OM11077 NXP Semiconductors, OM11077 Datasheet - Page 519

• Manufacturer Part Number: OM11077
• Description: MODULE DIMM LPC2478 ARM7
• Manufacturer: NXP Semiconductors

Specifications of OM11077

• Accessory Type: Module Card
• For Use With/related Products: ARM-57TS-LPC2478
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-4742

NXP Semiconductors
UM10237_4
User manual
18.4 Configuration example 4
18.5 Configuration example 5
In cases where explicit identifiers as well as groups of the identifiers are programmed, a
CAN identifier search has to start in the explicit identifier section first. If no match is found,
it continues the search in the group of identifier section. By this order it can be guaranteed
that in case where an explicit identifier match is found, the succeeding software can
directly proceed on this certain message whereas in case of a group of identifier match
the succeeding software needs more steps to identify the message.
Suppose that the five Acceptance Filter address registers contain the values shown in the
third column below. In this case each table contains the decimal number of words and
entries shown in the next two columns, and the ID Index field of the CANRFS register can
return the decimal values shown in the column ID Indexes for CAN messages whose
Identifiers match the entries in that table.
Table 456. Example of Acceptance Filter Tables and ID index Values
Figure 18–91
table layout, and ID Index values. It shows:
Table
Standard Individual
Standard Group
Extended Individual
Extended Group
•
•
•
•
A Standard Individual table starting at the start of Acceptance Filter RAM and
containing 26 Identifiers, followed by:
A Standard Group table containing 12 ranges of Identifiers, followed by:
An Extended Individual table containing 3 Identifiers, followed by:
An Extended Group table containing 2 ranges of Identifiers.
below is a more detailed and graphic example of the address registers,
Rev. 04 — 26 August 2009
Register
SFF_sa
SFF_GRP_sa
EFF_sa
EFF_GRP_sa
ENDofTable
0x040
0x060
0x100
Chapter 18: LPC24XX CAN controllers CAN1/2
Value
0x070
0x110
# Words
8
4
8
8
10
10
10
10
# Entire
16
4
16
16
10
10
10
10
UM10237
© NXP B.V. 2009. All rights reserved.
ID Indexes
0-15
16-19
20-55
56-57
519 of 792
10
10
10
10