TDT RZ2 Manual page 356

7-42
Setting Multiple Channels for Stimulation or Local Reference
To configure multiple reference channels, the Channel Select Method on the Setup
tab of the macros properties box must be set to With Chan Mask. In this mode,
StimChan and RefChan inputs accept an integer value channel mask representative
of the desired channels (shown in the table below). The integer value is the sum
of the channel masks for the channels.
For example:
If you wish to simultaneously set channels 1 (channel mask 1), 2 (channel mask
2), and 3 (channel mask 4) to stimulation mode add their respective channel
masks from the table above (1 + 2 + 4 = 7), and send that sum (7) to the
StimChan_Mask input as shown in the figure below.
This example sets channels 1, 2, and 3 for stimulation. Unused banks of channels
are powered down. The stimulus design and delivery are not included in this circuit
segment.
The reference channels can be configured in the same way, using the integer values
in the Channel Mask Table above. The iXor component can also be used to set all
channels NOT set as stimulation to reference. In the figure below, an iXor is used
to perform an exclusive bitwise OR function. The channel mask for stimulation is
XORed with the integer mask value for all channels, resulting in a channel mask that
sets all non-stimulus channels to reference channels.
MS4/MS16 Stimulus Isolator
Channel # Channel Mask
1 1
2 2
3 4
4 8
5 16
6 32
7 64
8 128
Channel Mask Table
Channel #
9
10
11
12
13
14
15
16
System 3
Channel Mask
256
512
1024
2048
4096
8192
16384
32768