Altera SerialLite II Protocol Bedienungsanleitung PDF herunterladen (Seite 39)

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SerialLite II Protocol Reference Manual

SerialLite II Specification

Figure 2–18. Link Management Packet Encapsulation

Link Management Packet Size

The link management packet has a fixed length of four bytes: a single byte

identifier followed by three bytes of payload.

Link Management Packet Payload Format

Table 2–18 shows the link management packet payload format using the

following parameters:

■ FC_TIME = Flow control time

■ ACK = Acknowledgement

■ NACK = Negative acknowledgement

■ SID = Segment identification

■ BIP-8 = 8 bits of bit interleaved parity

■ CLASS = Packet type class

Link Management Packet Type (LMP[23:20])

SerialLite II currently has the following management packets defined:

■ Flow Control Packets (Link Packet Type = 0x1); see detailed

description in “Flow Control (Optional)” on page 2–61.

■ Retry-on-Error Control Packets (Link Packet Type = 0x2); see

detailed description in “Retry-on-Error (Optional)” on page 2–64.

Link Management Packet Parameter (LMP[19:8])

This field contains parameters specific to the type of link management

packet. See “Flow Control (Optional)” on page 2–61 and “Retry-on-Error

(Optional)” on page 2–64 for details.

SLP Link Management Packet Payload

Table 2–18. Link Management Packet Format

Bits

[23:20] [19:16] [15:12] [11:8] [7:4] [3:0]

Type Parameter Description Protection

Flow control packet 0x1 CLASS FC_TIME BIP-8

Retry-on-error control packet 0x2 CLASS 0x0 SID BIP-8

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 83 84

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Altera SerialLite II Protocol Bedienungsanleitung Seite 39