M50LPW041N データシートの表示（PDF） - STMicroelectronics

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M50LPW041N

4 Mbit (512Kb x8, Uniform Block) 3V Supply Low Pin Count Flash Memory

STMicroelectronics 

M50LPW041

Table 6. Block Addresses

Size

(Kbytes)

Address Range

Block

Number

64 70000h-7FFFFh

7

64 60000h-6FFFFh

6

64 50000h-5FFFFh

5

64 40000h-4FFFFh

4

64 30000h-3FFFFh

3

64 20000h-2FFFFh

2

64 10000h-1FFFFh

1

64 00000h-0FFFFh

0

Note: For A19 value, refer to Table 2.

Block Type

Top Block

Main Block

Main Block

Main Block

Main Block

Main Block

Main Block

Main Block

Bus Read. Bus Read operations are used to

output the contents of the Memory Array, the

Electronic Signature and the Status Register. A

valid Bus Read operation begins by latching the

Row Address and Column Address signals into

the memory using the Address Inputs, A0-A10,

and the Row/Column Address Select RC. Then

Write Enable (W) and Interface Reset (RP) must

be High, VIH, and Output Enable, G, Low, VIL, in

order to perform a Bus Read operation. The Data

Inputs/Outputs will output the value, see Figure

12, A/A Mux Interface Read AC Waveforms, and

Table 25, A/A Mux Interface Read AC

Characteristics, for details of when the output

becomes valid.

Bus Write. Bus Write operations write to the

Command Interface. A valid Bus Write operation

begins by latching the Row Address and Column

Address signals into the memory using the

Address Inputs, A0-A10, and the Row/Column

Address Select RC. The data should be set up on

the Data Inputs/Outputs; Output Enable, G, and

Interface Reset, RP, must be High, VIH and Write

Enable, W, must be Low, VIL. The Data Inputs/

Outputs are latched on the rising edge of Write

Enable, W. See Figure 13, A/A Mux Interface

Write AC Waveforms, and Table 26, A/A Mux

Interface Write AC Characteristics, for details of

the timing requirements.

Output Disable. The data outputs are high-im-

pedance when the Output Enable, G, is at VIH.

Reset. During Reset mode all internal circuits are

switched off, the memory is deselected and the

outputs are put in high-impedance. The memory is

in Reset mode when RP is Low, VIL. RP must be

held Low, VIL for tPLPH. If RP is goes Low, VIL,

during a Program or Erase operation, the

operation is aborted and the memory cells affected

no longer contain valid data; the memory can take

up to tPLRH to abort a Program or Erase operation.

COMMAND INTERFACE

All Bus Write operations to the memory are

interpreted by the Command Interface.

Commands consist of one or more sequential Bus

Write operations.

After power-up or a Reset operation the memory

enters Read mode.

The commands are summarized in Table 12,

Commands. Refer to Table 12 in conjunction with

the text descriptions below.

Read Memory Array Command. The Read Mem-

ory Array command returns the memory to its

Read mode where it behaves like a ROM or

EPROM. One Bus Write cycle is required to issue

the Read Memory Array command and return the

memory to Read mode. Once the command is is-

sued the memory remains in Read mode until an-

other command is issued. From Read mode Bus

Read operations will access the memory array.

While the Program/Erase Controller is executing a

Program or Erase operation the memory will not

accept the Read Memory Array command until the

operation completes.

Read Status Register Command. The Read Sta-

tus Register command is used to read the Status

Register. One Bus Write cycle is required to issue

the Read Status Register command. Once the

command is issued subsequent Bus Read opera-

tions read the Status Register until another com-

mand is issued. See the section on the Status

Register for details on the definitions of the Status

Register bits.

Read Electronic Signature Command. The Read

Electronic Signature command is used to read the

Manufacturer Code and the Device Code. One

Bus Write cycle is required to issue the Read

Electronic Signature command. Once the

command is issued subsequent Bus Read

operations read the Manufacturer Code or the

Device Code until another command is issued.

After the Read Electronic Signature Command is

issued the Manufacturer Code and Device Code

can be read using Bus Read operations using the

addresses in Table 11.

Program Command. The Program command

can be used to program a value to one address in

the memory array at a time. Two Bus Write

operations are required to issue the command; the

second Bus Write cycle latches the address and

data in the internal state machine and starts the

Program/Erase Controller. Once the command is

issued subsequent Bus Read operations read the

Status Register. See the section on the Status

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