S29CD032G datasheet(27/93 Pages) SPANSION

27 / 93 page

March 22, 2004 30606B0

S29CD032G

Ad va nc e

In forma t i o n

Initial Access Delay Configuration

The frequency configuration informs the device of the number of clocks that must

elapse after ADV# is driven active before data will be available. This value is de-

termined by the input clock frequency.

Sector Protection

The device features several levels of sector protection, which can disable both the

program and erase operations in certain sectors or sector groups

Sector and Sector Groups

The distinction between sectors and sector groups is fundamental to sector pro-

tection. Sector are individual sectors that can be individually sector protected/

unprotected. These are the outermost 4 Kword boot sectors, that is, SA0 to SA7

and SA70 to SA77. See Tables 12 and 13.

Sector groups are a collection of three or four adjacent 32 kword sectors. For ex-

ample, sector group SG8 is comprised of sector SA8 to SA10. When any sector in

a sector group is protected/unprotected, every sector in that group is protection/

unprotected. See Tables 12 and 13.

Persistent Sector Protection

A command sector protection method that replaces the old 12 V controlled pro-

tection method.

Password Sector Protection

A highly sophisticated protection method that requires a password before

changes to certain sectors or sector groups are permitted

WP# Hardware Protection

A write protect pin that can prevent program or erase to the two outermost 8

Kbytes sectors in the 75% bank

All parts default to operate in the Persistent Sector Protection mode. The cus-

tomer must then choose if the Persistent or Password Protection method is most

desirable. There are two one-time programmable non-volatile bits that define

which sector protection method will be used. If the customer decides to continue

using the Persistent Sector Protection method, they must set the Persistent

Sector Protection Mode Locking Bit. This will permanently set the part to op-

erate only using Persistent Sector Protection. If the customer decides to use the

password method, they must set the Password Mode Locking Bit. This will

permanently set the part to operate only using password sector protection.

Table 10. Configuration Register After Device Reset

CR15

CR14

CR13

CR12

CR11

CR10

CR9

CR8

Reserve

IAD3

IAD2

IAD1

IAD0

DOC

Reserve

CR7

CR6

CR5

CR4

CR3

CR2

CR1

CR0

Reserve

BL2

BL1

BL0

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