ARMV4T datasheet(16/30 Pages) ACTEL

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CoreMP7

v2.6

Functionality

This section describes the specific functionality of the

ARM7 BFM. The BFM models the ARM7 native bus.

Specifically, this models the following bus signals:

CoreConsole v1.1

ARM7 Pin Compatibility

The BFM model is pin-for-pin compatible with the

ARM7TDMI-S. This allows the model to be dropped into

the space that would be occupied by the ARM in the

Verilog/VHDL system testbench.

ARM7 Bus Cycle Accuracy

The bus cycle timings for the ARM7 native bus signals are

specified in the ARM7TDMI Technical Reference Manual.

The BFM models these bus cycles exactly.

Scripting

In order to provide a simple and extensible mechanism

for providing stimuli to the BFM, a BFM scripting

language is defined (see the "BFM Script Language"

section). The scripting language can initiate writes to

system resources, reads from system resources (with or

without checking of expected data), and can wait for

events.

Self-Checking

The BFM gives a pass/fail indication at the end of a test

run. This is based on whether any of the expected data

read checks failed or not.

Endianess

The BFM supports both big and little-endian memory

configurations. For byte and halfword transfers, it reads

and writes data from/to the appropriate data lanes.

Interrupt Support

The BFM has the ability to wait for either of the two

ARM7 interrupt lines to be triggered, before proceeding

with the remainder of the test script.

Log File Generation

The BFM generates output messages to the console of

the simulation tool and also generates a plain text log

file.

BFM Script Language

The following script commands are defined for use by

the BFM:

memmap

This command is used to associate a label, representing a

system resource, with a memory map location. The other

BFM script commands may perform accesses to locations

within this resource by referencing this label and a

Syntax

memmap resource_name base_address;

resource_name

This is a string containing the user-friendly instance

name of the resource being accessed. For BFM scripts

generated automatically by CoreConsole, this name

corresponds to the instance name of the associated core

in the generated subsystem Verilog or VHDL.

base_address

This is the base address of the resource, in hexadecimal.

write

This command causes the BFM to perform a write to a

specified offset, within the memory map range of a

specified system resource.

Syntax

write width resource_name byte_offset data;

width

This takes on the enumerated values of W, H, or B, for

word, halfword, or byte.

resource_name

This is a string containing the user-friendly instance

name of the resource being accessed, as defined by the

user in the memory map (when input to CoreConsole).

byte_offset

This is the offset from the base of the resource, in bytes.

It is specified as a hexadecimal value.

data

This is the data to be written. It is specified as a

hexadecimal value.

Example

write W videoCodec 20 11223344;

•

ADDR,

// address bus

•

WDATA,

// write data bus

•

RDATA,

// read data bus

•

TRANS,

// next transaction type (i, n, or s)

•

WRITE,

// indicates write access

•

CLKEN,

// clock enable

The BFM also models the following control signals:

•

CFGBIGEND, // big/little endian configuration

•

CLK,

// clock

•

nFIQ,

// interrupt request

•

nIRQ,

// fast interrupt request

•

SIZE,

// memory access width

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