K60P100M100SF2RM Datasheet, PDF (1220/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Functional Description
Table 44-87. Enhanced Transmit Buffer Descriptor Field Definitions (continued)
Word
Offset + 8
Field
13
TS
Description
Timestamp. This bit is written by the user. This indicates that the uDMA is to
generate a timestamp frame to the MAC. This bit is valid regardless of the L bit
and must be the same for all EBD for the given frame. The uDMA does not
update this value.
Offset + 8
12
PINS
Insert protocol specific checksum. This bit is written by the user. If set, the
MAC's IP accelerator calculates the protocol checksum and overwrites the
corresponding checksum field with the calculated value. The checksum field
must be cleared by the application generating the frame. The uDMA does not
update this value. This bit is valid regardless of the L bit and must be the same
for all EBD for a given frame.
Offset + 8
11
Insert IP header checksum. This bit is written by the user. If set, the MAC's IP
IINS
accelerator calculates the IP header checksum and overwrites the
corresponding header field with the calculated value. The checksum field must
be cleared by the application generating the frame. The uDMA does not update
this value. This bit is valid regardless of the L bit and must be the same for all
EBD for a given frame.
Offset + 8
10–0
Reserved, must be cleared.
Offset + A
Offset + A
15
Transmit error occurred. This bit is written by the uDMA. This bit indicates that
TXE
there was a transmit error of some sort reported with the frame. Effectively this
bit is an OR of the other error bits including UE, EE, FE, LCE, OE, and TSE.
This bit is only valid when the L bit is set.
14
Reserved, must be cleared.
Offset + A
13
Underflow error. This bit is written by the uDMA. This bit indicates that the MAC
UE
reported an underflow error on transmit. This bit is only valid when the L bit is
set.
Offset + A
12
Excess Collision error. This bit is written by the uDMA. This bit indicates that the
EE
MAC reported an excess collision error on transmit. This bit is only valid when
the L bit is set.
Offset + A
11
Frame with error. This bit is written by the uDMA. This bit indicates that the MAC
FE
reported that the uDMA reported an error when providing the packet. This bit is
only valid when the L bit is set.
Offset + A
Offset + A
10
Late collision error. This bit is written by the uDMA. This bit indicates that the
LCE
MAC reported that there was a Late Collision on transmit. This bit is only valid
when the L bit is set.
9
Overflow error. This bit is written by the uDMA. This bit indicates that the MAC
OE
reported that there was a FIFO overflow condition on transmit. This bit is only
valid when the L bit is set.
Offset + A
8
Timestamp error. This bit is written by the uDMA. This bit indicates that the MAC
TSE
reported a different frame type then a timestamp frame. This bit is only valid
when the L bit is set.
Offset + A
Offset + C
Offset + E
Offset + 10
7–0
15–0
15–0
15
BDU
Reserved, must be cleared.
Reserved, must be cleared.
Reserved, must be cleared.
Last buffer descriptor update done. Indicates that the last BD data has been
updated by uDMA. This bit is written by the user (=0) and uDMA (=1).
Table continues on the next page...
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K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.