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Dual-Port-Memory 30/112
3.2.2 Status & Error Codes
The following status and error codes can be returned in ulState: List of codes see manual named
netX Dual-Port Memory Interface.
3.2.3 Differences between System and Channel Mailboxes
The mailbox system on netX provides a non-cyclic data transfer channel for field bus and industrial
Ethernet protocols. Another use of the mailbox is allowing access to the firmware running on the netX
chip itself for diagnostic purposes. There is always a send and a receive mailbox. Send and receive
mailboxes utilize handshake bits to synchronize these data or diagnostic packages through the
mailbox. There is a pair of handshake bits for both the send and receive mailbox.
The netX operating system rcX only uses the system mailbox.
• The system mailbox, however, has a mechanism to route packets to a communication
channel.
• A channel mailbox passes packets to its own protocol stack only.
3.2.4 Send Mailbox
The send mailbox area is used by protocols utilizing a non-cyclic data exchange mechanism. Another
use of the mailbox system is to provide access to the firmware running on the netX chip itself. The
send mailbox is used to transfer non-cyclic data to the network or to the protocol stack.
The size is 1596 bytes for the send mailbox in the default memory layout. The mailbox is accompanied
by counters that hold the number of packages that can be accepted.
3.2.5 Receive Mailbox
The receive mailbox area is used by protocols utilizing a non-cyclic data exchange mechanism.
Another use of the mailbox system is to provide access to the firmware running on the netX chip itself.
The receive mailbox is used to transfer non-cyclic data from the network or from the protocol stack.
The size is 1596 bytes for the receive mailbox in the default memory layout. The mailbox is
accompanied by counters that hold the number of waiting packages (for the receive mailbox).
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DOC070901API06EN | Revision 6 | English | 2010-06 | Released | Public © Hilscher, 2006-2010