LHF16KA7 데이터 시트보기 (PDF) - Sharp Electronics

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LHF16KA7

Flash Memory 16M (2MB × 8/1MB × 16)

Sharp Electronics 

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3.5 Read Identifier Codes Operation

3.6 Query Operation

The read identifier codes operation outputs the

manufacturer code, device code, block status codes

for each block (see Figure 4). Using the manufacturer

and device codes, the system CPU can automatically

match the device with its proper algorithms. The

block status codes identify locked or unlocked block

setting and erase completed or erase uncompleted

condition.

The query operation outputs the query structure.

Query database is stored in the 48Byte ROM. Query

structure allows system software to gain critical

information for controlling the flash component.

Query structure are always presented on the lowest-

order data output (DQc-DQ,) only.

3.7 Write

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Writing commands to the CUI enable reading of

device data and identifier codes. They also control

inspection and clearing of the status register. When

Vcc=Vcc1,2 and VPP=VPPHt/2/3, the CUI additionally

controls block erase, full chip erase, (multi) wordlbyte

write and block lock-bit configuration.

The Block Erase command requires appropriate

command data and an address within the block to be

erased. The Word/byte Write command requires the

command and address of the location to be written.

Set Block Lock-Bit command requires the command

and block address within the device (Block Lock) to

be locked. The Clear Block Lock-Bits command

requires the command and address within the device.

The CUI does not occupy an addressable memory

location. It is written when WE# and CE# are active.

The address and data needed to execute a command

are latched on the rising edge of WE# or CE#

(whichever goes high first). Standard microprocessor

write timings are used. Figures 19 and 20 illustrate

WE# and CE#-controlled write operations.

4 COMMAND DEFINITIONS

When the V,, voltage I V,,,,, Read operations from

the status register, identifier codes, query, or blocks

are enabled. Placing V,,,,,us on V,, enables

successful block erase, full chip erase, (multi)

word/byte write and block lock-bit configuration

operations.

Device operations are selected by writing specific

commands into the CUI. Table 4 defines these

commands.

Figure 4. Device Identifier Code Memory Map

Rev. 1.9

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