APR3SLASHD datasheet(78/101 Pages) NXP

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4-4

DSP56001A/D, Rev. 1

MOTOROLA

DSP56001A

Substituting the DSP56001A for the DSP56001

CONTROL REGISTERS

The OMR and the Status Register on the DSP56001A have been altered from those on the

DSP56001. Refer to Table 4-2 for details of these alterations.

HOST COMMAND VECTOR REGISTER

The DSP56001A’s Host Command Vector Register (CVR) also differs from that of the DSP56001

(see Table 4-3).

Table 4-2

Summary of Control Register Differences

BIT

DSP56001

DEFINITION

DSP56001A

DEFINITION

EXPLAINATION OF

DIFFERENCE

Status Register

Reserved—

Read/Written as

zero.

Reserved—

Read as don’t

care.

On the 001A this bit may be

read as 0 or 1. The user should

not rely on this bit being a

given value.

Reserved—

Read/Written as

zero.

Reserved—

Write as zero

only, read as

don’t care.

If this bit is set on the 56001A,

the operations performed by

the Data ALU change, and

56001 code will yield

erroneous results. Write this bit

only as zero.

Operating Mode

Reserved—

Read/.Written

as zero

Reserved—

Write as zero

only, read as

don’t care.

If this bit is set, memory reads

may be from incorrect

locations. Write this bit only as

zero.

Port B Control

Reserved—

Written as zero.

Reserved—

Written as zero.

Writing this bit as a 1 will result

in behavior differences between

the 001 and the 001A.

Table 4-3

Summary of Host Command Vector Register Differences

BIT

DSP56001

DEFINITION

DSP56001A

DEFINITION

EXPLAINATION OF

DIFFERENCE

Host Command

Vector Register

(CVR)

Reserved—

Read as zero.

Reserved—Read

as don’t care.

This bit should be written with

only a zero on the 56001A.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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