S75WS256NDFBAWMB datasheet(123/216 Pages) SPANSION

123 / 216 page

February 17, 2005 S75WS-N-00_00_A0

S75WS256Nxx Based MCPs

121

Data

Sheet

21 Command Definitions

Legend:

X = Don’t care

RA = Address of the memory location to be read.

RD = Data read from location RA during read operation.

PA = Address of the memory location to be programmed. Addresses latch on the rising edge of the AVD# pulse or active edge of CLK which ever

comes first.

PD = Data to be programmed at location PA. Data latches on the rising edge of WE# or CE# pulse, whichever happens first.

SA = Address of the sector to be verified (in autoselect mode) or erased. Address bits A24–A14 for the RS512N uniquely select any sector.

CR = Configuration Register data bits D15–D0.

WBL = Write Buffer Location. Address must be within the same write buffer page as PA.

WC = Word Count. Number of write buffer locations to load minus 1.

Notes:

1. See Table 18.1 for description of bus operations.

2. All values are in hexadecimal.

3. Except for the following, all bus cycles are write cycle: read cycle, fourth through sixth cycles of the Autoselect commands, fourth cycle of

the configuration register verify command, and any cycle reading at RD(0) and RD(1).

4. Data bits DQ15–DQ8 are don’t care in command sequences, except for RD, PD, and WD.

5. Unless otherwise noted, address bits Amax–A12 are don’t cares.

6. Writing incorrect address and data values or writing them in the improper sequence may place the device in an unknown state. The system

must write the reset command to return the device to reading array data.

7. No unlock or command cycles required when device is reading array data.

8. The Reset command is required to return to reading array data (or to the erase-suspend-read mode if previously in Erase Suspend) when

device is in the autoselect mode, or if DQ5 goes high (while the device is providing status information) or performing sector lock/unlock.

9. The fourth cycle of the autoselect command sequence is a read cycle. See the Autoselect Command Sequence section.

10. 512 Mb: 0Eh = 29h and 0Fh = 01h.

11. See the Autoselect Command Sequence section.

12. The Unlock Bypass command sequence is required prior to this command sequence.

13. The Unlock Bypass Reset command is required to return to reading array data when the device is in the unlock bypass mode.

14. The system may read and program in non-erasing sectors, or enter the autoselect mode, when in the Erase Suspend mode. The Erase

Suspend command is valid only during a sector erase operation.

15. The Erase Resume command is valid only during the Erase Suspend mode

16. See the Set Configuration Register Command Sequence section.

17. See the Read Configuration Register Command Sequence section which further provides information on Reset Command to Configure the

Configuration Register.

18. The total number of cycles in the command sequence is determined by the number of words written to the write buffer. The maximum

number of cycles in the command sequence is 37.

19. ACC must be at V

HH during the entire operation of this command

20. Command sequence resets device for next command after write-to-buffer operation.

21. Entry commands are needed to enter a specific mode to enable instructions only available within that mode.

22. Write Buffer Programming can be initiated after Unlock Bypass Entry.

Command Sequence

(Note 1)

Bus Cycles (Notes 1–6)

First

Second

Third

Fourth

Fifth

Sixth

Addr

Data

Addr Data Addr Data

Addr

Data

Addr Data Addr Data

Asynchronous Read (7)

Reset (8)

XXX

Autoselect

(9)

Manufacturer ID

555

2AA

555

X00

0001

Device ID (10)

555

2AA

555

X01

(11)X0E

(10)X0F(10)

Indicator Bits

555

2AA

555

X03

(11)

Program

555

2AA

555

Data

Write to Buffer (18)

555

2AA

WBL

Program Buffer to Flash

Write to Buffer Abort Reset (22)

555

2AA

555

Chip Erase

555

2AA

555

2AA

555

Sector Erase

555

2AA

555

2AA

Erase Suspend (15)

XXX

Erase Resume (15)

XXX

Set Configuration Register (16)

555

2AA

555

X00 or X01

Read Configuration Register (17)

555

2AA

555

X00 or X01

Unlock

Bypass

Mode

Unlock Bypass Entry (21)

555

2AA

555

Unlock Bypass Program (12, 13)2

Unlock Bypass Reset

XXX

Volatile Sector Protection Command Set Definitions

DYB

Volatile Sector Protection

Command Set Entry

555

2AA

555

DYB Set

DYB Clear

DYB Status Read

RD(0)

Volatile Sector Protection

Command Set Exit

2XX

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