Agilent Technologies Agilent RF Switch Driver Board U2121A-101 - Manual (Page 18)

8 U2121A-101 Operating Guide
IO mapping
There are three main control bits used in the U2121A- 101 as shown
in tables below. These control bits also refers to the U2121A control
bit status.
Table 4 Output enable/disable control
Control Stage Control Bit, DO14 Description
Output disabled OFF (0) To disable all outputs in U2121A - 101
Output enabled ON (0) To enable all outputs in U2121A - 101
Table 5 Position information read back control
RF Switches Control Bit Description
D16 D15
8765x and 8762/3/4 OFF (0) ON (1) Read position information from 8765x and
8762/3/4 series switches
N181x ON (1) OFF (0) Read position information from N181x
series switches
WA RN I N G
DO NOT set both D15 and D16 control bits to ON stage!
U2931A Operating Guide.book Page 8 Tuesday, June 10, 2008 10:17 AM