oDefault: 8, corresponding to 32 bytes or 8 dwords in the receive FIFO.

oNormal Behavior: No message will be displayed. The driver will use the specified value to configure.

oPossible Errors: If the RXFIFO parameter is set to an invalid value, the parameter is ignored and the default value is used, and a message indicates a "Parameter value out of range" error.

•TXFIFO

oSyntax: TXFIFO=[0..15 0x0..0xF]

oExample: TXFIFO=8

oDefault: 8, corresponding to 32 bytes or 8 dwords in the transmit FIFO.

oNormal Behavior: No message will be displayed. The driver will use the specified value to configure.

oPossible Errors: If the TXFIFO parameter is set to an invalid value, the parameter is ignored and the default value is used, and a message indicates a "Parameter value out of range" error.

•TXTHRESHOLD

oSyntax: TXTHRESHOLD=[0..254 0x0..0xFE]

oExample: TXTHRESHOLD=32

oDefault: 32, corresponding to 32 * 8=256 bytes

oNormal Behavior: The value will be set in every transmit command. The initial value can only be changed at load time, although the driver will increase the value if underruns are detected. Setting a low value (less than 16) in high bus latency systems could cause excessive TX DMA underruns, reducing throughput until the driver reacts. Setting a value of more than 200 completely eliminates the possibility of TX DMA underruns.

oPossible Errors:

If the TXTHRESHOLD parameter is set to an invalid value, the parameter is ignored and the default value is used, and a message indicates a "Parameter value out of range" error.

•IFS

oSyntax: IFS=[0..255 0x0..0xFF]

oExample: IFS=16

oDefault: 0 (minimum spacing between frames)

oNormal Behavior: The value will be used to configure the 82557 at initialization time. A value of 0 implies minimum IFS between 2 transmit frames. Increasing the value reduces the probability of collisions under heavy load due to multiple clients, but will have a negative impact on transmit throughput in a point-to-point single-client packet burst.

oPossible Errors: If the IFS parameter is set to an invalid value, the parameter is ignored and the default value is used, and a message indicates a "Parameter value out of range" error.

•RXDMACOUNT

oSyntax: RXDMACOUNT=[0..127 0x0..0x7F]

oExample: RXDMACOUNT=16

oDefault: 0 implying that the Rx DMA will continue until it is done. No other DMA request can preempt it.

Adapter configurations 84