Maxim-integrated 78Q8430 Software Driver Manual de usuario descargar pdf (Pagina 33)

UG_8430_004 78Q8430 Software Driver Development Guidelines

Rev. 1.0 33

Data Mask 0xFF

Previous Hit Match 0x7B

Previous Hit Mask 0x7F

Byte Offset 0x01 (to skip over the TTL field and look at Protocol)

Interrupt Retain default: 0

Control Logic Action NOP

RCR

Match Control MD

STEP 4: Set CAM rule 0x79 to verify the protocol is ICMP.

Reg. Field Value to write

CAR ADDR 0x79

Data Match 0x01

Data Mask 0xFF

Previous Hit Match 0x7A

RMR

Previous Hit Mask 0x7F

Byte Offset 0x3F (to skip over the IP header)

Interrupt Retain default: 0

Control Logic Action NOP

RCR

Match Control MD

STEP 5: Set rule 0x78 to verify the ICMP type is echo request.

Reg. Field Value to write

CAR ADDR 0x78

Data Match 0x08

Data Mask 0xFF

Previous Hit Match 0x79

RMR

Previous Hit Mask 0x7F

Byte Offset 0x00

Interrupt Retain default: 0

Control Logic Action NOP

RCR

Match Control DONE

Process the ICMP Echo Reply

Use the following procedure to transmit an ICMP echo reply in response to an ICMP echo request:

STEP 1: Check that the classification result is 0x78.

The RPSR Classification field value is 0x78 when the frame is an ICMP echo request.

STEP 2: Read the QUE 0 QLFR to obtain the BLOCK number for the ICMP echo request frame.

When the ICMP request is the next frame in the receive QUE, the QUE 0 QFLR First field contains

the BLOCK number of the frame.

STEP 3: Configure SNOOP to access the ICMP request frame.

Write the value contained in the QFLR First field to the SNCR BLOCK field to configure the SNOOP

interface to access the ICMP frame.

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Maxim-integrated 78Q8430 Software Driver Manual de usuario Pagina 33

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