SST38VF6402B datasheet(13/56 Pages) MICROCHIP

13 / 56 page

 2013 Microchip Technology Inc.

Preliminary

DS20005002D-page 13

SST38VF6401B / SST38VF6402B / SST38VF6403B / SST38VF6404B

Program and Erase operations are prevented on the

Boot Block when WP# is low. If WP# is left floating, it is

internally held high via a pull-up resistor. When WP# is

high, the Boot Block is unprotected, which allows Pro-

gram and Erase operations on that area.

4.9.3

HARDWARE RESET (RST#)

The RST# pin provides a hardware method of resetting

the device to read array data. When the RST# pin is

held low for at least TRP, any in-progress operation will

terminate and return to Read mode. When no internal

Program/Erase operation is in progress, a minimum

period of TRHR is required after RST# is driven high

before a valid Read can take place. See Figure 6-15 for

more information.

The interrupted Erase or Program operation must be

re-initiated after the device resumes normal operation

mode to ensure data integrity.

4.9.4

SOFTWARE DATA PROTECTION (SDP)

The

SST38VF6401B/6402B/6403B/6404B

devices

implement the JEDEC approved Software Data Protec-

tion (SDP) scheme for all data alteration operations,

such as Program and Erase. These devices are

shipped with the Software Data Protection permanently

enabled. See Table 5-2 for the specific software com-

mand codes.

All Program operations require the inclusion of the

three-byte sequence. The three-byte load sequence is

used to initiate the Program operation, providing opti-

mal protection from inadvertent Write operations. SDP

for Erase operations is similar to Program, but a six-

byte load sequence is required for Erase operations.

During SDP command sequence, invalid commands

will abort the device to read mode within TRC. The con-

tents of DQ15-DQ8 can be VIL or VIH, but no other

value, during any SDP command sequence.

The SST38VF6401B/6402B/6403B/6404B devices

provide Bypass Mode, which allows for reduced Pro-

gram and Erase command sequence lengths. In this

mode, the SDP portion of Program and Erase com-

mand sequences are omitted. See “Bypass Mode” on

page 14 for further details.

4.10

Common Flash Memory Interface

(CFI)

The SST38VF6401B/6402B/6403B/6404B contain Com-

mon Flash Memory Interface (CFI) information that

describes the characteristics of the device. In order to

enter the CFI Query mode, the system can write a one-

byte sequence using a standard CFI Query Entry com-

mand. Once the device enters the CFI Query mode, the

system can read CFI data at the addresses given in

Tables 5-4 through 5-7.

The system must write the CFI Exit command to return

to Read mode. Note that the CFI Exit command is

ignored during an internal Program or Erase operation.

See Table 5-2 for software command codes, Figures 6-

12 and 6-14 for timing waveform, and Figures 6-22 and

6-23 for flowcharts.

4.11

Product Identification

The Product Identification mode identifies the devices

the

SST38VF6401B,

SST38VF6402B,

SST38VF6403B, or SST38VF6404B, and the manu-

facturer as Microchip. See Table 4-3 for specific

address and data information. Product Identification

mode is accessed through software operations. The

software Product Identification operations identify the

part, and can be useful when using multiple manufac-

turers in the same socket. For details, see Table 5-2 for

software operation, Figure 6-11 for the software ID

Entry and Read timing diagram, and Figure 6-22 for the

software ID Entry command sequence flowchart.

While in Product Identification mode, the Read Block

Protection Status command determines if a block is

protected. The status returned indicates if the block has

been protected, but does not differentiate between Vol-

atile Block Protection and Non-Volatile Block Protec-

tion. See Table 5-2 for further details.

The Read-Irreversible Block-Lock Status command

indicates if the Irreversible Block Command has been

issued. If DQ0 = 0, then the Irreversible Lock command

has been previously issued.

In order to return to the standard Read mode, the soft-

ware Product Identification mode must be exited. The

exit is accomplished by issuing the software ID Exit

command sequence, which returns the device to the

Read mode. See Table 5-2 for software command

codes, Figure 6-14 for timing waveform, and Figures 6-

22 and 6-23 for flowcharts.

4.12

Security ID

The SST38VF6401B/6402B/6403B/6404B devices offer

a Security ID feature. The Secure ID space is divided

into two segments — one factory programmed 128 bit

segment and one user programmable 248 word seg-

ment. See Table 4-4 for address information. The first

segment is programmed and locked at Microchip and

TABLE 4-3:

PRODUCT IDENTIFICATION

Add Data

Manufacturer’s ID 00H

BFH

Device ID

SST38VF6401B

01H 227EH 0EH 220CH 0FH 2200H

SST38VF6402B 01H 227EH 0EH 220CH 0FH 2201H

SST38VF6403B 01H 227EH 0EH 2210H 0FH 2200H

SST38VF6404B 01H 227EH 0EH 2210H 0FH 2201H

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