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CANpro/104 User Manual
CTIM-00043 (0.01) 1/15/2010 www.connecttech.com 10
800-426-8979 | 519-836-1291
PeliCAN vs BasicCAN Addressing Modes
The SJA1000 can operate in 2 different modes, the PeliCAN mode which has extended features and
additional registers and which consume 128 bytes of address space per device (there are 2 devices on
this board). And, the BasicCAN mode which has reduced functionality but only consumes 32 bytes
of register space per device.
Note: The mode of operation of the SJA1000 is performed by changing Bit-7 of the Clock
Divider Register (which defaults to BasicCAN mode whenever a PC/104 Bus Reset occurs).
When the SJA1000’s are operated in BasicCAN mode, it is desirable to accommodate the smaller
number of registers by decoding a smaller amount of I/O Space (because the I/O Space region is
limited in total size).
The selection of Addressing Mode is done with Jumper J3C Position #2. This selection has no
meaning when Memory Space operation is enabled (see Jumper J3A above).
J3C Position #2
Function
Removed
PeliCAN Addressing mode enabled
Installed
BasicCAN Addressing mode enabled
Table 7
Addressing Examples
Example #1: Memory Address 0x4A6000 (this address is above the 1-Meg boundary)
0x4A6000 = 0100.1010.011X.XXXX.CJJJ.JJJJ (binary)
Address bits in red are matched against their respective Jumper settings.
X = Address bits that are ignored by the board.
C = Address bit that is used to select the SJA1000 controller.
J = Address bits that are used to select the SJA1000 registers.
Address
Bit
Bit
Value
J3A or J3B
Position
Installed
or Removed
23
0
J3A-2
Removed
22
1
J3A-3
Installed
21
0
Address Bit always decoded as “0”
20
0
Address Bit always decoded as “0”
19
1
J3A-4
Installed
18
0
J3A-5
Removed
17
1
J3A-6
Installed
16
0
J3B-1
Removed
15
0
J3B-2
Removed
14
1
J3B-3
Installed
13
1
J3B-4
Installed
Table 8