HM25Q40C datasheet(14/62 Pages) HMSEMI

14 / 62 page

Preliminary Datasheet

5.2.3 SFDP Header Field Definitions

Table 5.3 SFDP Header

SFDP Byte

Address

SFDP Dword

Name

Data

Description

00h

SFDP Header

1st DWORD

53h

This is the entry point for Read SFDP (5Ah) command i.e. location zero within

SFDP space

ASCII “S”

01h

46h

ASCII “F”

02h

44h

ASCII “D”

03h

50h

ASCII “P”

04h

SFDP Header

2nd DWORD

06h

SFDP Minor Revision (06h = JEDEC JESD216 Revision B)

– This revision is backward compatible with all prior minor revisions. Minor

revisions are changes that define previously reserved fields, add fields to the

end, or that clarify definitions of existing fields. Increments of the minor revision

value indicate that previously reserved parameter fields may have been

assigned a new definition or entire Dwords may have been added to the

parameter table. However, the definition of previously existing fields is

unchanged and therefore remains backward compatible with earlier SFDP

parameter table revisions. Software can safely ignore increments of the minor

revision number, as long as only those parameters the software was designed

to support are used i.e. Previously reserved fields and additional Dwords must

be masked or ignored. Do not do a simple compare on the minor revision

number, looking only for a match with the revision number that the software is

designed to handle. There is no problem with using a higher number minor

revision.

05h

01h

SFDP Major Revision

– This is the original major revision. This major revision is compatible with all

SFDP reading and parsing software.

06h

00h

Number of Parameter Headers (zero based, 00h = 1 parameters

07h

FFh

Unused

08h

Parameter Header

0 1st DWORD

00h

Parameter ID LSB (00h = JEDEC SFDP Basic SPI Flash Parameter)

09h

06h

Parameter Minor Revision (00h = JESD216)

–This older revision parameter header is provided for any legacy SFDP reading

and parsing software that requires seeing a minor revision 6 parameter header.

SFDP software designed to handle later minor revisions should continue

reading parameter headers looking for a higher numbered minor revision that

contains additional parameters for that software revision.

0Ah

01h

Parameter Major Revision (01h = The original major revision - all SFDP

software is compatible with this major revision.

0Bh

10h

Parameter Table Length (in double words = Dwords = 4-byte units) 10h = 16

Dwords

0Ch

Parameter Header

0 2nd DWORD

30h

Parameter Table Pointer Byte 0 (Dword = 4-byte aligned) JEDEC Basic SPI

Flash parameter byte offset = 30h

0Dh

00h

Parameter Table Pointer Byte 1

0Eh

00h

Parameter Table Pointer Byte 2

0Fh

FFh

Parameter ID MSB (FFh = JEDEC defined legacy Parameter ID)

HM25Q40A

HM25Q40C Scheda tecnica(PDF) 14 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

HM25Q40C Scheda tecnica(HTML) 14 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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

Scheda tecnica Scarica

Link URL