TMP92FD54AI datasheet(10/84 Pages) TOSHIBA

10 / 84 page

2006-01-27

92FD54AI-10

TMP92FD54AI

4. Functional Description

This section describes the hardware configuration of the TMP92FD54AI and how it

operates. This device is a modified version of the TMP92CD54I with an internal

512K-byte flash memory instead of an internal 512K-byte Mask ROM. These internal

RAM are same size, 32K-byte. In all other respects the hardware configuration and the

functionality of the TMP92FD54AI are identical to those of the TMP92CD54I.

4.1

Flash Memory

4.1.1

Features

1) Memory capacity

TMP92FD54AI contains a 4-Mbit (512K-byte) flash memory. This flash memory

consists of 10 blocks (64 K-bytes × 6 blocks, 56 K-bytes × 2 blocks, 8 K-bytes × 2

blocks), each of which can be independently protected from being programmed or

erased. The CPU accesses the flash memory using a 32-bit wide data bus. A writer

rewrites the flash memory in units of 16 bits.

2) Flash memory access

Interleaved access (2-1-1-1-clock access)

3) Program/erase time

Programming time (including Verify):6 seconds per chip (typ.)

30 µs per long word (typ.)

Erase time (including Verify)

12 seconds per chip (typ.)

Note: The above values are typical times and do not include data transfer time.

The actual time per chip varies according to the method used by the user to perform

rewriting.

4) Programming methods

On-board programming mode, in which the memory can be rewritten while

mounted on the user PCB.

• On-board programming mode

1) User Boot M ode

Supports user-defined rewriting methods.

2) Single B oot M ode

Supports rewriting by serial transfer

(unique to Toshiba).

5) Rewriting method

With a few exceptions, the functions of the device’s internal flash memory conform

to JEDEC standards. Therefore, even if the user system uses flash memory as

external memory, it can easily be adapted to use this LSI. Furthermore, since the

device’s flash memory has built-in circuits which can automatically write to the

flash memory and erase the chip, the user does not have to code a program to

perform the program and erase operations.

The Block Protect function, which inhibits writing to or erasing the flash memory,

only supports software protection (i.e. protection by a command setting), and does

not support hardware protection (i.e. protection by the application of a voltage of

12 V).

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