AN2784

Interfacing with a nonmultiplexed, asynchronous 16-bit NOR Flash memory

Doc ID 14779 Rev 4

13/31

2.3

Hardware connection

Table 4 gives the correspondence between the NOR Flash memory pins and the FSMC pins

and shows the GPIO configuration for each FSMC pin.

In case of an 8-bit NOR Flash memory, the data/address bus is 8-bit wide and D8-D15

should not be connected to the FSMC. The unused FSMC pins can be used for general

purpose I/O.

In case of a synchronous memory, the FSMC_CLK pin should be connected to the memory

clock pin.

Table 4.

M29W128FL signal to FSMC pin correspondence

Figure 5 shows a typical connection between an STM32F10xxx microcontroller and the

M29W128FL NOR Flash memory. It is an abstract from the schematic of the STM3210E-

EVAL (STM32F10xxx evaluation board).

Memory

signals

FSMC

signals

Pin / Port assignment

Pin / Port

configuration

Signal description

A0-A22

A0-A22

Port F/Port G/Port E/Port D AF push-pull

Address A0-A22

DQ0-DQ7

D0-D7

Port D/Port E

AF push-pull

Data D0-D7

DQ8-DQ14

D8-D14

Port D/Port E

AF push-pull

Data D8-D14

DQ15A-1

D15

PD10

AF push-pull

Data D15

E

NE2

PG9

AF push-pull

Chip Enable

G

NOE

PD4

AF push-pull

Output Enable

W

NWE

PD5

AF push-pull

Write Enable