SGS Thomson Microelectronics M29W400BT70N6, M29W400BT70N1, M29W400BT70M1, M29W400BT55N1, M29W400BT55M1 Datasheet

...

4 Mbit (512Kb x8 or 256Kb x16, Boot Block)

Low Voltage Single Supply Flash Memory

■ SINGLE 2.7 to 3.6V SUPPLY VOLTAGE for

PROGRAM, ERASE and READ OPERATIONS

■ ACCESS TIME: 55ns

■ PROGRAMMING TIME

–10µs perByte/Word typical

■ 11 MEMORY BLOCKS

– 1 Boot Block (Top or Bottom Location) – 2 Parameter and 8 Main Blocks

■ PROGRAM/ERASE CONTROLLER

– Embedded Byte/Word Program algorithm – Embedded Multi-Block/Chip Erase algorithm – Status Register Polling and Toggle Bits – Ready/Busy Output Pin

■ ERASE SUSPEND and RESUME MODES

– Read and Program another Block during

Erase Suspend

■ UNLOCK BYPASS PROGRAM COMMAND

– Faster Production/Batch Programming

■ TEMPORARY BLOCK UNPROTECTION

MODE

■ LOW POWER CONSUMPTION

– Standby and Automatic Standby

■ 100,000 PROGRAM/ERASE CYCLES per

BLOCK

■ 20 YEARS DATA RETENTION

– Defectivity below 1 ppm/year

■ ELECTRONIC SIGNATURE

– Manufacturer Code: 0020h – Top Device Code M29W400BT:00EEh – Bottom Device Code M29W400BB: 00EFh

M29W400BT

M29W400BB

TSOP48 (N)

12 x 20mm

Figure 1. Logic Diagram

A0-A17

M29W400BT M29W400BB

SO44 (M)

DQ0-DQ14

DQ15A–1 BYTE RB

AI02934

1/22April 2000

M29W400BT, M29W400BB

Figure 2. TSOP Connections

A15 A14 A13 A12 A11 A10 DQ14

NC NC

RP NC NC RB NC

A17

A9 A8

M29W400BT M29W400BB

A7 A6 A5 A4 A3 A2

24 25

37 36

AI02935

A16 BYTE V

DQ15A–1 DQ7

DQ6 DQ13 DQ5 DQ12 DQ4 V

DQ11 DQ3 DQ10 DQ2 DQ9 DQ1 DQ8 DQ0 G V

E A0

Figure 3. SO Connections

NC RP

A17 A8

DQ0 DQ8

DQ9

DQ10

DQ3

DQ11

A7 A6 A5 A4 A3 A2 A1 A0

1 2 3 4 5 6 7 8 9 10 11

M29W400BT

M29W400BB

12 13 14 15 16 17DQ1 18 19 20 21

44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 2322

AI02936

WRB

A9 A10 A11 A12 A13 A14 A15 A16 BYTE V

DQ15A–1 DQ7 DQ14 DQ6 DQ13 DQ5DQ2 DQ12 DQ4 V

Table 1. Signal Names

A0-A17 Address Inputs DQ0-DQ7 Data Inputs/Outputs DQ8-DQ14 Data Inputs/Outputs DQ15A–1 Data Input/Output or Address Input E Chip Enable G Output Enable W Write Enable RP Reset/Block Temporary Unprotect RB Ready/Busy Output BYTE Byte/Word Organization Select V

NC Not Connected Internally

2/22

Supply Voltage Ground

SUMMARY DESCRIPTION

The M29W400B is a 4 Mbit (512Kb x8 or 256Kb x16) non-volatile memory that can be read,erased and reprogrammed. These operations can be performed using a single low voltage (2.7 to 3.6V) supply. On power-up the memory defaults to its Read mode where it can be read in the same way as a ROM or EPROM. The M29W400B is fully backward compatible with the M29W400.

The memory is divided into blocks that can be erased independently so it is possible to preserve valid data whileolddata is erased. Each block can be protected independently to prevent accidental Program or Erase commands from modifying the memory. Program and Erase commands arewritten to the Command Interface of the memory. An on-chip Program/Erase Controller simplifies the process ofprogramming or erasing the memory by taking care of all of the special operations that are required to update the memory contents. The end of a program or erase operation can be detected and any error conditions identified. The command set required to control the memory is consistent with JEDEC standards.

M29W400BT, M29W400BB

Table 2. Absolute Maximum Ratings

Symbol Parameter Value Unit

BIAS

STG

(2)

Note: 1. Except for the rating ”Operating Temperature Range”, stresses above those listedin the Table ”Absolute Maximum Ratings” may

cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extendedperiods may affect device reliability. Refer also to the STMicroelectronics SURE Program andother relevant quality documents.

2. Minimum Voltage mayundershoot to –2V during transition and for less than 20ns during transitions.

Ambient Operating Temperature (Temperature Range Option 1) 0 to 70 °C Ambient Operating Temperature (Temperature Range Option 6) –40 to 85 °C Temperature Under Bias –50 to 125 °C Storage Temperature –65 to 150 °C

Input or Output Voltage –0.6 to 4 V Supply Voltage –0.6 to 4 V Identification Voltage –0.6 to 13.5 V

Table 3. Top Boot Block Addresses M29W400BT

Size

(Kbytes)

10 16 7C000h-7FFFFh 3E000h-3FFFFh

9 8 7A000h-7BFFFh 3D000h-3DFFFh 8 8 78000h-79FFFh 3C000h-3CFFFh 7 32 70000h-77FFFh 38000h-3BFFFh 6 64 60000h-6FFFFh 30000h-37FFFh 5 64 50000h-5FFFFh 28000h-2FFFFh 4 64 40000h-4FFFFh 20000h-27FFFh 3 64 30000h-3FFFFh 18000h-1FFFFh 2 64 20000h-2FFFFh 10000h-17FFFh 1 64 10000h-1FFFFh 08000h-0FFFFh 0 64 00000h-0FFFFh 00000h-07FFFh

Address Range

(x8)

(1)

Address Range

(x16)

Table 4. Bottom Boot Block Addresses M29W400BB

Size

(Kbytes)

10 64 70000h-7FFFFh 38000h-3FFFFh

9 64 60000h-6FFFFh 30000h-37FFFh 8 64 50000h-5FFFFh 28000h-2FFFFh 7 64 40000h-4FFFFh 20000h-27FFFh 6 64 30000h-3FFFFh 18000h-1FFFFh 5 64 20000h-2FFFFh 10000h-17FFFh 4 64 10000h-1FFFFh 08000h-0FFFFh 3 32 08000h-0FFFFh 04000h-07FFFh 2 8 06000h-07FFFh 03000h-03FFFh 1 8 04000h-05FFFh 02000h-02FFFh 0 16 00000h-03FFFh 00000h-01FFFh

Address Range

(x8)

Address Range

(x16)

The blocks in the memory are asymmetrically arranged, seeTables 3 and4,Block Addresses.The first or last 64 Kbytes have been divided into four additional blocks. The 16 KbyteBoot Blockcan be used for small initialization code to start the microprocessor, the two 8 Kbyte Parameter Blocks can be used for parameter storage and the remaining 32K is a small Main Block where the application may be stored.

Chip Enable, Output Enableand Write Enable signals control the bus operation of the memory. They allow simple connection to most microprocessors, often without additional logic.

The memory is offered in TSOP48 (12 x 20mm) and SO44 packages and it is supplied with all the bits erased (set to ’1’).

3/22

M29W400BT, M29W400BB

SIGNAL DESCRIPTIONS

See Figure 1, Logic Diagram, and Table 1, Signal Names, for a brief overview of thesignalsconnected to this device.

Address Inputs (A0-A17). The Address Inputs select the cells in the memory array to access during BusRead operations. During Bus Write operations they control the commands sent to the Command Interface of the internal state machine.

Data Inputs/Outputs (DQ0-DQ7). The Data Inputs/Outputs output the data stored at the selected address during a Bus Readoperation. During Bus Write operations they represent the commands sent to the Command Interface of the internal state machine.

Data Inputs/Outputs (DQ8-DQ14). The Data Inputs/Outputs output the data stored at the selected address during a Bus Read operation when BYTE is High, VIH. When BYTE is Low, VIL, these pins are not used and are high impedance. During Bus Write operations the Command Register does not use these bits. When reading the Status Register these bits should be ignored.

Data Input/Output or Address Input (DQ15A-1).

When BYTE is High, VIH, this pin behaves as a Data Input/Output pin (as DQ8-DQ14). When BYTE is Low, VIL, this pin behaves asan address pin; DQ15A–1 Low willselect the LSB of the Word on the other addresses, DQ15A–1 Highwill select the MSB. Throughout the text consider references to the Data Input/Output to include this pin when BYTE is High and references to the Address Inputs to include this pin when BYTE is Low except when stated explicitly otherwise.

Chip Enable (E). The Chip Enable, E, activates the memory,allowing BusRead and Bus Write operations to be performed. When Chip Enable is High, VIH, all other pins are ignored.

Output Enable (G). The Output Enable, G, controls the Bus Read operation of the memory.

Write Enable (W). The Write Enable, W, controls the Bus Write operation of the memory’s Command Interface.

Reset /B loc kTe mp orar y Unp rote c t(RP). The Re- set/Block TemporaryUnprotect pin can be used to apply a Hardware Reset to the memory or to temporarily unprotect all Blocks that have been protected.

A Hardware Reset is achieved by holding Reset/ Block Temporary Unprotect Low, VIL, for at least t

. After Reset/Block Temporary Unprotect

PLPX

goes High, VIH, the memory will be ready for Bus Read and Bus Write operations after t

PHEL

, whichever occurs last. See the Ready/Busy

RHEL

Output section, Table 17 and Figure 11, Reset/ Temporary Unprotect ACCharacteristics for more details.

Holding RP at VIDwill temporarily unprotect the protected Blocks in the memory. Program and Erase operations on all blocks will be possible. The transition from VIHtoVIDmust be slower than t

PHPHH

Ready/Busy Output (RB). The Ready/Busy pin is an open-drain output that can be used to identify when the memoryarray can be read. Ready/Busy is high-impedance during Readmode, Auto Select mode and Erase Suspend mode.

After a Hardware Reset, Bus Read and Bus Write operations cannot begin until Ready/Busy becomes high-impedance. See Table 17 and Figure 11, Reset/Temporary Unprotect AC Characteristics.

During Program or Erase operations Ready/Busy is Low, VOL. Ready/Busy will remain Low during Read/Reset commands or Hardware Resets until the memory is ready to enter Read mode.

The use of an open-drain output allows the Ready/ Busy pins from several memories to be connected to asinglepull-up resistor. A Low will then indicate that one, or more, of the memories is busy.

Byte/Word OrganizationSe lect (BYTE) . The Byte/ Word Organization Select pin is used to switch between the 8-bit and 16-bit Bus modes ofthe memory. When Byte/Word Organization Select is Low, VIL, the memory is in 8-bit mode, when it is High, VIH, the memory is in 16-bit mode.

VCCSupply Voltage. The VCCSupply Voltage supplies the power for all operations (Read, Program, Erase etc.).

The Command Interface is disabled when the V

Supply Voltage is less than the Lockout Voltage, V

. Thisprevents Bus Write operations from ac-

LKO

cidentally damaging the data during power up, power down and power surges. If the Program/ Erase Controller is programming or erasing during this time then the operation aborts and the memory contents being altered will be invalid.

A 0.1µF capacitor should be connected between the VCCSupply Voltage pin and the VSSGround pin to decouple the current surges from the power supply. ThePCB track widths must besufficient to carry the currents required during program and erase operations, I

CC3

VSSGround. The VSSGroundis thereferencefor all voltage measurements.

4/22

M29W400BT, M29W400BB

BUS OPERATIONS

There are five standard bus operations that control the device. These are Bus Read, Bus Write, OutPut Disable, Standby andAutomatic Standby. See Tables 5 and 6, Bus Operations, for a summary. Typically glitches of less than 5ns on Chip Enable or WriteEnableare ignoredby the memory and do not affect bus operations.

Bus Read. Bus Read operations read from the memory cells, or specific registers in the Command Interface. A valid Bus Read operation involves setting the desired address on the Address Inputs, applying a Low signal, VIL, to Chip Enable and Output Enable and keeping Write Enable High, VIH. The Data Inputs/Outputs will output the value, see Figure 8, Read Mode AC Waveforms, and Table 14, 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 setting the desired address on the Address Inputs. The Address Inputs are latched by the CommandInterface on the falling edgeof Chip

Table 5. Bus Operations, BYTE = V

Operation E G W

Bus Read Bus Write Output Disable X V Standby Read Manufacturer

Code

Read Device Code

Note: X = VILor VIH.

X X X Hi-Z Hi-Z

Cell Address Hi-Z Data Output

Command Address Hi-Z Data Input

X Hi-Z Hi-Z

A0 = VIL,A1=VIL,A9=VID,

Others V A0 = VIH,A1=VIL,A9=VID,

Others V

Enable or Write Enable, whichever occurs last. The Data Inputs/Outputs are latched by the Command Interface on the rising edge of Chip Enable or WriteEnable,whichever occurs first.OutputEnable must remain High, VIH, during the whole Bus Write operation. See Figures 9 and 10, Write AC Waveforms, and Tables 15 and 16, Write AC Characteristics, for details of the timing requirements.

Output Disable. The Data Inputs/Outputs are in the high impedance state when Output Enable is High, VIH.

Standby. When Chip Enable is High, VIH, the memory enters Standby mode and the Data Inputs/Outputs pins are placed in the high-impedance state. To reduce the Supply Current to the Standby Supply Current, I

, Chip Enableshould

CC2

be held within VCC± 0.2V. For the Standby current level see Table 13, DC Characteristics.

During program or erase operations the memory will continue to use the Program/Erase Supply Current, I

, forProgramorErase operations un-

CC3

til the operation completes.

Address Inputs

DQ15A–1, A0-A17

or V

Data Inputs/Outpu ts

DQ14-DQ8 DQ7-DQ0

Hi-Z 20h

Hi-Z

EEh (M29W400BT) EFh (M29W400BB)

Table 6. Bus Operations, BYTE = V

Operation E G W

Bus Read V Bus Write Output Disable X Standby Read Manufacturer

Code

Read Device Code

Note: X = VILor VIH.

X X X Hi-Z

Address Inputs

A0-A17

Cell Address Data Output

Command Address Data Input

X Hi-Z

A0 = VIL,A1=VIL,A9=VID,

Others V A0 = VIH,A1=VIL,A9=VID,

Others V

or V

Data Inputs/Outpu ts

DQ15A–1, DQ14-DQ0

0020h

00EEh (M29W400BT) 00EFh (M29W400BB)

5/22

M29W400BT, M29W400BB

Automatic Standby. If CMOS levels (VCC± 0.2V)

are usedto drive the bus and the bus is inactive for 150ns or more the memory enters Automatic Standby where the internal Supply Current is reduced to the Standby Supply Current, I

CC2

. The Data Inputs/Outputs will still output data if a Bus Read operation is in progress.

Special Bus Operations

Additional bus operations can be performed to read the Electronic Signature and also to apply and remove Block Protection. These bus operations are intended for use by programming equipment and are not usually used in applications. They require VIDto be applied to some pins.

Electronic Signature. The memory has two codes, the manufacturer code and the device code, that can be read to identify the memory. These codes can be read by applying the signals listed in Tables 5 and 6, Bus Operations.

BlockProtection andBlocks Unprotection. Each block can be separately protected against accidental Programor Erase. Protected blocks can be unprotected to allow data to be changed.

There are two methods available for protecting and unprotecting the blocks, one for use on programming equipment and the other for in-system use. For further information refer to Application Note AN1122, Applying Protection and Unprotection to M29 Series Flash.

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. Failure to observe a valid sequence of Bus Write operations will result in the memory returning to Read mode. The long command sequences are imposed to maximize data security.

The address used for the commands changes depending on whether the memory is in 16-bit or 8bit mode. See either Table 7, or 8, depending on the configuration that is being used, for a summary of the commands.

Read/Reset Command. The Read/Reset command returnsthe memory to its Read modewhere it behaves like a ROM or EPROM. It also resets the errors in the Status Register. Either one or three Bus Write operations can be used to issue the Read/Reset command.

If the Read/Reset command is issued during a Block Eraseoperationor following a Programming or Erase error then the memory will take up to 10µs to abort. Duringthe abort period no valid data can be read from the memory. Issuing a Read/Reset command during a Block Erase operation will leave invalid data in the memory.

Auto Select Command. The Auto Select command is used to read the Manufacturer Code, the Device Code and the Block Protection Status. Three consecutive Bus Write operations are required to issue the Auto Select command. Once the Auto Select command is issued the memory remains in Auto Select mode until another command is issued.

From the Auto Select mode the Manufacturer Code can be read using a Bus Read operation with A0 = VILandA1 = VIL. The other address bits may be set to either VILor VIH. The Manufacturer Code for STMicroelectronics is 0020h.

The Device Code can be read using a Bus Read operation with A0 = VIHand A1 = VIL. The other address bits may be set to either VILor VIH. The Device Code for the M29W400BT is 00EEh and for the M29W400BB is 00EFh.

The Block Protection Status of each block can be read using a Bus Read operation with A0 = VIL, A1 = VIH, and A12-A17 specifying the address of the block. The otheraddress bits may beset to either VILor VIH. If the addressed block is protected then 01h is output on Data Inputs/Outputs DQ0DQ7, otherwise 00h is output.

Program Command. The Program command can be used to program a value to oneaddress in the memory array at a time. The command requires fourBus Write operations, the final write operation latches theaddress and data in the internal state machine and starts the Program/Erase Controller.

If the address falls in a protected block then the Program command is ignored, the data remains unchanged. The Status Register is never read and no error condition is given.

During the program operation the memory will ignore all commands. It is not possible to issue any command to abort or pause the operation. Typical program times are givenin Table 9. Bus Read operations during the program operation will output the Status Register on the Data Inputs/Outputs. See the section on the Status Register for more details.

After the program operation has completed the memory will return to the Read mode, unless an error has occurred. When an error occurs the memory will continue to output the Status Register. A Read/Reset command must be issued to reset the error condition and return to Read mode.

Note that the Program command cannot change a bit set at ’0’ back to ’1. One of the Erase Commands must be used to set all the bits in a block or in the whole memory from ’0’ to ’1’.

6/22

M29W400BT, M29W400BB

Table 7. Commands, 16-bit mode, BYTE = V

Bus Write Operations

Command

Read/Reset

1X F0 3 555 AA 2AA 55 X F0

1st 2nd 3rd 4th 5th 6th

Length

Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data

Auto Select 3 555 AA 2AA 55 555 90 Program 4 555 AA 2AA 55 555 A0 PA PD Unlock Bypass 3 555 AA 2AA 55 555 20 Unlock Bypass

Program

2X A0PAPD

Unlock Bypass Reset 2 X 90 X 00 Chip Erase 6 555 AA 2AA 55 555 80 555 AA 2AA 55 555 10 Block Erase 6+ 555 AA 2AA 55 555 80 555 AA 2AA 55 BA 30 Erase Suspend 1 X B0 Erase Resume 1 X 30

Table 8. Commands, 8-bit mode, BYTE = V

Bus Write Operations

Command

Read/Reset

1X F0 3 AAA AA 555 55 X F0

1st 2nd 3rd 4th 5th 6th

Length

Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data

Auto Select 3 AAA AA 555 55 AAA 90 Program 4 AAA AA 555 55 AAA A0 PA PD Unlock Bypass 3 AAA AA 555 55 AAA 20 Unlock Bypass

Program

2X A0PAPD

Unlock Bypass Reset 2 X 90 X 00 Chip Erase 6 AAA AA 555 55 AAA 80 AAA AA 555 55 AAA 10 Block Erase 6+ AAA AA 555 55 AAA 80 AAA AA 555 55 BA 30 Erase Suspend 1 X B0 Erase Resume 1 X 30

Note: X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block. All values in the table are in hexadecimal.

The Command Interface only uses A–1, A0-A10 and DQ0-DQ7 to verify the commands; A11-A17, DQ8-DQ14 and DQ15 are Don’t Care. DQ15A–1 is A–1 when BYTE is V

Read/Reset. After a Read/Reset command, read the memory as normal until another command is issued. Auto Select. After an Auto Select command, read Manufacturer ID, Device ID or Block Protection Status. Program, Unlock Bypass Program, Chip Erase, Block Erase. After these commands read the Status Register until the Program/Erase

Controller completes and the memory returns to Read Mode. Add additional Blocks during Block Erase Command with additional Bus Write Operations until Timeout Bit is set.

Unlock Bypass. After the Unlock Bypass command issue Unlock Bypass Program or Unlock Bypass Reset commands. Unlock Bypass Reset. After the Unlock Bypass Reset command read the memory asnormal until another command is issued. Erase Suspend. After theErase Suspend command read non-erasing memory blocks asnormal, issue Auto Select and Programcommands

on non-erasing blocks as normal. Erase Resume. After the Erase Resume command the suspended Erase operation resumes, read the Status Register until the Program/

Erase Controller completes and the memory returns to Read Mode.

or DQ15 when BYTE is VIH.

7/22

+ 15 hidden pages