S25FS256S datasheet(70/154 Pages) SPANSION

70 / 154 page

S25FS-S Family

S25FS-S_00_04 November 6, 2013

Data

Sheet

(Pre limin ar y)

8.6.5.2

Configuration Register 3 Volatile (CR3V)

Related Commands: Read Any Register (RDAR 65h), Write Any Register (WRAR 71h).

Blank Check Volatile CR3V[5]: This bit controls the blank check during erase feature. When this feature is

enabled an erase command first evaluates the Erase Status of the sector. If the sector is found to have not

completed its last erase successfully, the sector is unconditionally erased. If the last erase was successful,

the sector is read to determine if the sector is still erased (blank). The erase operation is started immediately

after finding any programmed zero. If the sector is already blank (no programmed zero bit found) the

remainder of the erase operation is skipped. This can dramatically reduce erase time when sectors being

erased do not need the erase operation. When enabled the blank check feature is used within the parameter

erase, Sector Erase, and Bulk Erase commands. When blank check is disabled an Erase command

unconditionally starts the Erase operation.

02h Volatile CR3V[4]: This bit controls the Page Programming Buffer address wrap point. Legacy SPI

devices generally have used a 256-byte Page Programming Buffer and defined that if data is loaded into the

buffer beyond the 255-byte location, the address at which additional bytes are loaded would be wrapped to

address zero of the buffer. The S25FS-S family provides a 512-byte Page Programming Buffer that can

increase programming performance. For legacy software compatibility, this configuration bit provides the

option to continue the wrapping behavior at the 256-byte boundary or to enable full use of the available

512-byte buffer by not wrapping the load address at the 256-byte boundary.

20h Volatile CR3V[3]: This bit controls the availability of 4-kB parameter sectors in the main flash array

address map. The parameter sectors can overlay the highest or lowest 32-kB address range of the device or

they can be removed from the address map so that all sectors are uniform size. This bit shall not be written to

a value different than the value of CR3NV[3]. The value of CR3V[3] may only be changed by writing

CR3NV[3].

30h Volatile CR3V[2]: This bit controls how the 30h instruction code is used. The instruction may be used as

a Clear Status command or as an alternate Program / Erase Resume command. This allows software

compatibility with either Spansion legacy SPI devices or alternate vendor devices.

D8h Volatile CR3V[1]: This bit controls the area erased by the D8h or DCh instructions. The instruction can

be used to erase 64-kB physical sectors or 256-kB size and aligned blocks. The option to erase 256-kB

blocks in the lower density family members allows for consistent software behavior across all densities that

can ease migration between different densities.

F0h Volatile CR3V[0]: This bit controls the availability of the Spansion legacy FL-S family software reset

instruction. The S25FS-S family supports the industry common 66h + 99h instruction sequence for software

reset. This configuration bit allows the option to continue use of the legacy F0h single command for software

reset.

Table 8.23 Configuration Register 3 Volatile (CR3V)

Bits

Field Name

Function

Type

Default

State

Description

RFU

Reserved

Volatile

CR3NV

Reserved for Future Use.

RFU

Reserved

Reserved for Future Use.

BC_V

Blank Check

1 = Blank Check during erase enabled.

0 = Blank Check disabled.

02h_V

Page Buffer Wrap

1 = Wrap at 512 bytes.

0 = Wrap at 256 bytes.

20h_V

4-kB Erase

Volatile,

Read Only

1 = 4-kB Erase disabled (Uniform Sector Architecture).

0 = 4-kB Erase enabled (Hybrid Sector Architecture).

30h_V

Clear Status /

Resume Select

Volatile

1 = 30h is Erase or Program Resume command.

0 = 30h is Clear Status command.

D8h_V

Block Erase Size

1 = 256-kB Erase.

0 = 64-kB Erase.

F0h_V

Legacy Software

Reset Enable

1 = F0h software reset is enabled.

0 = F0h software reset is disabled (ignored).

S25FS256S Datasheet(PDF) 70 Page - SPANSION

S25FS256S Datasheet(HTML) 70 Page - SPANSION

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL