MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 908

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Enhanced Three-Speed Ethernet Controllers
15-176
Offset
0–1
10–13
Bits
5
6
7
8
9
Table 15-146. Transmit Data Buffer Descriptor (TxBD) Field Descriptions (continued)
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Name
PRE
DEF
HFE
RC
TC
CF
LC
RL
—
Tx CRC. Written by user. (Valid only while it is set in first BD and TxBD[PAD/CRC] is cleared and
MACCFG2[PAD/CRC enable] is cleared and MACCFG2[CRC enable] is cleared.) If
MACCFG2[PAD/CRC enable] is set or MACCFG2[CRC enable] is set, this bit is ignored in ethernet
modes.
If FIFOCFG[CRCAPP] is set, this bit is ignored in FIFO modes
0 End transmission immediately after the last data byte with no hardware generated CRC
1 Transmit the CRC sequence after the last data byte.
Transmit user-defined Ethernet preamble. Written by user. Valid only if set in the first BD of a frame,
and MACCFG2[PreAm TxEN] is set.
0 This frame does not contain Ethernet preamble bytes for transmission.
1 This frame includes a user-defined Ethernet preamble sequence prior to the destination address
Defer indication. The eTSEC updates this bit after transmitting a frame (TxBD[L] is set)
0 This frame was not deferred.
1 This frame did not have a collision before it was sent but it was sent late because of deferring
Reserved
Huge frame enable. Written by user. Valid only if set in the first BD of a frame and MACCFG2[Huge
Frame] is cleared. If MACCFG2[Huge Frame] is set, this bit is ignored.
0 Truncate transmit frame if its length is greater than the MAC’s maximum frame length.
1 Allow large frames to be transmitted without truncation.
Late collision. Written by the eTSEC.
0 No late collision.
1 A collision occurred after 64 bytes are sent. The eTSEC terminates the transmission and
Control Frame. Written by user. Valid only if set in the first BD of a frame.
0 Regular frame; transmission will be deferred when eTSEC is in PAUSE.
1 Control frame; transmission will start even if eTSEC is in PAUSE.
Retransmission Limit. Written by the eTSEC.
0 Transmission before maximum retry limit is hit.
1 The transmitter failed (max. retry limit + 1) attempts to successfully send a message due to
Retry Count. Written by the eTSEC.
0 The frame is sent correctly the first time.
x One or more attempts where needed to send the transmit frame. If this field is 15, then 15 or
appended, unless TxBD[PAD/CRC] is set.
in the data buffer.
updates LC.
repeated collisions. The eTSEC terminates the transmission and updates RL.
more retries were needed. The Ethernet controller updates RC after sending the buffer.
Description
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