Protocol decoder:Spiflash

mx25lxx05d

Name	Macronix MX25Lxx05D
Description	SPI-attached serial EEPROM
Status	supported
License	GPLv2+
Source code	decoders/mx25lxx05d
Input	spi, logic
Output	mx25lxx05d
Probes	—
Optional probes	HOLD#, WP#/ACC
Options	—

The mx25lxx05d protocol decoder supports the Macronix MX25L1605D / MX25L3205D / MX25L6405D SPI (NOR) flash chip protocol.

Hardware

Chip pinout

The Macronix MX25Lxx05D chips have the following pinout:

CS#	1-	O	-8	VCC
SO	2-		-7	HOLD#
WP#	3-		-6	SCLK
GND	4-		-5	SI

Macronix MX25L1605D in openbiosprog-spi

The spi/mx25l1605d directory in sigrok-dumps contains a set of example captures of a Macronix MX25L1605D (MX25L1605DPI-12G) SPI flash chip (16Mbit == 2Mbyte; NOR flash) that is probed, being written to, read, or erased.

The logic analyzer used was a ChronoVu LA8 (at 25MHz). It is probing the SPI chip in the openbiosprog-spi Open Hardware USB-based SPI chip programmer. The host software used is flashrom.

Probe setup:

Probe	MX25L1605D pin
0 (green)	CS#
1 (orange)	SO/SIO1 (a.k.a MISO)
2 (white)	SCLK
3 (red)	SI/SIO0 (a.k.a MOSI)
4 (gray)	WP#/ACC
5 (brown)	HOLD#

Photos:

• 

  openbiosprog-spi with chip

• 

  Macronix MX25L1605D

• 

  ChronoVu LA8

• 

  Chip, probed

Protocol

The chip uses the standard SPI protocol and pins (MISO, MOSI, SCLK, CS#), with the additional (optional) HOLD# and WP#/ACC pins.

The host can send a large number of commands to the SPI chip (such as WREN, RDID, READ, SE, CE, PP, and many more). The commands have various length, and usually consist of one command ID byte, optional address bytes, one or more data/payload bytes, and so on (depending on the command).

TODO: Detailed protocol description.

Resources

• Macronix MX25L1605D (datasheet)