5.1.2. Signal descriptions

Table 5.2 lists the non-AMBA signals used by the external RAM module.

Table 5.2. External RAM module signals

Signal

Type

Direction

Description

A[14:0]

External address

Input

The external address input

CSN

Chip enable

Input

When LOW, this signal indicates that the chip has been selected and must respond to the current transfer

DQ[7:0]

External data I/O

Input/ output

The external data bus, sampled during write transfers and driven during read transfers

OEN

Output enable

Input

When LOW, this signal indicates a read transfer, and enables the module to drive data onto DQ

WEN

Write enable

Input

When LOW, this signal indicates a write transfer

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