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Local Bus Data Transfers
This section describes the use of the VXI backplane Local bus. The
HP E1429B digitizer uses the Local bus for high-speed (80 MBytes/second)
data transfers between two or more devices installed in adjacent mainframe
slots.
Local Bus
Description
The Local bus is a set of 12 signal lines on the backplane P2 connector. The
Local bus is segmented such that each device with Local bus capability has
two interfaces, one to each of the modules in the physically adjacent slots. A
device may connect the bus segments together, or connect to each segment
independently. Figure 3-14 shows how the lines are used by the
HP E1429B digitizer.
Data flows left to right over the Local bus through adjacent slots. The
following signal levels are allowed on the bus:
Analog low: ±5.5V, 50Ω
medium: ±16.0V, 500 mA
high: ±42.0V, 500 mA
Digital TTL: -0.5V to +5.5V, 200 mA
ECL: -5.46V to 0.0V, 50 mA
Figure 3-14. Local Bus Signal Line Definitions
156 Understanding the HP E1429 Digitizer Chapter 3