Datasheet

64 Mbit (x16) Advanced Multi-Purpose Flash Plus

SST38VF6401 / SST38VF6402 / SST38VF6403 / SST38VF6404

Data Sheet

Microchip Technology Company

The SST38VF6401/6402/6403/6404 devices provide Bypass Mode, which allows for reduced Program

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 17. for further details.

Common Flash Memory Interface (CFI)

The SST38VF6401/6402/6403/6404 contain Common Flash Memory Interface (CFI) information that

describes the characteristics of the device. In order to enter the CFI Query mode, the system can

either write a one-byte sequence using a standard CFI Query Entry command, or a three-bye

sequence using the SST CFI Query Entry command. A comparison of these two commands is shown

in Table 11. Once the device enters the CFI Query mode, the system can read CFI data at the

addresses given in Tables 13 through 16.

The system must write the CFI Exit command to return to Read mode. Note that the CFI Exit com-

mand is ignored during an internal Program or Erase operation. See Table 11 for software command

codes, Figures 17 and 18 for timing waveform, and Figures 27 and 28 for flowcharts.

Product Identification

The Product Identification mode identifies the devices as the SST38VF6401, SST38VF6402,

SST38VF6403, or SST38VF6404, and the manufacturer as SST. See Table 6 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 manufactur-

ers in the same socket. For details, see Table 11 for software operation, Figure 16 for the software ID

Entry and Read timing diagram, and Figure 27 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 Volatile Block Protection and Non-Volatile Block Protection. See Table 11 for further details.

The Read-Irreversible Block-Lock Status command indicates if the Irreversible Block Command has

been issued. If DQ

= 0, then the Irreversible Lock command has been previously issued.

In order to return to the standard Read mode, the software 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 11 for software command codes, Figure 18 for timing waveform, and Fig-

ures 27 and 28 for flowcharts.

Table 6: Product Identification

Address Data

Manufacturer’s ID 0000H BFH

Device ID

SST38VF6401 0001H 536B

SST38VF6402 0001H 536A

SST38VF6403 0001H 536D

SST38VF6404 0001H 536C

T6.0 25015