VeEX RXT3900, User Manual

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FC-2 Header Format
The Frame Header is the first field of the frame content and immediately follows the SOF delimiter. The Frame Header is used to
control link operations and device protocol transfers as well as detect missing or out of order frames. The values of each field can be
edited depending on network setup and test scenario. A brief description of each parameters is provided below.
FC-2 Header Setup
Routing Control (R_CTL):
The R_CTL field is a one-byte field in Word 0 Bits 31-24 that contains routing bits and information bits to categorize the
frame function.
When used in combination with the TYPE field (Word 2, bits 31-24), it provides an FC_Port with assistance in frame
routing, data routing, or addressing.
The R_CTL field is further subdivided into the ROUTING field (bits 31-28) and the INFORMATION field (bits 27-24).
D_ID Address Identifier:
Destination Identifier is a three-byte field (Word 0, Bits 23-0) that contains the address identifier of the destination
Nx_Port.
Each Nx_Port has a native N_Port_ID that is unique within the address domain of a Fabric. It may also represent hunt
groups, domain controllers, and other servers.
Class Specific Control (CS_CTL)/Priority:
When bit 17 of F_CTL is set to zero, Word 1, bits 31-24 of the Frame_Header is defined as the CS_CTL field.
Contains management information for the class of service identified by the SOF. The meaning of the CS_CTL field is
dependent on the class of service.
When supported by FC_Ports, the Priority field shall be used to resolve resource contention or to determine the order to
deliver frames. The definition and use of the Priority field is class dependent.
RXT-3900 e-Manual D07-00-111P Rev A00