Altera cyclone V Technical Reference page 1364

cv_5v4
2016.10.28
Bit
7:6
pcf
5
dbf
Ethernet Media Access Controller
Send Feedback
Name
These bits control the forwarding of all control frames
(including unicast and multicast PAUSE frames). * 00:
MAC filters all control frames from reaching the
application. * 01: MAC forwards all control frames
except PAUSE control frames to application even if
they fail the Address filter. * 10: MAC forwards all
control frames to application even if they fail the
Address Filter. * 11: MAC forwards control frames
that pass the Address Filter. The following conditions
should be true for the PAUSE control frames
processing: * Condition 1: The MAC is in the full-
duplex mode and flow control is enabled by setting Bit
2 (RFE) of Register 6 (Flow Control Register) to 1. *
Condition 2: The destination address (DA) of the
received frame matches the special multicast address
or the MAC Address 0 when Bit 3 (UP) of the Register
6 (Flow Control Register) is set. * Condition 3: The
Type field of the received frame is 0x8808 and the
OPCODE field is 0x0001. This field should be set to 01
only when the Condition 1 is true, that is, the MAC is
programmed to operate in the full-duplex mode and
the RFE bit is enabled. Otherwise, the PAUSE frame
filtering may be inconsistent. When Condition 1 is
false, the PAUSE frames are considered as generic
control frames. Therefore, to pass all control frames
(including PAUSE control frames) when the full-
duplex mode and flow control is not enabled, you
should set the PCF field to 10 or 11 (as required by the
application).
Value
0x0 MAC filters all control frames
0x1 MAC forwards all control frames except
PAUSE
0x2 MAC forwards all control frames fail addrflt
0x3 MAC forwards control frames that pass
addrflt
When this bit is set, the AFM block filters all
incoming broadcast frames. In addition, it overrides
all other filter settings. When this bit is reset, the AFM
block passes all received broadcast frames.
Value
0x0
0x1
Description
Description
Description
Pass All Broadcast Frames
Filter All Broadcast Frames
17-149
MAC_Frame_Filter
Access Reset
RW 0x0
RW 0x0
Altera Corporation