MCP MEMORY

K5A3x40YT(B)C

Revision 0.0

November 2002

- 11 -

Preliminary

Flash DEVICE OPERATION

Byte/Word Mode

, the device is in byte mode, DQ0-DQ7 are active. DQ8-DQ14 are in the High-Z state and DQ15 ball is used as an input for the LSB

(A-1) address ball.

Read Mode

is high, the data stored at the specified address location,will be the output of the device. The outputs are in high impedance state

Standby Mode

Flash memory features Stand-by Mode to reduce power consumption. This mode puts the device on hold when the device is dese-

Output Disable

Automatic Sleep Mode

Flash memory features Automatic Sleep Mode to minimize the device power consumption. Since the device typically draws 5

µA of

current in Automatic Sleep Mode, this feature plays an extremely important role in battery-powered applications. When addresses

and always available to the system. When addresses are changed, the device provides new data without wait time.

Data

Outputs

Data

Auto Sleep Mode

Address

Data

Data

Data

Data

Autoselect Mode

Flash memory offers the Autoselect Mode to identify manufacturer and device type by reading a binary code. The Autoselect Mode

allows programming equipment to automatically match the device to be programmed with its corresponding programming algorithm.

In addition, this mode allows the verification of the status of write protected blocks. The manufacturer and device code can be read

via the command register. The Command Sequence is shown in Table 5 and Figure 3. The autoselect operation of block protect ver-

ification is initiated by first writing two unlock cycle. The third cycle must contain the bank address and autoselect command (90H). If

Block address while (A6, A1, A0) = (0,1,0) is finally asserted on the address ball, it will produce a logical "1" at the device output DQ0

to indicate a write protected block or a logical "0" at the device output DQ0 to indicate a write unprotected block. To terminate the

autoselect operation, write Reset command (F0H) into the command register.

Figure 2. Auto Sleep Mode Operation