TDT RZ2, Manual, Page: 15 / 736

System 3 1-9
RZ2 BioAmp Processor
The RZ2_Input_MC macro also transfers inputs from the I/O interface to the Data
Pipe bus and DSPs.
The zHop Bus
The zHop bus is useful for transferring single or low channel count signals, such as
timing and control signals.
In RPvdsEx data is transferred across the zHop Bus using paired zHop components,
including zHopIn, zHopOut, MCzHopIn, MCzHopOut, and MCzHopPick. These
components can be used on any DSP or DSP-core. Up to 126 pairs can be used
in a single RPvdsEx circuit.
The zHopBus is less efficient than the Data Pipe bus, so it is not recommended for
multi-channel signals.
Bus Related Delays
A standard two sample delay is associated with the zHop, and Data Pipe. However,
these delays are taken care of for the user in Synapse and when Timing and Data
Saving macros are used in OpenEx.
50 kHz Sampling Rate Acquisition with the PZ Amplifier
The RZ2 and PZ amplifier support sample rates from ~6 kHz to ~50 kHz.
When sampling at a rate of ~50 kHz, there are several important considerations:
• Only the first 128 PZ amplifier channels will be available.
• All Data Pipes will have a max of 128 channels instead of 256.
• Both halves (A and B) of the PipeSource component must be selecting the
desired source. For example, when acquiring data from a PZ amplifier,
Pipe[A] and Pipe[B] both need to be set to Amp. Chan[1...128].
Data Transfer Rate
As with other devices, your expected sustained RZ-to-Host PC data rate should not
exceed 1/2 to 2/3 of the rated data transfer speed. For the RZ2 device this is 160
Mbits/second (Mbps) so your designs should have a sustained data rate of no