Struct JedecParams

pub struct JedecParams {

    pub block_erase_size: BlockEraseSize,
    pub write_granularity: WriteGranularity,
    pub write_en_required: bool,
    pub write_en_opcode: u8,
    pub erase_opcode_4kib: u8,
    pub support_fast_read_112: bool,
    pub address_modes: SupportedAddressModes,
    pub support_double_rate_clocking: bool,
    pub support_fast_read_122: bool,
    pub support_fast_read_144: bool,
    pub support_fast_read_114: bool,
    pub support_fast_read_222: bool,
    pub support_fast_read_444: bool,
    pub density: u32,
    pub param_112: FastReadParam,
    pub param_122: FastReadParam,
    pub param_114: FastReadParam,
    pub param_144: FastReadParam,
    pub param_222: FastReadParam,
    pub param_444: FastReadParam,
    pub erase: [SectorErase; 4],
    pub rev_b: Option<JedecParamsRevB>,
    pub rev_d: Option<JedecParamsRevD>,
    pub rev_f: Option<JedecParamsRevF>,
}

The JEDEC parameter table is documented in JESD216 “Serial Flash Discoverable Parameters”. This structure represents the parameter table after decoding it from the packed bitfield representation documented by JEDEC.

I have access to the following specs:

• JESD216 dated April 2011 (Flash parameters version 1.0).

• JESD216B dated May 2014 (Flash parameters version 1.6).

• JESD216D dated August 2019 (Flash parameters version 1.7, unchanged since rev C).

• JESD216F dated February 2022 (Flash parameters version 1.7, unchanged since rev D).

• Version 1.0 defines a table of 9 “dwords”. I’m considering this to be the minimum required parameter table.

• Rev B, version 1.6 extends the table to 16 “dwords”, including information about erase timing, powerdown and alternate mode requirements.

• Rev D, version 1.7 extends the table to 20 “dwords”, including information about eight-lane SPI modes.

• Rev F, version 1.7 extends the table to 23 “dwords”, including information about dual data rate operations.

Fields

block_erase_size: BlockEraseSize

Erase granularity.

write_granularity: WriteGranularity

Write granularity / buffer size.

write_en_required: bool

WREN instruction required for writing to volatile status register.

write_en_opcode: u8

Write enable opocde (this is a single bit in the jedec table; expanded to the actual opcode here).

erase_opcode_4kib: u8

Erase opcode for 4KiB sector erase.

support_fast_read_112: bool

Support Fast Read 1-1-2.

address_modes: SupportedAddressModes

The address modes supported by the device.

support_double_rate_clocking: bool

Device supports double rate clocking.

support_fast_read_122: bool

Other styles of Fast Read. The numerical designator refers to the instruction transfer mode, the address transfer mode and data transfer mode. ie: 1-2-2 means single bit mode for the opcode, dual mode for the address and dual mode for the data phase.

support_fast_read_144: bool

support_fast_read_114: bool

support_fast_read_222: bool

support_fast_read_444: bool

density: u32

The density of the part. In the jedec table, this is expressed in bits, but it is converted to bytes here.

param_112: FastReadParam

Parameters for the various supported FastRead modes.

param_122: FastReadParam

param_114: FastReadParam

param_144: FastReadParam

param_222: FastReadParam

param_444: FastReadParam

erase: [SectorErase; 4]

Erase sector sizes. It is common for devices to support a 4KiB erase size, a 32KiB erase size and a 64KiB erase size.

rev_b: Option<JedecParamsRevB>

rev_d: Option<JedecParamsRevD>

rev_f: Option<JedecParamsRevF>

Trait Implementations

impl Annotate for &JedecParams

fn format(&self, variant: Option<&str>, field: &MemberId<'_>) -> Option<Format>

fn comment(&self, variant: Option<&str>, field: &MemberId<'_>) -> Option<String>

fn as_annotate(&self) -> Option<&dyn Annotate>

fn thunk_serialize( &self, serializer: &mut AnnotatedSerializer<'_>, ) -> Result<Document, Error>

impl Annotate for JedecParams

fn format(&self, _variant: Option<&str>, field: &MemberId<'_>) -> Option<Format>

fn comment( &self, _variant: Option<&str>, field: &MemberId<'_>, ) -> Option<String>

fn as_annotate(&self) -> Option<&dyn Annotate>

fn thunk_serialize( &self, serializer: &mut AnnotatedSerializer<'_>, ) -> Result<Document, Error>

impl Debug for JedecParams

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for JedecParams

fn default() -> JedecParams

Returns the “default value” for a type.

impl Serialize for JedecParams

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<&[u8]> for JedecParams

type Error = Error

The type returned in the event of a conversion error.

fn try_from(buf: &[u8]) -> Result<Self, Self::Error>

Performs the conversion.