Altera RapidIO MegaCore Function Manual do Utilizador descarregar pdf (Página 76)

4–30 Chapter 4: Functional Description

Logical Layer Modules

RapidIO MegaCore Function August 2014 Altera Corporation

User Guide

■

config_offset

is generated by using the values programmed in the

Maintenance

Address

Translation

Window

registers, as described in Table 6–28

through Table 6–35.

■

wdptr

Each window is enabled if the window enable (

WEN

) bit of the

Tx Maintenance

Window

Mask

following registers:

■ A base register:

Maintenance

Mapping

Window

Base

(Table 6–29 on page 6–18)

■ A mask register:

Maintenance

Mapping

Window

Mask

(Table 6–30)

■ An offset register:

Maintenance

Mapping

Window

Offset

(Table 6–31)

■ A control register:

Maintenance

Mapping

Window

Control

(Table 6–32)

For each defined and enabled window, the Avalon-MM address's least significant bits

are masked out by the window mask and the resulting address is compared to the

window base. If the addresses match,

config_offset

is created based on the

following equation:

(mnt_s_address[23:1]

mask[25:3])

base[25:3]

then

config_offset

(offset[23:3]

mask[23:3])

(mnt_s_address[21:1]

~mask

[23:3])

where:

■

mnt_s_address[23:0]

is the Avalon-MM slave interface address

■

config_offset[20:0]

is the outgoing RapidIO register double-word offset

■

base[31:0]

is the base address register

■

mask[31:0]

is the mask register

■

offset[23:0]

is the window offset register

If the address matches multiple windows, the lowest number window register set is

used.

The following fields are inserted from the control register of the mapping window

that matches.

■

prio

■

dest_id

■

hop_count

The

value is determined by your selection of device ID width at the time you create

this RapidIO IP core variation. The

source_tid

is generated internally and the

wdptr

is assigned the negation of

mnt_s_address[0]

For a

MAINTENANCE

Avalon-MM slave write, the value on the

mnt_s_writedata[31:0]

bus is inserted in the

payload

field of the

MAINTENANCE

write packet.

Maintenance Master Processor

This module performs the following tasks:

■ For a

MAINTENANCE

read, converts the received request packet to an Avalon read

and presents it across the Maintenance Avalon-MM master interface.

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