6.1.1. Signal descriptions

Table 6.1 shows the signal descriptions for the external RAM module.

Table 6.1. Signal descriptions for the external RAM module

Signal

Type

Direction

Description

A[14:0]

External address

Input

The external address input.

DQ[7:0]

External data I/O

Input/ output

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

CSn

Chip enable

Input

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

WEn

Write enable

Input

When LOW this signal indicates a write transfer.

OEn

Output enable

Input

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

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