Address Assignment
3. Address Assignment
The basis address of the board is configured via the coding switches SW120...SW124. The basis
address can be set in steps of 32 bytes in the 16 Mbyte address range.
In addition to 'STANDARD' accesses (A24) there is the possibility to use the VME-addressing
'SHORT I/O' (jumper J120). In this addressing the address lines A16 to A23 are ignored and the
basis address of the VME-DAC1612 board is set in the 'SHORT I/O' address range (64 KByte) of
the VME-system.
The basis address of the VME-DAC1612 is default set to 0xXXE20000.
Each of the 16 D/A-converters of the VME-DAC1612 has got its own access address, which has to
be addressed word-by-word. In addition a mode register can be read in which the setting of the
operating mode and the number of equipped channels of the VME-DAC1612 is evaluated.
INFORMATION
If jumper J130/pin 1-2 is not set, the D/A-converters are selected by means of the data
bits D15...D12 (see page 27).
Unit
Offset
address
Access mode
D/A-converter:
DAC16
DAC15
DAC14
DAC13
DAC12
DAC11
DAC10
DAC9
+ 0x1E
+ 0x1C
+ 0x1A
+ 0x18
+ 0x16
+ 0x14
+ 0x12
+ 0x10
word-by-word,
only writing access
D/A-converter:
DAC8
DAC7
DAC6
DAC5
DAC4
DAC3
DAC2
DAC1
+ 0xE
+ 0xC
+ 0xA
+ 0x8
+ 0x6
+ 0x4
+ 0x2
+ 0x0
word-by-word,
only writing access
Mode register
+ 0x0
word-by-word,
only reading access
Table 4:
Address assignment of VME-DAC1612
Page 12 of 50
Manual • Doc. No.: V.1706.21 / Rev. 1.2
VME-DAC1612
