Protocol And Messages; Messages - Cirrus Logic CobraNet Silicon Series Hardware User Manual

CobraNet Hardware User's Manual
Host Management Interface (HMI)
7.3

Protocol and Messages

The message conduit is used to issue commands to the CS181xx 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.

7.3.1 Messages

Messages are used to efficiently invoke action in the CS181xx. 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 CS181xx. A listing of all HMI messages is shown in
"HMI Definitions" on page 31
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
26
and
DRQ Handshake
Mode
n/c Address (MS)
n/c n/c
read n/c
write n/c
write n/c
n/c n/c
n/c n/c
read n/c
read n/c
read n/c
Table 4. HMI messages
©
Copyright 2004 Cirrus Logic, Inc.
"HMI Access Code" on page
A B
Address
n/c
n/c
n/c
n/c
n/c
n/c
n/c
n/c
n/c
Table 4. Refer also to
32.
C D
Address (LS) 0xB3
n/c 0xB4
7 0xB5
6 0xB5
5 0xB5
4 0xB5
3 0xB5
2 0xB5
1 0xB5
0 0xB5
DS651UM21
Version 2.1