HP E1429A manual Read-Out, To VME Bus, To Local Bus E1429B only, Number of Partitions

Read-Out

To VME Bus

After measurement completion, memory read-out may be requested for either channel separately or for both channels interleaved. Memory access is via repeated reading from a single VME register address; 16- or 32-bit accesses are permitted. This is the "channel I/O" model; i.e. memory can not be mapped or shared as can VME memory. Speed to VME Bus should be up to 2M transfers/s (16- or 32-bit transfers, 2M readings/s or 4M readings/s respectively); however, rates this high have not been tested with existing controllers.

To Local Bus (E1429B only)

After measurement completion, memory read-out may be requested for either channel separately or for both channels interleaved. (Data may also be routed to Local Bus in real-time, while digitizing is occurring.) Speed is up to 40 MBytes/s (20 Mreadings/s) for either channel separately, or 80 MBytes/s (40 Mreadings/s) for both channels interleaved.

Memory Size 524,288 readings per channel (512K, 1K=1024)

Nonvolatile memory A battery and associated support functions are provided to make the memory non-volatile for 4 years (nominal). Battery life can be extended to 7 years (nominal) shelf life by electronically disconnecting it. A register indicates low battery.

Partitions (Segments) When pre-arm readings are to be taken, and ARM:COUNt is from 1 to 128, memory is partitioned. This permits each partition to be used as a circular buffer, without disturbing data already recorded in other partitions. Each partition records data (both pre-arm and post-arm data) from one arm event.

Number of Partitions

1, 2, 4, 8, 16, 32, 64, or 128

Partitions are always equal-sized. The number of partitions is sufficient for the value programmed for ARM:COUNt. For example, an ARM:COUNt value of 5,6,7, or 8 will cause 8 partitions to be created.

318 Specifications Appendix A