Interrupt Type Codes

The error status bits are only relevant for some adapter check failure codes, as indicated by the following table:

Table 4±3. Relevance of Error Status Bits for Adapter Check Failure Codes

Bit

Name

Channel

List/Data

Receive/Transmit

Read/Write

01h

DataPar

Y

Y

Y

Y

02h

AdrsPar

N

N

N

N

03h

Mabort

Y

Y

Y

Y

04h

Tabort

Y

Y

Y

Y

05h

ListErr

Y

N

Y

N

06h

AckErr

Y

EOC/EOF

Y

N

07h

IovErr

Y

EOC/EOF

Y

N

 

 

 

 

 

 

The first four adapter check codes (0x01 thru 0x04) are due to errors in the hardware. They include parity errors and PCI cycles aborted. These adapter checks reveal serious hardware errors; please verify that the attached hard- ware is correct.

The next three adapter check codes (0x05 through 0x07) are due to inconsis- tencies between ThunderLAN and the driver. These include errors in the lists where the frame size given to ThunderLAN does not match the actual frame size. They also include instances where the driver and ThunderLAN do not agree on how many EOFs to acknowledge. This is a serious mistake, since it means that frames have been lost. These adapter checks show faults in the driver-hardware interaction that must be resolved.

4.4.9Rx EOC Interrupt. Int_type = 111b

A Rx EOC occurs when ThunderLAN encounters a forward pointer of 0 in the receive list chain. A 0 forward pointer is an indication that a receive buffer is not available, and ThunderLAN shuts off the receive process. There is a poten- tial for frame loss if an Rx EOC occurs when the receive channel is stopped, so this condition must be avoided or the channel restarted as soon as possible using the following steps:

-Move the pointer to the top of the Rx list and find it's physical address.

-Write it to the CH_PARM register.

-In the HOST_CMD register, acknowledge the Rx EOC and give the Rx GO command in the same 32-bit move.

Interrupt Handling

4-13

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Texas Instruments TNETE100A, TNETE211 Rx EOC Interrupt. Inttype = 111b, Bit Name Channel List/Data, Eoc/Eof, 07h IovErr
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TNETE110A, TNETE211, TNETE100A specifications

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