Achronix Speedster22i 10G/40G/100G Ethernet - Manual (Page 68)

68 UG029, September 6, 2013
7 PAUSE_FWD
Terminate / Forward Pause Frames. If set to '1', pause
frames are forwarded to the user application. If set to '0'
(Reset value), pause frames are terminated and
discarded within the MAC.
8 PAUSE_IGNORE
Ignore Pause Frame Quanta. If set to '1', received pause
frames are ignored by the MAC. If set to '0' (Reset
value), the transmit process is stopped for the amount of
time specified in the pause quanta received within a
pause frame.
This bit is relevant only when PFC_MODE=0.
9 TX_ADDR_INS
Set Source MAC Address on Transmit. If set to '1', the
MAC overwrites the source MAC address received from
the client interface with the MAC address programmed in
registers MAC_ADDR_0 and MAC_ADDR_1 . If set to '0'
(Reset value), the source MAC address from the client
interface is transmitted unmodified to the line.
10 LOOPBACK_EN
Enable PHY Interface Loopback. If set to '1', the signal
loop_ena<n> is set to '1'. If set to '0' (Reset value), the
signal loop_ena<n> is set to '0'.
11 TX_PAD_EN
Enable Transmit Padding. If set to '1' (Reset value), the
MAC transmit logic inserts padding bytes to always
generate frames with a minimum length of 64 bytes with
CRC or 60 bytes without CRC. If set to '0', the MAC
transmit logic can send unpadded frames.
Note: If TX_PAD_EN=0 in 40G and 100G mode of
operation, the MAC does not insert padding bytes for
frames equal or larger than 32 bytes, frames smaller
than 32 bytes are always padded. If TX_PAD_EN=0 in
10G mode of operation, the MAC can send short
unpadded frames of any size.
12 SW_RESET
Self-Clearing Software Reset. When written with '1', all
Statistics Counters are reset to 0.
13 CMD_FRAME_ENA
Enable Reception of all Command Frames. If set to '1',
all command frames are accepted. If set to '0' (Reset
Value), only Pause frames are accepted and all other
command frames are rejected.
A command or control frame is defined as having a MAC
address of 01-80-c2-00-00-01 and type of 0x8808 and
an opcode field that does not match the pause opcode.
14 RX_ERR_DISC
Enable Receive Errored Frame Discard. If set to ‘1’, any
frame received with an error is discarded in the Core and
not forwarded to the client interface. If set to ‘0’ (Reset
value), errored frames are forwarded to the client
interface with ff_rx_err asserted.
Note: Not available in this implementation.
15 PHY_TXENA
Enable PHY Transmit. If set to '1', the signal
phy_txena<n> is set to '1'. If set to '0' (Reset value),
the signal phy_txena<n> is set to '0'.
16 SEND_IDLE
Force Idle Generation. If set to '1', the MAC permanently
sends XL/CGMII Idle sequences even when faults are
received.