Diamond Systems Hercules III, User Manual, Page: 43 / 86

Hercules III User Manual Rev A.2
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Page
43
Data Acquisition Circuitry I/O Map
I/O Memory Space
The data acquisition circuitry on Hercules III occupies a block of 32 bytes in I/O memory space. The default
address range for this block is 0x240
– 0x24F (base address 0x240).
The address range is a 32-byte block in ISA I/O Space. Within these 32-bytes, the registers are paged to provide
full access to additional registers for additional functions; four pages (0-3) are available. Page is configured using
the first register of the address space, located at the base address. Byte zero is always present and is mirrored
across all four pages so the page register is always available.
The following tables list the register functions and base address offset, for each of the four pages.
Page 0
Base + Write Function Read Function
0 Reset + page register A/D LSB
1 Analog configuration register A/D MSB
2 A/D low channel A/D low channel readback
3 A/D high channel A/D high channel readback
4 A/D range register A/D range + status readback
5 D/A channel -
6 D/A LSB -
7 D/A MSB -
8 FIFO threshold LSB FIFO threshold LSB readback
9 FIFO threshold MSB FIFO threshold MSB readback
10 - FIFO depth LSB
11 - FIFO depth MSB
12 Configuration register Configuration register readback
13 Operation control register Operation control register readback
14 - Operation status register
15 Command register Hardware A/D channel
readback
16 DIO port A DIO port A
17 DIO port B DIO port B
18 DIO port C DIO port C
19 DIO port D DIO port D
20 DIO port E DIO port E
21 - -
22 DIO config / bit set DIO config readback
23 - -
24 Ctr/timer LSB Ctr/timer LSB
25 Ctr/timer CSB Ctr/timer CSB
26 Ctr/timer MSB Ctr/timer MSB
27 Ctr command/configuration register -
28 Watchdog timer A LSB Watchdog timer A LSB
29 Watchdog timer A MSB Watchdog timer A MSB
30 Watchdog timer B data Watchdog timer B data
31 Watchdog configuration register Watchdog config. register readback