K60P100M100SF2RM Datasheet, PDF (1161/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 44 10/100-Mbps Ethernet MAC (ENET)
44.3.28 Transmit FIFO Almost Full Threshold (ENET_TAFL)
Address: ENET_TAFL is 400C_0000h base + 1A8h offset = 400C_01A8h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
W
TX_ALMOST_FULL
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
ENET_TAFL field descriptions
Field
31–8
Reserved
7–0
TX_ALMOST_
FULL
Description
This read-only field is reserved and always has the value zero.
Value of the transmit FIFO almost full threshold
Value, in 64-bit words, of the transmit FIFO almost full threshold. A minimum value of six is required A
recommended value of at least 8 should be set allowing a latency of two clock cycles to the application. If
more latency is required the value can be increased as necessary (latency = TAFL - 5).
NOTE: A FIFO overflow is a fatal error and requires a global reset on the transmit datapath or at least
deassertion of ETHER_EN.
44.3.29 Transmit Inter-Packet Gap (ENET_TIPG)
Address: ENET_TIPG is 400C_0000h base + 1ACh offset = 400C_01ACh
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
IPG
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0
ENET_TIPG field descriptions
Field
31–5
Reserved
4–0
IPG
Description
This read-only field is reserved and always has the value zero.
Transmit inter-packet gap
Indicates the IPG, in bytes, between transmitted frames. Can be set between 8 and 27. If set to less than
8, the IPG is 8. If set to greater than 27, the IPG is 27.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1161