Xycom XVME 590, Manual

Page: 51 / 102

XVME-500/590 Manual
February, 1988
The Gain RAM is programmed by using the Gain/Channel Register (base + 85H). If
the module is operating in the Random Channel conversion mode (see Section
3.4.1.3) this register may also be used to “force” an A/D conversion start (much like
the function performed by bit D7 of the status/control register). Figure 3-2 shows
how the Gain/Channel register is arranged.
I
XVME-500/l
.
D7 D6 D O
.
Selects Gain
00-Gain=1
01-Gain=2
10-Gain=3
11-Gain=4
I
Selects Channel I
Configures the Register to Program (Iogic“1”)
or to Read/Convert the gain
Figure 3-2. Gain/Channel Register
The first five bits of this register (DO-D4) are used to select one of the input
channels (0 thru 15 for differential; 0 thru 3 1 for single-ended) for channel
conversion or channel gain programming. Table 3-4 lists the channel selection
codes which are used for DI (0-15) and SE (0-31) operation.
3-7