AT52BR1674 Просмотр технического описания (PDF) - Atmel Corporation

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AT52BR1674

16-megabit Flash and 2-megabit/ 4-megabit SRAM Stack Memory

Atmel Corporation 

16-megabit

Flash

Description

The 16-megabit Flash memory organized as 1,048,576 words of 16 bits each. The x16 data

appears on I/O0 - I/O15. The memory is divided into 39 sectors for erase operations.The

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

reprogrammed using a single 2.7V 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 Sector Lockdown section).

The device is segmented into two memory planes. Reads from memory plane B may be per-

formed even while program or erase functions are being executed in memory plane A and vice

versa. This operation allows improved system performance by not requiring the system to wait

for a program or erase operation to complete before a read is performed. To further increase

the flexibility of the device, it contains an Erase Suspend feature. This feature will put the

erase 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 same memory plane. There is no reason to suspend the

erase operation if the data to be read is in the other memory plane. The end of a program or

an erase cycle is detected by the Ready/Busy pin, Data Polling or by the toggle bit.

The VPP pin provides faster program/erase times. With VPP at 5.0V or 12.0V, the program and

erase operations are accelerated.

A six-byte command (Enter Single Pulse Program Mode) sequence to remove the requirement

of entering the three-byte program sequence is offered to further improve programming time.

After entering the six-byte code, only single pulses on the write control lines are required for

writing into the device. This mode (Single Pulse Word Program) is exited by powering down

the device, or by pulsing the RESET pin low for a minimum of 500 ns and then bringing it back

to VCC. Erase and Erase Suspend/Resume commands will not work while in this mode; if

entered they will result in data being programmed into the device. It is not recommended that

the six-byte code reside in the software of the final product but only exist in external program-

ming code.

4 AT52BR1672(T)/1674(T)

2604B–STKD–09/02

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