CS18102X datasheet(32/54 Pages) CIRRUS

32 / 54 page

DS651UM23

Version 2.3

CobraNet Hardware User’s Manual

Host Management Interface (HMI)

7.4.3 Data

Before accessing data, address setup must be performed. Address setup consists of

issuing a

Translate Address request, waiting for the request to complete, then issuing a

Goto Translation.

Pipelining requires that a

“garbage read” be performed following an address change. The

second word read contains the data for the address requested. No similar pipelining issue

exists with respect to write operations.

7.4.3.1. Region length

Distance from the original pointer position (as per

Translate Address) to the end of the

instantiated region. A value of

0 indicates an invalid pointer.

7.4.3.2. Writable Region

When set, this bit indicates the address pointer is positioned within a writable region.

variables may be modified in a writable region by writing data to the data conduit.

7.4.3.3. Translation Complete

When set, this bit indicates that the address translator is available (translation results are

available and a new translation request may be submitted). This bit is cleared when a

Translate Address message is issued and is set when the translation completes.

7.4.3.4. Packet Transmission Complete

This bit is cleared when transmission is initiated by issuance of the

Transmit Packet

message. The bit is set when the packet has been transmitted and the transmit buffer is

ready to accept a new packet.

7.4.3.5. Received Packet Available

This bit is set when a packet is received into the packet bridge. It is cleared when the

packet data is read and receipt is acknowledged by issuance of an

Acknowledge Packet

Receipt message. Note that Received Packet Available only goes low when there are no

longer any pending received packets for the packet bridge. The packet bridge has the

capacity to queue multiple packets in the receive direction.

7.4.3.6. Message Togglebit

This bit toggles on completion of processing of each message. A safe means for the host

to acknowledge processing of messages is as follows:

void WaitToggle( void )

{

int msgack = MSG_D; /* clean pipeline */

msgack = MSG_D; /* record current state of togglebit */

MSG_D = YOUR_COMMAND_HERE; /* issue command */

/* wait for togglebit to flip */

while( !( ( msgack ^ MSG_D ) & ( 1 << MSG_TOGGLE_BO ) ) );

}

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