S25FS256S datasheet(16/154 Pages) SPANSION

16 / 154 page

S25FS-S Family

S25FS-S_00_04 November 6, 2013

Data

Sheet

(Pre limin ar y)

2.3

Glossary

BCD

(Binary Coded Decimal)

A value in which each 4-bit nibble represents a decimal numeral.

Command

All information transferred between the host system and memory during one period while

CS# is low. This includes the instruction (sometimes called an operation code or opcode)

and any required address, mode bits, latency cycles, or data.

DDP

(Dual Die Package)

Two die stacked within the same package to increase the memory capacity of a single

package. Often also referred to as a Multi-Chip Package (MCP).

DDR

(Double Data Rate)

When input and output are latched on every edge of SCK.

Flash

The name for a type of Electrical Erase Programmable Read Only Memory (EEPROM)

that erases large blocks of memory bits in parallel, making the erase operation much

faster than early EEPROM.

High

A signal voltage level

≥ V

IH or a logic level representing a binary one (1).

Instruction

The 8-bit code indicating the function to be performed by a command (sometimes called

an operation code or opcode). The instruction is always the first 8 bits transferred from

host system to the memory in any command.

Low

A signal voltage level

≤ VIL or a logic level representing a binary zero (0).

LSB

(Least Significant Bit)

Generally the right most bit, with the lowest order of magnitude value, within a group of

bits of a register or data value.

MSB

(Most Significant Bit)

Generally the left most bit, with the highest order of magnitude value, within a group of bits

of a register or data value.

N/A

(Not Applicable)

A value is not relevant to situation described.

Non-Volatile

No power is needed to maintain data stored in the memory.

OPN

Ordering Part Number. The alphanumeric string specifying the memory device type,

density, package, factory non-volatile configuration, etc. used to select the desired device.

Page

512-byte or 256-byte aligned and length group of data. The size assigned for a page

depends on the Ordering Part Number.

PCB

Printed Circuit Board.

Are in the format: Register_name[bit_number] or Register_name[bit_range_MSB:

bit_range_LSB]

SDR

(Single Data Rate)

When input is latched on the rising edge and output on the falling edge of SCK.

Sector

Erase unit size; depending on device model and sector location this may be 4 kbytes,

64 kbytes or 256 kbytes.

Write

An operation that changes data within volatile or non-volatile registers bits or non-volatile

flash memory. When changing non-volatile data, an erase and reprogramming of any

unchanged non-volatile data is done, as part of the operation, such that the non-volatile

data is modified by the write operation, in the same way that volatile data is modified – as

a single operation. The non-volatile data appears to the host system to be updated by the

single write command, without the need for separate commands for erase and reprogram

of adjacent, but unaffected data.

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