M69KB128AA datasheet(32/68 Pages) STMICROELECTRONICS

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7 Configuration registers

M69KB128AA

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Table 9.

Bus Configuration Register Definition

Address

Bits

Bus

Configuration

Name

Value

Description

A15

BCR15

Operating Mode

Bit

Synchronous Mode (NOR Flash or Full

Synchronous Mode)

Asynchronous Mode (Default)

A14

BCR14

Latency Type

Variable Latency (Default)

Fixed Latency

A13-A11

BCR13-

BCR11

Latency Counter

Bits

010

3 Clock Cycles

011

4 Clock Cycles (Default)

100

5 Clock Cycles

101

6 Clock Cycles

110

7 Clock Cycles

Other Configurations Reserved(1)

Programming the BCR with reserved value will force the device to use the default register settings.

A10

BCR10

WAIT Polarity Bit

WAIT Active Low

WAIT Active High (default).See Figure 10:

WAIT Polarity.

Must be set to ‘0’ Reserved(1)

BCR8

Wait

Configuration Bit

WAIT Asserted During Delay (see Figure 9:

WAIT Configuration Example).

WAIT Asserted One Clock Cycle Before Delay

(Default)

A7-A6

Must be set to ‘0’ Reserved(1)

A5-A4

BCR5-BCR4

Driver Strength

Bits

Full Drive

1/2 Drive (Default)

1/4 Drive

Reserved(1)

BCR3

Burst Wrap Bit

0Wrap

No Wrap (Default)

A2-A0

BCR2-BCR0

Burst Length Bit

001

4 Words

010

8 Words

011

16 Words

100

32 Words

111

Continuous Burst (default)

Other Configurations Reserved(1)

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