Altera Avalon Tri-State Conduit Components Manual de usuario descargar pdf (Pagina 14)

3–2 Chapter 3: Tri-State Conduit Pin Sharer

Parameters

Avalon Tri-State Conduit Components User Guide May 2011 Altera Corporation

Preliminary

Parameters

The parameter editor for the Tri-State Conduit Pin Sharer allows you to specify a

single parameter, the Number of Interfaces. This parameter specifies the number of

controllers that connect to the Tri-State Conduit Pin Sharer.

Complete the following steps to specify shared pins among connected controllers:

1. Add the Tri-State Conduit Pin Sharer to your Qsys design, specifying the number

of interfaces that connect to it.

2. In the Qsys Connections column, connect the tri-state conduit controllers to the

Tri-State Conduit Pin Sharer.

3. The Tri-State Conduit Pin Sharer parameter editor has a table with the following

columns: Interface, Signal Role, Signal Type, Signal Width, and Shared Signal

Name. To share a signal, type values in the Interface, Signal Role, and Shared

Signal Name columns for all controllers that share that signal.

4. You can use the Update Interface Table button to automatically populate these

values. Figure 3–2 shows that the CFI_Flash memory and IDT_SRAM memory

share the

address

signal.

Signal Behavior During Reset

At power-on reset, the enables for all bidirectional and tri-state output signals are

disabled. Figure 3–3 shows the logic that controls these signals.

Figure 3–2. Specifying Shared Signals Using the Tri-State Conduit Pin Sharer

Figure 3–3. Control of Bidirectional and Tri-State Output Signals

clock

data_out

data_in

data_outen

reset

clock

write_out

reset

1 2 ... 9 10 11 12 13 14 15 16 17 18

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Altera Avalon Tri-State Conduit Components Manual de usuario Pagina 14