DS33Z41 Quad IMUX Ethernet Mapper

8.9.2IMUX Command Protocol

The format for all commands sent and received in Channel 2 of the IBO Serial Interface is shown in Figure 8-5. The MSB for all commands is a “1”. The next 6 bits contain the actual opcode for the command. The LSB is the even parity calculation for the byte. These commands will be sent and received on Channel 2 of each of the T1/E1 interleaved IBO data. The commands that are possible are outlined in Table 8-3. Note that the 4 portions of the IMUX link are separate and the Channel 2 for each link will send and receive commands specific to that link. The microprocessor can disable links that are not to be aggregated.

Figure 8-5. Command Structure for IMUX Function

M

S

B

"1"

L

S

B

Command

Even

Parity

Table 8-3. Commands Sent and Received on the IMUX Links

COMMAND

COMMAND BYTE

TRANSMIT/

COMMENTS

(P IS EVEN

NAME

RECEIVE

PARITY)

 

 

 

 

 

 

 

 

Link Start

1000 001P

Tx or Rx

Initiate the link. The receiver will then search for 3

consecutive sequence numbers.

 

 

 

Sequence

1sss 010P

Tx or Rx

“sss” contains the frame sequence number for

packet segmentation and reassembly.

 

 

 

 

 

 

 

Rsync

1000 011P

Tx or Rx

This command is sent to indicate to the distant

node that link synchronization has been achieved.

 

 

 

 

 

 

 

OOF

1000 100P

Tx or Rx

The transmitting device has detected an out of

frame condition.

 

 

 

Nop

1111 111P

Tx or Rx

No operation.

 

 

 

 

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Maxim DS33Z41 specifications Commands Sent and Received on the Imux Links, Imux Command Protocol, Oof