Table 46-85. Receive Buffer Descriptor Field Definitions (continued)
Word
Field
Description
A
15–6
Reserved, must be cleared.
A
5
ICE
IP header checksum error. This is an accelerator option. This bit is written by the
uDMA. Set when either a non-IP frame is received or the IP header checksum
was invalid. An IP frame with less than 3 bytes of payload is considered to be an
invalid IP frame. This bit is only valid if the L bit is set.
A
4
PCR
Protocol checksum error. This is an accelerator option. This bit is written by the
uDMA. Set when the checksum of the protocol is invalid or an unknown protocol
is found and checksumming could not be performed. This bit is only valid if the L
bit is set.
A
3
Reserved, must be cleared.
A
2
VLAN
VLAN. This is an accelerator option. This bit is written by the uDMA. This bit
means that the frame has a VLAN tag. This bit is valid only if the L bit is set.
A
1
IPV6
IPV6 Frame. This bit is written by the uDMA. This bit indicates that the frame
has a IPv6 frame type. If this bit is not set it means that an IPv4 or other protocol
frame was received. This bit is valid only if the L bit is set.
A
0
FRAG
IPv4 Fragment.This is an accelerator option.This bit is written by the uDMA.This
bit indicates that the frame is an IPv4 fragment frame. This bit is only valid when
the L bit is set.
C
15–11
Header length
Header length. This is an accelerator option. This field is written by the uDMA.
This field is the sum of 32 bit words found within the IP and its following protocol
headers. If an IP datagram with an unknown protocol is found the value is the
length of the IP header. If no IP frame or an erroneous IP header is found, the
value is 0. The following values are minimum values if no header options exist in
the respective headers:
• ICMP/IP: 6 (5 IP header, 1 ICMP header)
• UDP/IP: 7 (5 IP header, 2 UDP header)
• TCP/IP: 10 (5 IP header, 5 TCP header)
This field is only valid if the L bit is set.
C
10–8
Reserved, must be cleared.
C
7–0
Protocol type
Protocol type. This is an accelerator option. The 8-bit protocol field found within
the IP header of the frame. Only valid if ICE is cleared. This bit is only valid if the
L bit is set.
E
15–0
Payload
checksum
Internet payload checksum. This is an accelerator option. The one's complement
sum of the payload section of the IP frame. The sum is calculated over all data
following the IP header until the end of the IP payload. This field is valid only
when the L bit is set.
10
15
BDU
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).
10
14–0
Reserved, must be cleared.
12
15–0
Reserved, must be cleared.
14
15–0
1588 timestamp
This value is written by the uDMA. It is only valid if the L bit is set.
16
Table continues on the next page...
Chapter 46 10/100-Mbps Ethernet MAC (ENET)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1247
Содержание K53 Series
Страница 2: ...K53 Sub Family Reference Manual Rev 6 Nov 2011 2 Freescale Semiconductor Inc...
Страница 58: ...K53 Sub Family Reference Manual Rev 6 Nov 2011 58 Freescale Semiconductor Inc...
Страница 70: ...Orderable part numbers K53 Sub Family Reference Manual Rev 6 Nov 2011 70 Freescale Semiconductor Inc...
Страница 168: ...Human machine interfaces HMI K53 Sub Family Reference Manual Rev 6 Nov 2011 168 Freescale Semiconductor Inc...
Страница 206: ...Boot K53 Sub Family Reference Manual Rev 6 Nov 2011 206 Freescale Semiconductor Inc...
Страница 218: ...Security Interactions with other Modules K53 Sub Family Reference Manual Rev 6 Nov 2011 218 Freescale Semiconductor Inc...
Страница 342: ...PMC Memory Map Register Definition K53 Sub Family Reference Manual Rev 6 Nov 2011 342 Freescale Semiconductor Inc...
Страница 362: ...Functional description K53 Sub Family Reference Manual Rev 6 Nov 2011 362 Freescale Semiconductor Inc...
Страница 384: ...Initialization application information K53 Sub Family Reference Manual Rev 6 Nov 2011 384 Freescale Semiconductor Inc...
Страница 406: ...Application Information K53 Sub Family Reference Manual Rev 6 Nov 2011 406 Freescale Semiconductor Inc...
Страница 424: ...Functional Description K53 Sub Family Reference Manual Rev 6 Nov 2011 424 Freescale Semiconductor Inc...
Страница 514: ...Initialization application information K53 Sub Family Reference Manual Rev 6 Nov 2011 514 Freescale Semiconductor Inc...
Страница 524: ...Functional Description K53 Sub Family Reference Manual Rev 6 Nov 2011 524 Freescale Semiconductor Inc...
Страница 546: ...Restrictions on Watchdog Operation K53 Sub Family Reference Manual Rev 6 Nov 2011 546 Freescale Semiconductor Inc...
Страница 594: ...Interrupts K53 Sub Family Reference Manual Rev 6 Nov 2011 594 Freescale Semiconductor Inc...
Страница 628: ...Functional description K53 Sub Family Reference Manual Rev 6 Nov 2011 628 Freescale Semiconductor Inc...
Страница 702: ...Flash Operation in Low Power Modes K53 Sub Family Reference Manual Rev 6 Nov 2011 702 Freescale Semiconductor Inc...
Страница 772: ...Functional description K53 Sub Family Reference Manual Rev 6 Nov 2011 772 Freescale Semiconductor Inc...
Страница 808: ...Initialization Application Information K53 Sub Family Reference Manual Rev 6 Nov 2011 808 Freescale Semiconductor Inc...
Страница 864: ...Application information K53 Sub Family Reference Manual Rev 6 Nov 2011 864 Freescale Semiconductor Inc...
Страница 894: ...DAC Interrupts K53 Sub Family Reference Manual Rev 6 Nov 2011 894 Freescale Semiconductor Inc...
Страница 908: ...Functional Description K53 Sub Family Reference Manual Rev 6 Nov 2011 908 Freescale Semiconductor Inc...
Страница 920: ...Functional Description K53 Sub Family Reference Manual Rev 6 Nov 2011 920 Freescale Semiconductor Inc...
Страница 926: ...Functional Description K53 Sub Family Reference Manual Rev 6 Nov 2011 926 Freescale Semiconductor Inc...
Страница 1092: ...FTM Interrupts K53 Sub Family Reference Manual Rev 6 Nov 2011 1092 Freescale Semiconductor Inc...
Страница 1114: ...Functional description K53 Sub Family Reference Manual Rev 6 Nov 2011 1114 Freescale Semiconductor Inc...
Страница 1156: ...Functional description K53 Sub Family Reference Manual Rev 6 Nov 2011 1156 Freescale Semiconductor Inc...
Страница 1304: ...On The Go Operation K53 Sub Family Reference Manual Rev 6 Nov 2011 1304 Freescale Semiconductor Inc...
Страница 1334: ...USB Voltage Regulator Module Signal Descriptions K53 Sub Family Reference Manual Rev 6 Nov 2011 1334 Freescale Semiconductor Inc...
Страница 1388: ...Initialization Application Information K53 Sub Family Reference Manual Rev 6 Nov 2011 1388 Freescale Semiconductor Inc...
Страница 1514: ...Application information K53 Sub Family Reference Manual Rev 6 Nov 2011 1514 Freescale Semiconductor Inc...
Страница 1622: ...Software restrictions K53 Sub Family Reference Manual Rev 6 Nov 2011 1622 Freescale Semiconductor Inc...
Страница 1694: ...Initialization application information K53 Sub Family Reference Manual Rev 6 Nov 2011 1694 Freescale Semiconductor Inc...
Страница 1704: ...Functional description K53 Sub Family Reference Manual Rev 6 Nov 2011 1704 Freescale Semiconductor Inc...
Страница 1734: ...Application information K53 Sub Family Reference Manual Rev 6 Nov 2011 1734 Freescale Semiconductor Inc...
Страница 1800: ...Application information K53 Sub Family Reference Manual Rev 6 Nov 2011 1800 Freescale Semiconductor Inc...
Страница 1822: ...K53 Sub Family Reference Manual Rev 6 Nov 2011 1822 Freescale Semiconductor Inc...