ATMEL AT49BV640D User Manual

Features

•

Single Voltage Operation Read/Write: 2.65V - 3.6V

•

Access Time – 70 ns

•

Sector Erase Architecture

– One Hundred Twenty-seven 32K Word (64K Bytes) Main Sectors with

Individual Write Lockout

– Eight 4K Word (8K Bytes) Sectors with Individual Write Lockout

•

Fast Word Program Time – 10 µs

•

Typical Sector Erase Time: 32K Word Sectors – 700 ms; 4K Word Sectors – 100 ms

•

Suspend/Resume Feature for Erase and Program

– Supports Reading and Programming Data from Any Sector by Suspending

Erase of a Different Sector

– Supports Reading Any Word by Suspending Programming of Any Other Word

•

Low-power Operation

– 10 mA Active – 15 µA Standby

•

VPP Pin for Write Protection and Accelerated Program Operation

•

WP Pin for Sector Protection

•

RESET Input for Device Initialization

•

Flexible Sector Protection

•

Top or Bottom Boot Block Configuration Available

•

128-bit Protection Register

•

Minimum 100,000 Erase Cycles

•

Common Flash Interface (CFI)

•

Green (Pb/Halide-free/RoHS Compliant) Packaging

64-megabit (4M x 16) 3-volt Only Flash Memory

AT49BV640D AT49BV640DT

1. Description

The AT49BV640D(T) is a 2.7-volt 32-megabit Flash memory organized as 4,194,304 words of 16 bits each. The memory is divided into 135 sectors for erase operations. The device is offered in a 56-lead TSOP and a 48-ball CBGA packages. The device has CE or reprogrammed using a single power supply, making it ideally suited for in-system programming.

The device powers on in the read mode. Command sequences are used to place the device in other operation modes such as program and erase. The device has the capability to protect the data in any sector (see “Flexible Sector Protection” on

page 6).

To increase the flexibility of the device, it contains an Erase Suspend and Program Suspend feature. This feature will put the erase or program on hold for any amount of time and let the user read data from or program data to any of the remaining sectors within the memory.

The VPP pin provides data protection. When the V and erase functions are inhibited. When V and erase operations can be performed. With V Program command) operation is accelerated.

and OE control signals to avoid any bus contention. This device can be read

input is below 0.4V, the program

is at 1.65V or above, normal program

at 10.0V, the program (Dual-word

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2. Pin Configurations

Pin Name Pin Function

A0 - A21 Addresses

Chip Enable

RESET

Output Enable

Write Enable

Reset

VPP Write Protection and Power Supply for Accelerated Program Operations

I/O0 - I/O15 Data Inputs/Outputs

NC No Connect

VCCQ Output Power Supply

2.1 56-lead TSOP Top View

A9 A8

WE WP

A7 A6 A5 A4 A3 A2

A1 NC NC

1 2

4 5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

A15 A14 A13 A12 A11 A10

A21 A20

VSS

VCC

A19 A18 A17

VSS

Write Protect

56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40

39 38 37 36 35 34 33 32 31 30

NC A16 I/O15 I/O7 I/O14 I/O6 I/O13 I/O5 I/O12 I/O4 NC NC RESET VPP I/O11 I/O3 I/O10 I/O2 VCCQ I/O9 I/O1 I/O8 I/O0 VCC OE VSS CE A0

2.2 48-ball CBGA – Top View

234567

A11

A13

A10

A14

A12

A15

I/O5

I/O14

A16

I/O6

I/O15

VCCQ

I/O13

I/O7

GND

VPP

RST

A21

I/O11

I/O12

I/O4

A18

A20

I/O2

I/O3

VCC

A19

A17

I/O8

I/O9

I/O10

I/O0

I/O1

GND

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3. Block Diagram

AT49BV640D(T)

I/O0 - I/O15

A0 - A21

INPUT

BUFFER

ADDRESS

LATCH

Y-DECODER

X-DECODER

OUTPUT BUFFER

OUTPUT

MULTIPLEXER

IDENTIFIER

STAT US

DATA

COMPARATOR

Y-GATING

MAIN

MEMORY

INPUT

BUFFER

DATA

COMMAND REGISTER

WRITE STAT E

MACHINE

PROGRAM/ERASE VOLTAGE SWITCH

CE WE OE RESET WP

VPP

VCC GND

4. Device Operation

4.1 Command Sequences

When the device is first powered on, it will be in the read mode. Command sequences are used to place the device in other operating modes such as program and erase. The command sequences are written by applying a low pulse on the WE applying a low-going pulse on the CE on the first rising edge of the WE the CE affected by entering the command sequences.

4.2 Read

The AT49BV640D(T) is accessed like an EPROM. When CE and OE are low and WE is high, the data stored at the memory location determined by the address pins are asserted on the outputs. The outputs are put in the high impedance state whenever CE dual-line control gives designers flexibility in preventing bus contention.

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input with CE low and OE high or by

input with WE low and OE high. The address is latched

or CE. Valid data is latched on the rising edge of the WE or

pulse, whichever occurs first. The addresses used in the command sequences are not

or OE is high. This

4.3 Reset

A RESET input pin is provided to ease some system applications. When RESET is at a logic high level, the device is in its standard operating mode. A low level on the RESET present device operation and puts the outputs of the device in a high-impedance state. When a high level is reasserted on the RESET

4.4 Erase

Before a word can be reprogrammed it must be erased. The erased state of the memory bits is a logical “1”. The individual sectors can be erased by using the Sector Erase command.

4.4.1 Sector Erase

The device is organized into 135 sectors (SA0 - SA134) that can be individually erased. The Sector Erase command is a two-bus cycle operation. The sector address and the D0H Data Input command are latched on the rising edge of WE edge of WE operation is internally controlled; it will automatically time to completion. The maximum time to erase a sector is t operation terminating immediately.

4.5 Word Programming

Once a memory sector is erased, it is programmed (to a logical “0”) on a word-by-word basis. Programming is accomplished via the Internal Device command register and is a two-bus cycle operation. The device will automatically generate the required internal program pulses.

pin halts the

pin, the device returns to read mode.

. The sector erase starts after the rising

of the second cycle provided the given sector has not been protected. The erase

. An attempt to erase a sector that has been protected will result in the

SEC

4.6 VPP Pin

Any commands except Read Status Register, Program Suspend and Program Resume written to the chip during the embedded programming cycle will be ignored. If a hardware reset happens during programming, the data at the location being programmed will be corrupted. Please note that a data “0” cannot be programmed back to a “1”; only erase operations can convert “0”s to “1”s. Programming is completed after the specified t gram status bit is a “1”, the device was not able to verify that the program operation was performed successfully. The status register indicates the programming status. While the program sequence executes, status bit I/O7 is “0”.

The circuitry of the AT49BV640D(T) is designed so that the device cannot be programmed or erased if the V and erase operations can be performed. The VPP pin cannot be left floating.

voltage is less that 0.4V. When VPP is at 1.65V or above, normal program

cycle time. If the pro-

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4.7 Read Status Register

The status register indicates the status of device operations and the success/failure of that operation. The Read Status Register command causes subsequent reads to output data from the status register until another command is issued. To return to reading from the memory, issue a Read command.

The status register bits are output on I/O7 - I/O0. The upper byte, I/O15 - I/O8, outputs 00H when a Read Status Register command is issued.

AT49BV640D(T)

The contents of the status register [SR7:SR0] are latched on the falling edge of OE (whichever occurs last), which prevents possible bus errors that might occur if status register contents change while being read. CE

or OE must be toggled with each subsequent status

read, or the status register will not indicate completion of a Program or Erase operation.

When the Write State Machine (WSM) is active, SR7 will indicate the status of the WSM; the remaining bits in the status register indicate whether the WSM was successful in performing the preferred operation (see Table 4-1).

Table 4-1. Status Register Bit Definition

WSMS ESS ES PRS VPPS PSS SLS R

76543210

Notes

SR7 WRITE STATE MACHINE STATUS (WSMS) 1 = Ready 0 = Busy

SR6 = ERASE SUSPEND STATUS (ESS) 1 = Erase Suspended 0 = Erase In Progress/Completed

SR5 = ERASE STATUS (ES) 1 = Error in Sector Erase 0 = Successful Sector Erase

Check Write State Machine bit first to determine Word Program or Sector Erase completion, before checking program or erase status bits.

When Erase Suspend is issued, WSM halts execution and sets both WSMS and ESS bits to “1” – ESS bit remains set to “1” until an Erase Resume command is issued.

When this bit is set to “1”, WSM has applied the max number of erase pulses to the sector and is still unable to verify successful sector erasure.

or CE

SR4 = PROGRAM STATUS (PRS) 1 = Error in Programming 0 = Successful Programming

SR3 = VPP STATUS (VPPS) 1 = VPP Low Detect, Operation Abort 0 = VPP OK

SR2 = PROGRAM SUSPEND STATUS (PSS) 1 = Program Suspended 0 = Program in Progress/Completed

SR1 = SECTOR LOCK STATUS (SLS) 1 = Prog/Erase attempted on a locked sector; Operation aborted. 0 = No operation to locked sectors

SR0 = Reserved for Future Enhancements (R)

Note: 1. A Command Sequence Error is indicated when SR1, SR3, SR4 and SR5 are set.

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When this bit is set to “1”, WSM has attempted but failed to program a word

The V level. The WSM interrogates V Erase command sequences have been entered and informs the system if VPP has not been switched on. The VPP is also checked before the operation is verified by the WSM.

When Program Suspend is issued, WSM halts execution and sets both WSMS and PSS bits to “1”. PSS bit remains set to “1” until a Program Resume command is issued.

If a Program or Erase operation is attempted to one of the locked sectors, this bit is set by the WSM. The operation specified is aborted and the device is returned to read status mode.

This bit is reserved for future use and should be masked out when polling the status register.

status bit does not provide continuous indication of VPP

level only after the Program or

4.8 Clear Status Register

The WSM can set status register bits 1 through 7 and can clear bits 2, 6 and 7; but, the WSM cannot clear status register bits 1, 3, 4 or 5. Because bits 1, 3, 4 and 5 indicate various error conditions, these bits can be cleared only through the Clear Status Register command. By allowing the system software to control the resetting of these bits, several operations may be performed (such as cumulatively programming several addresses or erasing multiple sectors in sequence) before reading the status register to determine if an error occurred during those operations. The status register should be cleared before beginning another operation. The Read command must be issued before data can be read from the memory array. The status register can also be cleared by resetting the device.

4.9 Flexible Sector Protection

The AT49BV640D(T) offers two sector protection modes, the Softlock and the Hardlock. The Softlock mode is optimized as sector protection for sectors whose content changes frequently. The Hardlock protection mode is recommended for sectors whose content changes infrequently. Once either of these two modes is enabled, the contents of the selected sector is read-only and cannot be erased or programmed. Each sector can be independently programmed for either the Softlock or Hardlock sector protection mode. At power-up and reset, all sectors have their Softlock protection mode enabled.

4.9.1 Softlock and Unlock

The Softlock protection mode can be disabled by issuing a two-bus cycle Unlock command to the selected sector. Once a sector is unlocked, its contents can be erased or programmed. To enable the Softlock protection mode, a two-bus cycle Softlock command must be issued to the selected sector.

4.9.2 Hardlock and Write Protect (WP

The Hardlock sector protection mode operates in conjunction with the Write Protection (WP pin. The Hardlock sector protection mode can be enabled by issuing a two-bus cycle Hardlock software command to the selected sector. The state of the Write Protect pin affects whether the Hardlock protection mode can be overridden.

• When the WP pin is low and the Hardlock protection mode is enabled, the sector cannot be unlocked and the contents of the sector is read-only.

• When the WP pin is high, the Hardlock protection mode is overridden and the sector can be unlocked via the Unlock command.

To disable the Hardlock sector protection mode, the chip must be either reset or power cycled.

)

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AT49BV640D(T)

Table 4-2. Hardlock and Softlock Protection Configurations in Conjunction with WP

Erase/

Hard-

/5V 0 0 0 Yes No sector is locked

lock

VCC/5V 0 0 1 No

/5V 0 1 1 No

/5V 1 0 0 Yes No sector is locked.

VCC/5V 1 0 1 No

/5V 1 1 0 Yes

/5V 1 1 1 No

xx x No

Soft-

lock

Prog

Allowed? Comments

Sector is Softlocked. The Unlock command can unlock the sector.

Hardlock protection mode is enabled. The sector cannot be unlocked.

Sector is Softlocked. The Unlock command can unlock the sector.

Hardlock protection mode is overridden and the sector is not locked.

Hardlock protection mode is overridden and the sector can be unlocked via the Unlock command.

Erase and Program Operations cannot be performed.

Figure 4-1. Sector Locking State Diagram

UNLOCKED LOCKED

60h/ D0h

60h/D0h

60h/ D0h

WP = V

[000] [001]

[110]

[100]

60h/01h

60h/ 2Fh

60h/

01h

60h/ 2Fh

[011]

60h/

01h

[111]

[101]

60h/D0h = Unlock Comman d 60h/01h = Softlock Command 60h/2Fh = Hardlock Command

Power-Up/Rese t

Default

Hardlocked

Hardlocked is disabled by

WP = V

60h/

Power-Up/Rese t

2Fh

Default

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Note: 1. The notation [X, Y, Z] denotes the locking state of a sector. The current locking state of a

sector is defined by the state of WP

and the two bits of the sector-lock status D[1:0].

4.9.3 Sector Protection Detection

A software method is available to determine if the sector protection Softlock or Hardlock features are enabled. When the device is in the software product identification mode a read from the I/O0 and I/O1 at address location 00002H within a sector will show if the sector is unlocked, softlocked, or hardlocked.

Table 4-3. Sector Protection Status

I/O1 I/O0 Sector Protection Status

0 0 Sector Not Locked

0 1 Softlock Enabled

1 0 Hardlock Enabled

1 1 Both Hardlock and Softlock Enabled

4.10 Erase Suspend/Erase Resume

The Erase Suspend command allows the system to interrupt a sector erase operation and then program or read data from a different sector within the memory. After the Erase Suspend command is given, the device requires a maximum time of 15 µs to suspend the erase operation. After the erase operation has been suspended, the system can then read data or program data to any other sector within the device. An address is not required during the Erase Suspend command. During a sector erase suspend, another sector cannot be erased. To resume the sector erase operation, the system must write the Erase Resume command. The Erase Resume command is a one-bus cycle command. The only valid commands while erase is suspended are Read Status Register, Product ID Entry, CFI Query, Program, Program Resume, Erase Resume, Sector Softlock/Hardlock, and Sector Unlock.

4.11 Program Suspend/Program Resume

The Program Suspend command allows the system to interrupt a programming operation and then read data from a different word within the memory. After the Program Suspend command is given, the device requires a maximum of 10 µs to suspend the programming operation. After the programming operation has been suspended, the system can then read from any other word within the device. An address is not required during the program suspend operation. To resume the programming operation, the system must write the Program Resume command. The program suspend and resume are one-bus cycle commands. The command sequence for the erase suspend and program suspend are the same, and the command sequence for the erase resume and program resume are the same. Read, Read Status Register, Product ID Entry, Program Resume are valid commands during a Program Suspend.

4.12 Product Identification

The product identification mode identifies the device and manufacturer as Atmel. It may be accessed by a software operation. For details, see “Operating Modes” on page 21.

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4.13 128-bit Protection Register

The AT49BV640D(T) contains a 128-bit register that can be used for security purposes in system design. The protection register is divided into two 64-bit blocks. The two blocks are designated as block A and block B. The data in block A is non-changeable and is programmed at the factory with a unique number. The data in block B is programmed by the user and can be locked out such that data in the sector cannot be reprogrammed. To program block B in the protection register, the two-bus cycle Program Protection Register command must be used as shown in the “Command Definition Table” on page 15. To lock out block B, the two-bus cycle Lock Protection Register command must be used as shown in the “Command Definition

Table”. Data bit D1 must be zero during the second bus cycle. To determine whether block B

is locked out, use the status of block B protection command. If data bit D1 is zero, block B is locked. If data bit D1 is one, block B can be reprogrammed. Please see the “Protection Regis-

ter Addressing Table” on page 16 for the address locations in the protection register. To read

the protection register, the Product ID Entry command is given followed by a normal read operation from an address within the protection register. After determining whether block B is protected or not, or reading the protection register, the Read command must be given to return to the read mode.

4.14 Common Flash Interface (CFI)

CFI is a published, standardized data structure that may be read from a flash device. CFI allows system software to query the installed device to determine the configurations, various electrical and timing parameters, and functions supported by the device. CFI is used to allow the system to learn how to interface to the flash device most optimally. The two primary benefits of using CFI are ease of upgrading and second source availability. The command to enter the CFI Query mode is a one-bus cycle command which requires writing data 98h to any address. The CFI Query command can be written when the device is ready to read data or can also be written when the part is in the product ID mode. Once in the CFI Query mode, the system can read CFI data at the addresses given in “Common Flash Interface Definition Table”

on page 26. To return to the read mode, the read command should be issued.

AT49BV640D(T)

4.15 Hardware Data Protection

Hardware features protect against inadvertent programs to the AT49BV640D(T) in the following ways: (a) V erase functions are inhibited. (b) V level, the device will automatically time-out 10 ms (typical) before programming. (c) Program inhibit: holding any one of OE inhibit: V

is less than V

4.16 Input Levels

While operating with a 2.65V to 3.6V power supply, the address inputs and control inputs (OE, CE

and WE) may be driven from 0 to 5.5V without adversely affecting the operation of the

device. The I/O lines can be driven from 0 to V

4.17 Output Levels

For the AT49BV640D(T), output high levels are equal to V

3.6V output levels, V

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sense: if VCC is below 1.8V (typical), the device is reset and the program and

power-on delay: once VCC has reached the VCC sense

low, CE high or WE high inhibits program cycles. (d) Program

ILPP

+ 0.6V.

CCQ

- 0.1V (not VCC). For 2.65V to

CCQ

must be tied to VCC.

CCQ

4.18 Word Program Flowchart

Start

Wri te 40,

Any Addr ess

Wr ite D ata,

Wor d Ad dr es s

Read-Status

Regi ster

SR7 =

Full Status

Check

(If Desired)

Progr am

Complete

(Set up)

(Confirm)

Suspend?

Program Suspend

Loop

Ye s

4.19 Word Program Procedure

Bus

Operation Command Comments

Write

Program

Setup

Write Data

Read None

Idle None

Repeat for subsequent Word Program operations. Full status register check can be done after each program, or

after a sequence of program operations. Write FF after the last operation to set to the Read state.

Data = 40 Addr = Any Address

Data = Data to program Addr = Location to program

Status register data: Toggle CE or

to update status register

Check SR7 1 = WSM Ready 0 = WSM Busy

4.20 Full Status Check Flowchart

Read Status

Regi ster

SR3 =

SR4 =

SR1 =

Program

Successful

1 V

Range

Error

Program

Error

Device

Protect Er ror

4.21 Full Status Check Procedure

Bus

Operation Command Comments

Idle None

SR3 MUST be cleared before the Write State Machine allows further program attempts.

If an error is detected, clear the status register before continuing operations – only the Clear Status Register command clears the status register error bits.

Check SR3:

Error

1 = V

Check SR4: 1 = Data Program Error

Check SR1: 1 = Sector locked; operation aborted

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