FLASH MEMORY

K8D1716UTC / K8D1716UBC

Revision 1.0

December 2004

10

DEVICE OPERATION

Byte/Word Mode

If the BYTE pin is set at logical "1" , the device is in word mode, DQ0-DQ15 are active. Otherwise the BYTE pin is set at logical "0" ,

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

(A-1) address pin.

Read Mode

The K8D1716U is controlled by Chip Enable (CE), Output Enable (OE) and Write Enable (WE). When CE and OE are low and WE

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

whenever CE or OE is high.

Standby Mode

The K8D1716U 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

K8D1716U features Automatic Sleep Mode to minimize the device power consumption. Since the device typically draws 5

µA of the

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

Figure 1. Auto Sleep Mode Operation

Autoselect Mode

The K8D1716U 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. This mode is used by two method. The one is high

asserted, the device outputs the valid data via DQ pins(see Table 9 and Figure 2). The rest of addresses except A0, A1 and A6 are

Don

The manufacturer and device code may also be read via the command register. The Command Sequence is shown in Table 8 and

Figure 3. The autoselect operation of block protect verification is initiated by first writing two unlock cycle. The third cycle must con-

tain the bank address and autoselect command (90H). If Block address while (A6, A1, A0) = (0,1,0) is finally asserted on the address

pin, 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.