Ethernet MAC (EMAC) Registers
BCM5718 Programmer’s Guide
Broadcom
®
January 29, 2016 • 5718-PG108-R
Page 327
Low Watermark Maximum Receive Frame Register (offset: 0x504)
APE_PERFECT_MATCH[1–4]_HIGH_REG (Offsets 0x540, 0x548,
0x550, 0x558)
There are total 4 Perfect (Destination Address) Match registers dedicated to APE in RX-MAC. These registers
hold the higher 2 octets of the matching address.
APE_PERFECT_MATCH[1–4]_LOW_REG (Offsets 0x544, 0x54C,
0x554, 0x55C)
There are total 4 Perfect (Destination Address) Match registers dedicated to APE in RX-MAC. These registers
hold the lower 4 octets of the matching address.
SGMII Control Register (offset: 0x5B0)
Name
Bits
Access
Default
Value
Description
Reserved
31:21
RO
0
–
TXFIFO Almost Empty
Threshold
20:16
RW
0xC
When the remaining entries of TXFIFO are less
than this threshold, TXFIFO_almost_empty will
be asserted. This value is used in conjunction
with Buffer Manager Mode register bit31 to
prevent EMAC TXFIFO underrun.
Low Watermark Max Receive
Frames
15:0
RW
0
Specifies the number of good frames to receive
after RX MBUF Low Watermark has been
reached. After the RX MAC receives this number
of frames, it will drop subsequent incoming
frames until the MBUF High Watermark is
reached.
Default to zero (i.e., drop frames ones RX MBUF
Low Watermark is reached).
Name
Bits
Access
Default
Value
Description
Reserved
31:29
RO
000
–
MAC High Address
15:0
RW
0x0000
Upper 2-bytes of APE's [1–4]th unicast address.
Name
Bits
Access
Default
Value
Description
MAC Low Address
31:0
RW
0x0000
Lower 4-bytes of APE's [1–4]th unicast address.
Name
Bits
Access
Default
Value
Description
Reserved
–
–
–
–