AT697E datasheet(42/154 Pages) ATMEL

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AT697

4226G–AERO–05/09

Write Protection

Read and write protections are provided to prevent accidental accesses to I/O area.

Protection is controlled through the I/O protection ‘iop’ bit from the memory configuration

Bus width

To support applications with low memory and performance requirements, I/O area can

be configured for 8-bit operations. The configuration of I/O in 8-bit mode is done pro-

gramming the I/O bus width field in he memory configuration registers MCFG1.

In such configuration, I/O device is not accessed by multiple 8-bit accesses as other

memory areas. Only one single access is performed

When the I/O bus is configured as an 8-bit wide bus, data 31 downto 24 shall be used as

interface.

Figure 26. I/O 8-bit bus width connection

In addition to the 8-bit mode, the I/O area can be configured for 16-bit accesses. In such

configuration, I/O device is not accessed by multiple 8-bit accesses as other memory

areas. Only one single access is performed.

When the bus is configured as an 16-bit wide bus, data 31 downto 16 shall be used as

interface.

Figure 27. I/O 16-bit bus width connection

Access Error

An access error can be indicated to the processor asserting the BEXC* signal. If

enabled by setting logical one the BEXC* bit in the memory configuration register 1, the

BEXC* signal is sampled with the data.

•

Trap 0x01 is taken if an instruction fetch is in progress

•

Trap 0x09 is taken if a data space is in progress

•

Trap 0x2B is taken if a data store is in progress

Error Management -

EDAC

Overview

The AT697 processor implements an on-chip error detector and corrector (EDAC). The

on-chip memory EDAC can correct one error in a 32-bit word and detect two errors in a

32-bit word. The processor EDAC implemention enables data correction on-the-fly so

that no timing penalty occurs during correction.

OE*

AT697

A[27:0]

D[31:24]

A[27:0]

WRITE*

IOS*

OE*

AT697

A[27:0]

D[31:16]

A[27:0]

WRITE*

IOS*

AT697E Datasheet(PDF) 42 Page - ATMEL Corporation

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