

2)ETRAX does block write with increasing addresses and writes 32 bits dataword in the following addresses:

address nr: 0-63 data (64 addresses x 32bits = 2048 bits =1 flash page)

address nr: 64: flash page number

address nr: 65: flash programming status

address nr: 64: flash control register

3)ETRAX sends 1 page->MDC addon->OEPB

4)OEPB loads page by page in a RAM and then to FLASH

5)OEPB writes control register. The process is repeated for all pages.

Main Commands for Macronix (MX25L1605D) for OEPB

Command Name	Command	Send Data at Command	Receive data at Command	Comments
WREN	x"06"	-	-	enable write
WRDI	x"04"	-	-	reset write enable
RDSR	x"05"	-	2 byte	readout status register
CP	x"AD"	3 byte(ADD) + 2 byte(DUMMY DATA) + XX DATA	-	send all data at once. Add. auto increase
CE	x"60"	-	-	erase whole chip
PP	x"PP"	3 byte(ADD) + 1 byte (DATA)	-	program selected page
REMS	x"90"	2 DUMMY byte	2 byte	output manufacturer ID and device ID

Possible command sequence for OEPB

Sequence Number	Command	Comment
0	RDSR	if Block Protect = 0 then CE can be executed
1	CE	erase whole chip
2	RDSR	be sure CE has been executed
3	WREN	enable write
4	CP	continuously write data
5	WRDI	reset write enable
6	RDSR	be sure CP mode is ended