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Address Covering
1.3 Address Selection on the VME-ASIO16
The setting of the base board address ensues via jumpers of the
jumperfields BR1 and BR2. The base address can be selected over the
whole address range of 16 Mbytes in steps of 256 bytes.
Additionally it is possible to use the VME addressing mode ’SHORT -
I/O’. At this addressing the address lines A16 to A23 are ignored
and the base address of the VME-ASIO16 is placed into the ’SHORT
I/O’ address range (64 kbytes) of the VMEbus system.
The peripheral components DUART 68681 are provided with an 8 bits
wide data bus and with 4 address lines (A1 to A4). The addresses A5
to A7 select the desired DUART on the VME-ASIO16.
address
DUART
component
(HEX)
68681
xxxx00-1F
1
J26
xxxx20-3F
2
J25
xxxx40-5F
3
J24
xxxx60-7F
4
J23
xxxx80-9F
5
J22
xxxxA0-BF
6
J21
xxxxC0-DF
7
J20
xxxxE0-FF
8
J19
xxxx.....base address of the ASIO16
Table 1.3.1:
Address Model of the VME-ASIO16
For reduced versions of the VME-ASIO16 with less than 16 channels
only a part of the DUARTs will be inserted: starting at the end with
DUART no. 8, e.g. when the board is equipped with 4 channels, the
DUARTs 8 and 7 will be inserted, for 10 channels the DUARTs 8, 7, 6,
5 and 4 will be inserted.
The register model and the meaning of the single bits can be obtai-
ned from the data sheet of the DUART 68681 in the appendix.
VME-ASIO16 Rev. 1.7
11
Summary of Contents for VME - ASIO16
Page 1: ...VME VME ASIO16 ASIO16 16 16 serial serial Interfaces Interfaces VME ASIO16 Rev 1 7 ...
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