HS_Media independent interface (MII)
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Doc ID 018672 Rev 1
Note:
This bit is not used (reserved) when the Receive FIFO size is less than 4Kbytes.
●
FEF
Setting this bit, all frames except runt-error frames will be forwarded to the DMA.
Otherwise, the Receive FIFO will drop frames with error status.
●
FUF
Setting this bit, the Receive FIFO will forward undersized frames (frames with no error
and length less than 64 bytes, including pad-bytes and CRC). Otherwise, the Receive
FIFO will drop all frames of size less than 64 bytes, unless frame is already transferred
due to lower value of RTC value (in this register).
●
RTC
This 2 bit field allows start of transfer request to DMA when the frame size in the
Receive FIFO is larger than the stated threshold, according to encoding below:
●
OSF
Setting this bit, the DMA is instructed to process a second frame of the Transmit List
even before to obtain the status of the first frame.
●
SR
Setting this bit, the receive process is placed in the Running state, and the DMA
attempts to acquire the descriptor from the Receive List and process incoming frames.
Descriptor acquisition is attempted from the current position (pointed by the Receive
Descriptor List Address register) or at position retained in case of reception was
previously stopped.
Clearing this bit, the receive process is placed in the Stopped state after completing the
transmission of the current frame.
24.7.10 Interrupt
enable
register (Register7, DMA)
The Interrupt Enable is a register which enables the interrupts reported by register5
(
). The Interrupt Enable Bit assignments are given in
Note:
Setting a bit enables the corresponding interrupt. After reset, all interrupts are disabled.
Table 440.
RTC field bit assignments
Value
Threshold (Byte)
2‘b00
64
2‘b01
32
2‘b10
96
2‘011
128
Table 441.
Interrupt enable register bit assignments
Bit
Name
Reset value
Type
Description
[31:17]
Reserved
-
RO
Read: undefined.
[16]
NIE
1’h0
RW
Normal interrupt summary enable.
[15]
AIE
1’h0
RW
Abnormal interrupt summary enable.
[14]
ERE
1’h0
RW
Early receive interrupt enable.