CAN Controllers and Acceptance Filter 208 May 03, 2004
Philips Semiconductors Preliminary User Manual
LPC2119/2129/2292/2294ARM-based Microcontroller
Extended Frame Start Address Register (EFF_sa - 0xE003 C00C)
Extended Frame Group Start Address Register (EFF_GRP_sa - 0xE003 C010)
End of AF Tables Register (ENDofTable - 0xE003 C014)
LUT Error Address Register (LUTerrAd - 0xE003 C018)
Table 149: Extended Frame Start Address Register (EFF_sa - 0xE003 C00C)
EFF_sa Name Function Reset Value
10:2
The start address of the table of individual Extended Identifiers in AF Lookup RAM. If the table
is empty, write the same value in this register and the EFF_GRP_sa register described below.
The largest value that should be written to this register is 0x800, when both Extended Tables
are empty and the last word (address 0x7FC) in AF Lookup Table RAM is used. For
compatibility with possible future devices, please write zeroes in bits 31:11 and 1:0 of this
register.
0
Table 150: Extended Frame Group Start Addr Register (EFF_GRP_sa - 0xE003 C010)
EFF_GRP_sa
Name Function Reset Value
11:2
The start address of the table of grouped Extended Identifiers in AF Lookup RAM. If the table
is empty, write the same value in this register and the ENDofTable register described below.
The largest value that should be written to this register is 0x800, when this table is empty
and the last word (address 0x7FC) in AF Lookup Table RAM is used. For compatibility with
possible future devices, please write zeroes in bits 31:12 and 1:0 of this register.
0
Table 151: End of AF Tables Register (ENDofTable - 0xE003 C014)
ENDofTable
Name Function Reset Value
11:2
The address above the last active address in the last active AF table. For compatibility with
possible future devices, please write zeroes in bits 31:12 and 1:0 of this register.
If the eFCAN bit in the AFMR is 0, the largest value that should be written to this register is
0x800, which allows the last word (address 0x7FC) in AF Lookup Table RAM to be used.
If the eFCAN bit in the AFMR is 1, this value marks the start of the area of Acceptance Filter
RAM, into which the Acceptance Filter will automatically receive messages for selected IDs
on selected CAN buses. In this case, the maximum value that should be written to this
register is 0x800 minus 6 times the value in SFF_sa. This allows 12 bytes of message
storage between this address and the end of Acceptance Filter RAM, for each Standard ID
that is specified between the start of Acceptance Filter RAM, and the next active AF table.
0
Table 152: LUT Error Address Register (LUTerrAd - 0xE003 C018)
LUTerrAd
Name Function Reset Value
10:2
It the LUT Error bit (below) is 1, this read-only field contains the address in AF Lookup Table
RAM, at which the Acceptance Filter encountered an error in the content of the tables.
0
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