CS49611X Просмотр технического описания (PDF) - Cirrus Logic

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CS49611X

Digital Audio Networking Processor

Cirrus Logic 

CobraNet Hardware User’s Manual

Host Management Interface (HMI)

7.4 Protocol and Messages

The message conduit is used to issue commands to the CS1810xx/CS4961xx and

retrieve HMI status. The data conduit is used to transfer data dependent on the HMI state

as determined by commands issued by the host via the message conduit.

7.4.1 Messages

Messages are used to efficiently invoke action in the CS1810xx/CS4961xx. To send a

message, the host optionally writes to the A, B, and C registers. Writing to the D register

transmits the message to the CS1810xx/CS4961xx. A listing of all HMI messages is

shown in Table 4. Refer also to "HMI Definitions" on page 33 and "HMI Access Code" on

page 34.

Message

Translate Address

Acknowledge Interrupt

Identify

Goto Packet Transmit

Buffer

Goto Translation

Acknowledge Packet

Receipt

Transmit Packet

Goto Counters

Goto Packet Receive

Buffer

Goto Translation

DRQ Handshake

Mode

n/c

n/c

read

write

write

n/c

n/c

read

read

read

A

B

Address (MS)

n/c

n/c

Address

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

n/c

Table 4. HMI messages

C

D

Address (LS)

n/c

7

6

5

4

3

2

1

0

0xB3

0xB4

0xB5

0xB5

0xB5

0xB5

0xB5

0xB5

0xB5

0xB5

28

©Copyright 2005 Cirrus Logic, Inc.

DS651UM23

Version 2.3

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