RM0082
HS_Media independent interface (MII)
Doc ID 018672 Rev 1
531/844
Note:
This field is used only when SF bit in this register is cleared.
●
ST
Setting this bit, the transmission process is placed in the Running state, and the DMA
checks the Transmit List for a frame to be transmitted either at the current position
(pointed by the Transmit Descriptor List Address register,
) or at position
retained in case of transmission was stopped previously.
Clearing this bit, the transmission process is placed in the Stopped state after
completing the transmission of the current frame.
●
RFD
This 2 bit field controls the threshold (that is, fill-level of Receive FIFO) at which the
flow-control (in both HD and FD) is de-asserted after activation, according to encoding
below:
●
RFA
This 2 bit field controls the threshold (that is, fill-level of Receive FIFO) at which the
flow-control (in both HD and FD) is activated, according to encoding below:
Note:
This threshold is applicable only for Receive FIFO of size of 4Kbytes and above, and when
bit EFC in this register is set.
●
EFC
Setting this bit, the flow-control operation based on fill-level (threshold) of Receive FIFO
is enabled.
3‘b110
24
3‘b111
16
Table 437.
TTC field bit assignments (continued)
Value
Threshold (Byte)
Table 438.
RFD field bit assignments
Value
Threshold
2‘b00
(Full - 1K) bytes
2‘b01
(Full - 2K) bytes
2‘b10
(Full - 3K) bytes
2‘011
(Full - 4K) bytes
Table 439.
RFA field bit assignments
Value
Threshold
2‘b00
(Full - 1K) bytes
2‘b01
(Full - 2K) bytes
2‘b10
(Full - 3K) bytes
2‘011
(Full - 4K) bytes