Achronix Speedster22i 10G/40G/100G Ethernet - Manual (Page 69)

UG029, September 6, 2013 69
17 NO_LGTH_CHECK
Disable Payload Length Check. If set to ‘0’ (Reset value),
the Core checks the frame's payload length with the
frame's Length/Type field. If set to ‘1’, the payload length
check is disabled.
18 RS_COL_CNT_EXT
If set to ‘1’, sets the reconciliation sublayer parameter
col_cnt to the value set in the global register
WAN_RS_COL_CNT.
When disabled (0), the col_cnt is set as defined by the
IEEE 802.3ae standard (128) ignoring the global setting.
19 PFC_MODE
Priority Flow Control Mode. If set to ‘1’, the Core
generates and processes PFC control frames according
to the Priority Flow Control Interface signals. If set to ‘0’
(Reset Value), the Core operates in legacy Pause Frame
mode and generates and processes standard Pause
Frames (See Flow Control Interface on page 45).
20 PAUSE_PFC_COMP
Link Pause Compatibility with PFC Mode. If set to ‘1’,
Pause frames in legacy pause mode are processed
similar to PFC frames in PFC mode, i.e. the transmit
path is not paused by incoming Pause frames, only the
pause status ff_rx_pfc_xoff<n>(0) is asserted as long as
the internal pause timer has not expired. If set to ‘0’
(Reset value). (See Flow Control Interface on page 45).
This bit is relevant only when PFC_MODE=0.
21 RX_SFD_ANY
Enables, when set, that any character is allowed at the
SFD position of the preamble and the frame will be
accepted. Note that when this bit is set, no alignment
error can occur.
If cleared (default) the frame is accepted only if the 8th
byte of the preamble contains the SFD value 0xd5. If
another value is received, the frame is discarded and the
alignment error counter increments.
22 TX_FLUSH
Egress Flush Enable. If set to ‘1’, the Core reads out the
Tx FIFO and drops the data (data is not sent out on the
line). The associated pause signals (link pause or priority
flow control) are masked.
23 to 31 reserved unused