SLIMbus - Data Channel Transport Protocols and Flow Control

Data Channel Transport Protocols and Flow Control

A Data Channel has exactly one data source at a time and may have one or more data sinks depending upon the Transport Protocol used in the channel.

Flow Control in the Channel, if needed, depends on the Devices and the type of Data involved. TAG bits are used to carry the flow control information.

SLIMbus Device Ports are associated with Data Channels using appropriate channel connection and dis-connection Messages. For data flow between Ports attached to Channels, SLIMbus supports a small group of frequently used Transport Protocols (including a User Defined Transport Protocol) which define data flow type, flow control mechanism, and a side-channel (if any) for any additional application-specific information. A summary of the Transport Protocols is shown in Table 1.

TP
Protocol Name
Type
# of TAG field Slots
0 Isochronous Multicast
0
1 Pushed Multicast
1
2 Pulled Unicast
1
3 Locked Multicast
0
4 Asynchronous – Simplex Unicast
1
5 Asynchronous – Half-duplex Unicast
1
6 Extended Asynchronous – Simplex Unicast
2
7 Extended Asynchronous – Half duplex Unicast
2
8 to 13 Reserved
-
-
14 User Defined 1
-
1
15 User Defined 2
-
2

TABLE 1: SLIMbus Supported Transport Protocols

User 1 & 2 protocols are used to extend SLIMbus's data transmission mechanisms and it is assumed that a Device connected to a User Protocol Data Channel knows the definition of the TAG and AUX bits and how they are used.

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