HY29LV400 datasheet(10/40 Pages) HYNIX

Part #	HY29LV400

Description	4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory

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Manufacturer	HYNIX [Hynix Semiconductor]

Direct Link	http://www.skhynix.com/kor/main.do

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10

Rev. 1.0/Nov. 01

HY29LV400

START

(Note: All sectors must be

protected prior to

unprotecting any sector)

TRYCNT = 1

SNUM = 0

RESET# = V

ID

Wait 1 us

Write 0x60 to device

Write 0x60 to Address

Set Address:

A[17:12] = Sector SNUM

A[6] = 1, A]1] = 1, A]0] = 0

Write 0x40 to Address

Read from Address

Data = 0x00?

SNUM = 10?

YES

TRYCNT = 1000?

NO

Increment TRYCNT

NO

YES

DEVICE FAILURE

YES

NO

RESET# = V

IH

Write Reset Command

SECTOR UNPROTECT

COMPLETE

SNUM = SNUM + 1

Wait 15 ms

Set Address:

A[6] = 1, A]1] = 1, A]0] = 0

Figure 2. Sector Unprotect Algorithm

START

RESET# = V

ID

(All protected sectors

become unprotected)

Perform Program or Erase

Operations

RESET# = V

IH

(All previously protected

sectors return to protected

state)

TEMPORARY SECTOR

UNPROTECT COMPLETE

Figure 3. Temporary Sector Unprotect

Algorithm

grammed with its corresponding programming al-

gorithm.

Two methods are provided for accessing the Elec-

tronic ID data. The first requires V

ID on address

pin A[9], with additional requirements for obtain-

ing specific data items listed in Table 4. The Elec-

tronic ID data can also be obtained by the host

through specific commands issued via the com-

mand register, as described in the ‘Device Com-

mands’ section of this data sheet.

While in the high-voltage Electronic ID mode, the

system may read at specific addresses to obtain

certain device identification and status information:

n A read cycle at address 0xXXX00 retrieves the

manufacturer code.

n A read cycle at address 0xXXX01 in Word

mode or 0xXXX02 in Byte mode returns the

device code.

n A read cycle containing a sector address (SA)

in A[17:12] and the address 0x02 in Word mode

or 0x04 in Byte mode, returns 0x01 if that sec-

tor is protected, or 0x00 if it is unprotected.

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