By Anderson D.
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Extra resources for Hypertransport system architecture
Sample text
Figure 2-15. Example Protocol Receiving Data from Target The basic rules for maintaining high performance of HT reads include: • For reads, the requester won't issue the request until it has buffers available to receive all requested data without wait states. • The requester won't issue the request until it knows the target has room in its transaction queue to accept it (Flow Control) • Upon receiving the read request, the target won't issue the read response until it has all requested data and status available to send.
Multiplexed signals that carry control packets (request, response, information) and data packets. Note that the width of the CAD bus is scalable from 2-bits to 32-bits. ) • CLK (clock). Source-synchronous clock for CAD and CTL signals. A separate clock signal is required for each byte lane supported by the link. Thus, the number of CLK signals required is directly proportional to the number of bytes that can be transferred across the link at one time. • CTL (control). Indicates whether a control packet or data packet is currently being delivered via the CAD signals.
Figure 4-4. Four Byte Packet On A 32-Bit Interface Part Two: HyperTransport Core Topics 63 64 Part Two: HyperTransport Core Topics A reminder: Because all HyperTransport packets are multiples of 4 bytes, bits of packet information always divide evenly into the available bus width. There never is a need to "pad" unused bit lanes. [ Team LiB ] [ Team LiB ] The Two Packet Types: Control And Data Packets moving across links fall into two groups: control packets and data packets. Control packet types are further divided into three additional classes: Information, Request, and Response.
Hypertransport system architecture by Anderson D.
by Richard
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