Translate Address; Interrupt Acknowledge; Goto Packet; Goto Translation - Cirrus Logic CobraNet Silicon Series Hardware User Manual

7.3.1.1. Translate Address

Translate Address does not actually update the address pointers but initiates the
processing required to eventually move them. The host can accomplish other tasks,
including HMI Reads and Writes while the address translation is being processed. A
logical description of Translate Address is given below. A contextual use of the Translate
Address operation is shown in the reference implementations. Refer also to
Definitions" on page 31
void TranslateAddress(
long address )
{
int msgack = MSG_D;
MSG_A = ( address & 0xff0000 ) >> 16;
MSG_B = ( address & 0xff00 ) >> 8;
MSG_C = address & 0xff;
MSG_D = CVR_TRANSLATE_ADDRESS;
while( !( ( msgack ^ MSG_D ) & ( 1 << MSG_TOGGLE_BO ) ) );
}

7.3.1.2. Interrupt Acknowledge

Causes HACK to be de-asserted.
void InterruptAck( void )
{
int msgack = MSG_D;
MSG_D = CVR_INTERRUPT_ACK;
while( !( ( msgack ^ MSG_D ) & ( 1 << MSG_TOGGLE_BO ) ) );
}

7.3.1.3. Goto Packet

Moves HMI pointers to bridgeRxPktBuffer (write = 0) or bridgeTxPktBuffer (write = 1).
void GotoPacket(
bool write )
{
int msgack = MSG_D;
MSG_C = write ? MOP_GOTO_PACKET_TRANSMIT : MOP_GOTO_PACKET_RECEIVE;
MSG_D = CVR_MULTIPLEX_OP;
while( !( ( msgack ^ MSG_D ) & ( 1 << MSG_TOGGLE_BO ) ) );
}

7.3.1.4. Goto Translation

Moves HMI data pointers to the results of the most recently completed translate address
operation. The write parameter dictates the operation of the HREQ signal and only needs
to be supplied for applications using hardware data handshaking via this signal.
void GotoTranslation(
bool write = 0 )
{
int msgack = MSG_D;
MSG_C = write ? MOP_GOTO_TRANSLATION_WRITE : MOP_GOTO_TRANSLATION_READ;
MSG_D = CVR_MULTIPLEX_OP;
while( !( ( msgack ^ MSG_D ) & ( 1 << MSG_TOGGLE_BO ) ) );
}
DS651UM21
Version 2.1
and "HMI Access Code" on page
©
Copyright 2004 Cirrus Logic, Inc.
CobraNet Hardware User's Manual
Host Management Interface (HMI)
"HMI
32.
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