S29CD032J datasheet(51/81 Pages) SPANSION

51 / 81 page

October 11, 2012 S29CD-J_CL-J_00_B7

S29CD-J and S29CL-J Flash Family

Data

She e t

Silicon sector if the overlayed sector was undergoing programming or erasure. The host system

must ensure that the device resume any suspended program or erase operation after exiting the

Secured Silicon sector.

10.1

Secured Silicon Sector Protection Bit

The Secured Silicon Sector can be shipped unprotected, allowing customers to utilize that sector in any

manner they choose.

Please note the following:

 The Secured Silicon Sector can be read any number of times, but can be programmed and locked only

once. The Secured Silicon Sector Protection Bit must be used with caution as once locked, there is no

procedure available for unlocking the Secured Silicon Sector area and none of the bits in the Secured

Silicon Sector memory space can be modified in any way.

 Once the Secured Silicon Sector is locked and verified, the system must write the Exit Secured Silicon

Sector Region command sequence to return the device to the memory array.

10.2

Secured Silicon Sector Entry and Exit Commands

The system can access the Secured Silicon Sector region by issuing the three-cycle Enter Secured Silicon

Sector command sequence. The device continues to access the Secured Silicon Sector region until the

system issues the four-cycle Exit Secured Silicon Sector command sequence. See the Table 20.1, Memory

Array Command Definitions (x32 Mode) on page 75 and Table 20.2, Sector Protection Command Definitions

(x32 Mode) on page 76 for address and data requirements for both command sequences.

The Secured Silicon Sector Entry Command allows the following commands to be executed

 Read Secured Silicon areas

 Program Secured Silicon Sector (only once)

After the system has written the Enter Secured Silicon Sector command sequence, it can read the Secured

Silicon Sector by using the addresses listed in Table 10.1, Secured Silicon Sector Addresses on page 50.

This mode of operation continues until the system issues the Exit Secured Silicon Sector command

sequence, or until power is removed from the device.

11. Electronic Marking

Electronic marking has been programmed into the device, prior to shipment from Spansion, to ensure

traceability of individual products. The electronic marking is stored and locked within a one-time

programmable region. Detailed information on Electronic Marking will be provided in a data sheet

supplement.

12. Power Conservation Modes

12.1

Standby Mode

When the system is not reading or writing to the device, it can place the device in standby mode. In this mode,

current consumption is greatly reduced, and outputs are placed in a high impedance state, independent of

OE# input. The device enters CMOS standby mode when the CE# and RESET# inputs are both held at

VCC ± 10%. The device requires standard access time (tCE) for read access before it is ready to read data. If

the device is deselected during erasure or programming, the device draws active current until the operation is

completed.

ICC5 in DC Characteristic, CMOS Compatible on page 54 represents the standby current specification.

S29CD032J Datasheet(PDF) 51 Page - SPANSION

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