MSC8113 Reference Manual, Rev. 0
25-88
Freescale Semiconductor
Ethernet Controller
Table 25-61. HAFDUPR Bit Descriptions
Bit
Reset
Description
Settings
—
0–7
0
Reserved. Write to zero for future compatibility.
ABEBT
8–11
0101
Alternate Binary Exponential Back-off Truncation
In use while ABEB is set. The value programmed is substituted
for the Ethernet standard value of ten. The default is 0xA.
ABEB
12
0
Alternate Binary Exponential Back-off Enable
Configures the Tx MAC to use the alternate binary exponential
back-off truncation (ABEBT) setting instead of the 802.3
standard tenth collision. The standard specifies that any
collision after the tenth uses one less than 210 as the
maximum back-off time.
0
Tx MAC follows the binary
exponential back-off rule.
1
Tx MAC uses alternate binary
exponential back-off rule.
BPNB
13
0
Back Pressure No Back-off
Configures the Tx MAC to retransmit the data immediately
after a collision, during a back pressure operation.
0
Tx MAC follows the binary
exponential back-off rule.
1
No back-off during a back
pressure operation.
NB
14
0
No Back-off
Configures the Tx MAC to immediately re-transmit following a
collision.
0
Tx MAC follows the binary
exponential back-off rule.
1
No back-off.
ED
15
1
Excess Defer
Configures the Tx MAC to allow the transmission of a packet
that is excessively deferred.
0
Abort an excessively deferred
packet.
1
Transmit an excessively
deferred packet.
RTXM
16–19
1111
Retransmission Maximum
This programmable field specifies the number of
retransmission attempts following a collision before the packet
is aborted due to excessive collisions. The standard specifies
the attempt limit to be 0xF (15d).
—
20–25
0
Reserved. Write to zero for future compatibility.
CW
26–31
110111
Collision Window
This programmable field represents the slot time or collision
window during which collisions occur in properly configured
networks. Because the collision window starts at the beginning
of transmission, the preamble and SFD are included. Its
default of 0x37 (55d) corresponds to the count of frame bytes
at the end of the window.
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...