CoreMP7

v2.6

13

CoreMP7 Variants

There are two implementations of CoreMP7 (Core Only and Core Plus Debug). The utilization and performance of the

variants are shown in Table 1 on page 2.

Core Plus Debug

The Core Plus Debug variant is configured with all

features of the ARM7TDMI-S. The variant incorporates

the full debug functionality of the ARM7TDMI-S and is

fully compliant with RealView RVDS, RVDK, and other

ARM software debug tools.

Core Only

The Core Only variant has the same features as the Core

Plus Debug variant except that it does not include the

ICE-RT debug block or the TAP controller, which reduces

the size of the core. This means that the standard debug

tools cannot be used with this variant of CoreMP7.

No Debug

This is the most obvious characteristic of the Core Only

variant. To reduce area, the Debug EmbeddedICE-RT

macrocell, the EmbeddedICE-RT TAP controller, and the

scan logic have been optimized out. This means that

standard software debug tools cannot be used when this

variant of the CoreMP7 is instantiated. Users can employ

the Core Plus Debug variant for development, and when

the application has been fully tested and debugged, the

Core Only variant can be instantiated to reduce area in

the final shipping product.

No Coprocessor Interface

The coprocessor interface is a rarely used feature in

ARM7 family microprocessors and has been removed

from CoreMP7 to minimize area.

Little Endian Only

Most microprocessor-based systems use Little Endian

byte ordering. The option of selecting Big Endian has

been removed from CoreMP7 to minimize area.

On-Chip RAM Consumed by Register Block

To minimize the area, the CoreMP7 variants map the

processor register block into on-chip RAM. RAM blocks

used to implement CoreMP7 registers are no longer

available for use in user designs.

Figure 8 •

ARM7 TDMI-S Core

ARM7 CPU

Coprocessor

Signals

Data

Address

Bus Control

Signals

Debug Interface

Debug JTAG

Signals

ARM7TDMI-S Core

Debug

EmbeddedICE-RT

(Debug)

TAP

Controller