HP E1433A User's Guide
Register Definitions
Control Register: A write to this register causes specific actions to be executed by the device. The actions are described in the following table.
Bit | 15 |
| 1 | 0 | |
Contents | A24/A32 | Unused | Sysfail Inhibit | Reset | |
Enable | |||||
|
|
|
|
A24/A32 Enable: A one (1) in this field enables access to the device’s A24 VME Bus registers. A zero (0) disables such access.
Sysfail Inhibit: A one (1) disables the device from driving the SYSFAIL* line.
Reset: A one (1) forces the device into a reset state.
Offset Register: This read/write register defines the base address of the device’s A24 registers. The four most significant bits of the Offset register are the values of the four most significant bits of the device’s A24 register addresses. The 12 least significant bits of the Offset register are always zero (0). Thus, the Offset register bits
Port Control Register: This register is used to override the Local Bus control of the device. (This applies to HP E1433A modules that are equipped to use Local Bus). It has the following format:
Bit |
| 1 | 0 | |
Contents | Unused | LBus | LBus | |
Pipe | Enable | |||
|
|
LBus Pipe: Writing a one (1) puts the Local Bus into pipeline mode, if the LBus Enable bit is also set. Writing a zero (0) allows the Local Bus to operate in some other mode.
LBus Enable: Writing a one (1) enables the Local Bus interface. Writing a
zero (0) disables the local bus interface. RESET VALUE: 0
