HY29F080 datasheet(8/38 Pages) HYNIX

8 / 38 page

Rev. 6.1/May 01

HY29F080

The flow chart in Figure 1 illustrates the proce-

dure for protecting sector groups, and timing speci-

fications and waveforms are shown in the specifi-

cations section of this document. Verification of

protection is accomplished as described in the

Electronic ID Mode section and shown in the flow

chart.

The procedure for sector group unprotection is il-

lustrated in the flow chart in Figure 2, and timing

specifications and waveforms are given at the end

of this document. Note that to unprotect any sec-

tor group, all unprotected sector groups must first

be protected prior to the first unprotect write cycle.

Sectors can also be temporarily unprotected as

described in the next section.

Temporary Sector Group Unprotect Operation

This feature allows temporary unprotection of pre-

viously protected sectors to allow changing the

data in-system. Temporary Sector Group Unpro-

tect mode is activated by setting the RESET# pin

to V

ID. While in this mode, formerly protected sec-

tors can be programmed or erased by invoking

START

Set TRYCNT = 1

Set A9 = OE# = V

Set Address:

A[19:17] = Group to Protect

CE# = V

RESET# = V

WE# = V

Wait t

WPP1

A9 = V

A[19:17] = Group to Protect

OE# = CE# = A6 = A0 = V

A1 = V

Read Data

Data = 0x01?

Protect Another

Sector?

YES

TRYCNT = 25?

Increment TRYCNT

YES

DEVICE FAILURE

YES

Remove V

ID from A9

SECTOR PROTECT

COMPLETE

APPLY V

WE# = V

Figure 1. Sector Group Protect Procedure

the appropriate commands (see Device Com-

mands section). Once V

ID is removed from RE-

SET#, all the previously protected sectors are pro-

tected again. Figure 3 illustrates the algorithm.

Electronic ID Mode Operation

The Electronic ID mode provides manufacturer and

device identification and sector group protection

verification through identifier codes output on

DQ[7:0]. This mode is intended primarily for pro-

gramming equipment to automatically match a

device to be programmed with its corresponding

programming algorithm. The Electronic ID infor-

mation can also be obtained by the host through

a command sequence, as described in the De-

vice Commands section.

Operation in the Electronic ID mode requires V

on address pin A[9], with additional requirements

for obtaining specific data items as listed in Table

n A read cycle at address 0xXXX00 retrieves the

manufacturer code (Hynix = 0xAD).

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