Altera cyclone V Technical Reference page 2069

Hard processor system

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Operation_Mode

Altera Corporation

When set, the Rx FIFO forwards Undersized frames

(frames with no Error and length less than 64 bytes)

including pad-bytes and CRC. When reset, the Rx

FIFO drops all frames of less than 64 bytes, unless a

frame is already transferred because of the lower

value of Receive Threshold, for example, RTC = 01.

These two bits control the threshold level of the MTL

Receive FIFO. Transfer (request) to DMA starts when

the frame size within the MTL Receive FIFO is larger

than the threshold. In addition, full frames with

length less than the threshold are transferred

automatically. These bits are valid only when the RSF

bit is zero, and are ignored when the RSF bit is set to

When this bit is set, it instructs the DMA to process

the second frame of the Transmit data even before the

status for the first frame is obtained.

Drops Frames less than 64Bytes

Forward Frames with no errors

MTL Rcv Fifo threshold level 64

MTL Rcv Fifo threshold level 32

MTL Rcv Fifo threshold level 96

MTL Rcv Fifo threshold level 128

DMA Does Not Process second frame

DMA Processes second frame

Ethernet Media Access Controller

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