9

AT49BV160C(T)

3367D–FLASH–5/04

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 sector B is protected or not, or reading the protection register, the Read command

must be given to return to the read mode.

CFI: Common Flash Interface (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 deter-

mine 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 Table 4

on page 25. To return to the read mode, issue the Read command.

HARDWARE DATA PROTECTION: The Hardware Data Protection feature protects against

inadvertent programs to the AT49BV160C(T) in the following ways: (a) V

below 1.8V (typical), the program function is inhibited. (b) V

reached the V

gramming. (c) Program inhibit: holding any one of OE low, CE high or WE high inhibits

program cycles. (d) Program inhibit: V

has reached 0.9V, program and erase operations are inhibited for 100 ns.

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 only be driven from 0 to V

OUTPUT LEVELS: For the AT49BV160C(T), output high levels (V

(not V

els, V

minimum power).