STLC2415

12/22

Figure 4. Block Addresses

5.3.1 Flash Signal Descriptions

– Write Protect (nwp)

Write protect is an input that gives an additional hardware protection for each block. When Write Protect

is

≤ 0.4V the Lock-Down is enabled and the protection status of the flash blocks cannot be changed.

When Write Protect is

≥ (vddq - 0.4V), the Lock-Down is disabled and the flash memory blocks can be

locked or unlocked.

– Reset (nrp)

The Reset input provides a hardware reset of the memory. When reset is

≤ 0.4V, the memory is in reset

mode: the outputs are high impedant and the current consumption is minimized. After Reset all blocks

are in Locked state. When Reset is

≥ (vddq - 0.4V), the device is in normal operation. Exiting reset mode

the device enters read array mode, but a negative transition of Chip Enable or a change of the address

is required to ensure valid data outputs.

– Vdd Supply Voltage (vddf)

Vdd provides the power supply to the internal core of the flash memory device. It is the main power sup-

ply for all operations (Read, Program and Erase)

– Vddq Supply Voltage (vddq)

Vddq provides the power supply to the I/O pins and enables all Outputs to be powered independently

from Vddf. Vddq can be tied to Vddf or can use separate supply.

4 KWords

3FFFF

3F000

32 KWords

0FFFF

08000

32 KWords

07FFF

00000

M28R400CT

Top Boot Block Addresses

4 KWords

38FFF

38000

32 KWords

30000

37FFF

Total of 8

4 KWord Blocks

Total of 7

32 KWord Blocks