AN2647 datasheet(11/34 Pages) STMICROELECTRONICS

No. de pieza	AN2647

Descripción Electrónicos	Using the STR91xFA external memory interface

PDF	34 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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11 / 34 page

AN2647

Interfacing with asynchronous memory

11/34

1.1.2

Non-multiplexed EMI bus configuration

The 8-bit non-multiplexed bus has a different set of bus signal, port assignment and bus

timing. Table 2 shows the non-multiplexed bus signal pin assignments.

The non-multiplexed bus has 16 address lines and this limits the memory bank size to no

more than 64 KB. Figure 6. shows a typical non-multiplexed bus connection to an 8-bit

Cypress SRAM.

Table 2.

Non-multiplexed bus signals

Figure 6.

Non-multiplexed bus port connection

Read bus cycle timing configuration

Figure 7 shows a typical Read Bus Cycle. All bus timings are referenced to the internal

BCLK clock signal. BCLK clock is only available on an external pin for various usage on the

144 pin BGA package.

Signal name

Pin / Port assignment

Signal description

D0-D7

Port 8

Data bus D0-D7

A0-A7

Port 7

Address A0-A7

A8-A15

Port 9

Address A8-A15

Read

EMI_RDn

Read signal

Write

EMI_BWRn

Write signal, same as EMI_WRLn

CS0-CS3

Port 0(P0.4-P0.7) or

Port 5 (P5.4-P5.7) or

One chip select for each of the 4 Memory

Banks.Can be assigned to any of these two

ports.

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