Memory Component Skill

Guidance for working with memory components in the lib-electronic-components library.

Supported Manufacturers & Patterns

Manufacturer	Handler	MPN Patterns	Example
Winbond	`WinbondHandler`	`W25Q#`, `W25X#`, `W##`	`W25Q128JVSIQ`
Micron	`MicronHandler`	`MT#`, `N25Q#`, `M25P#`	`MT25QL128ABA`
ISSI	`ISSIHandler`	`IS#`, `IS25LP#`, `IS25WP#`	`IS25LP128F`
Microchip	`MicrochipHandler`	`AT24C#`, `AT25#`, `SST26#`	`AT24C256`
Macronix	Various	`MX25#`	`MX25L12835F`
Cypress/Infineon	`CypressHandler`	`S25FL#`, `FM24#`	`S25FL128S`

ComponentTypes

java

// Base types
ComponentType.MEMORY
ComponentType.MEMORY_FLASH
ComponentType.MEMORY_EEPROM

// Manufacturer-specific types
ComponentType.MEMORY_FLASH_WINBOND
ComponentType.MEMORY_EEPROM_WINBOND
ComponentType.MEMORY_MICRON
ComponentType.MEMORY_ISSI
ComponentType.MEMORY_MICROCHIP
ComponentType.MEMORY_ATMEL
ComponentType.MEMORY_INFINEON
ComponentType.MEMORY_NXP
ComponentType.MEMORY_ST
ComponentType.MEMORY_RENESAS
ComponentType.MEMORY_MAXIM

Flash Memory

Winbond W25Q Series (SPI NOR Flash)

code

W25Q 128 JV SIQ
│    │   │  │
│    │   │  └── Package (SIQ=SOIC-8 150mil)
│    │   └───── Voltage/Grade (JV=3.3V, FV=1.8V)
│    └───────── Density (128=128Mbit)
└────────────── Series

Common Densities

Code	Size
32	32Mbit (4MB)
64	64Mbit (8MB)
128	128Mbit (16MB)
256	256Mbit (32MB)
512	512Mbit (64MB)

Interfaces

Type	Description	Speed
SPI	Serial Peripheral Interface	50-133MHz
QSPI	Quad SPI	104-133MHz
DSPI	Dual SPI	80-104MHz
Parallel	Parallel interface	Various

EEPROM

Microchip AT24C Series (I2C EEPROM)

code

AT24C 256 C
│     │   │
│     │   └── Temperature range (C=Commercial)
│     └────── Density (256=256Kbit)
└──────────── Series (I2C EEPROM)

Common EEPROM Series

Series	Interface	Organization
AT24C	I2C	x8
AT25	SPI	x8
93C	Microwire	x8/x16

SRAM

Patterns

Manufacturer	Pattern	Example
ISSI	`IS61#`, `IS62#`	`IS62WV12816BLL`
Cypress	`CY62#`, `CY7C#`	`CY62256NLL`

Adding New Memory Patterns

•In the manufacturer handler's initializePatterns():

java

registry.addPattern(ComponentType.MEMORY, "^NEWMEM[0-9].*");
registry.addPattern(ComponentType.MEMORY_FLASH, "^NEWMEM[0-9].*");
registry.addPattern(ComponentType.MEMORY_MANUFACTURER, "^NEWMEM[0-9].*");

•Add to getSupportedTypes():

java

types.add(ComponentType.MEMORY);
types.add(ComponentType.MEMORY_FLASH);
types.add(ComponentType.MEMORY_MANUFACTURER);

Similarity Calculation

MemorySimilarityCalculator compares:

•Memory type (Flash, EEPROM, SRAM)
•Density/capacity
•Interface (SPI, I2C, parallel)
•Voltage range
•Speed grade
•Package

Package Codes

Code	Package
SIQ	SOIC-8 150mil
SIG	SOIC-8 208mil
DIQ	DFN-8
CIQ	WSON-8
BIQ	BGA
PIQ	PDIP-8

Memory Type Detection

The library can detect memory types from MPN patterns:

java

// Detect flash memory
ComponentType type = ComponentType.fromMPN("W25Q128JVSIQ");
// Returns MEMORY_FLASH_WINBOND

// Detect EEPROM
ComponentType type = ComponentType.fromMPN("AT24C256");
// Returns MEMORY_EEPROM or MEMORY_ATMEL

Learnings & Quirks