Ethernet MAC (EMAC) RegistersBCM5718 Programmer’s Guide
Broadcom®
January 29, 2016 • 5718-PG108-R Page 319
Autopolling Status Register (offset: 0x458)
Transmit MAC Mode Register (offset: 0x45C)
Fast_Clock 0 RW 0 –
Name Bits Access
Default
Value
Description
Reserved 31:1 RO 0 –
Auto-polling Error 0 W2C 0 Indicates an autopolling error occurred, if set.
Name Bits Access
Default
Value
Description
RR Weight 31:27 RW 00000 This field may be programmed to assign a weight
to the “Weighted Round Robin” arbitration mode.
This field is applicable only when the appropriate
arbitration mode is chosen, i.e., [19:17] of this
register is equal to “001”.
Transmit FTQ Arbitration Mode 26:24 RW 000 This field determines the arbitration mode of the
TCE block among LAN traffic and APE traffic as
below:
000–Simple Round Robin
001–Weighted Round Robin
010–Shut off APE transmit stream
011–Shut off LAN transmit stream
1xx–Reserved for future use
Caution: This field must remain static following
boot.
HTX2B Count Down Mode 23 RW 0 When this bit is 0:
If there is an HTX2B packet to be enqueued to
the HTX2B, FIFO. However, if the FIFO does not
have sufficient space, TCE drops the copy of the
HTX2B-bound packet and moves on.
When this bit is 1:
If there is an HTX2B packet to be enqueued to
the HTX2B, FIFO. However, if the FIFO does not
appear to have sufficient space at the first
attempt, TCE counts down a few clocks, then
makes a second attempt. If the FIFO still does
not have sufficient space, TCE simply drops the
copy of the HTX2B-bound packet and moves on.
The number of clocks to count-down is
programmable at register 0x464[31:24].
Name Bits Access
Default
Value
Description
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