Specifications

Appendix A: DSP Requirements for TDM Plug-Ins 77
appendix a
DSP Requirements for TDM Plug-Ins
The tables on the following pages show the the-
oretical total number of instances of each Digi-
Rack TDM plug-in that can be powered by a sin-
gle DSP chip on Pro Tools|HD-series and MIX-
series cards. DSP usage differs according to card
type and DSP chip availability.
• For Pro Tools|HD-series systems, see
“DigiRack on Pro Tools|HD” on page 77.
• For Pro Tools|24 Mix-series systems, see
“DigiRack on Pro Tools|24 MIX” on page 81.
DigiRack on Pro Tools|HD
There are a total of nine DSP chips on a
Pro Tools|HD card (HD Accel, HD Core, and
HD Process). The type of chips available varies
depending on the type of HD-series card. Not all
plug-ins are supported on all types of chips.
HD Accel Card
Each HD Accel card includes nine DSP chips.
Seven of the chips on HD Accel cards are 220
MHz Motorola DSP chips. Four of these seven
chips are configured with 512k of external
SRAM to accommodate long delays and reverbs,
even at 88.2 kHz and higher sample rates. The
remaining three chips provide 160k of internal
memory, capable of supporting a wide variety of
plug-ins with more instances that previously
available.
Two chips are original Pro Tools|HD-series DSP
chips. These chips are used for mixers and plug-
ins.
HD Core and HD Process Cards
Each HD Core and HD Process card includes
nine DSP chips for mixers and plug-ins.
The tables in this Appendix show theoreti-
cal maximum performance when no other
plug-ins are sharing available DSP re-
sources. Among the many variables that af-
fect DSP usage is the fact that you will typ-
ically use more than one type of plug-in
simultaneously. Therefore, use the follow-
ing tables to gauge the relative efficiency of
a plug-in in various formats and at different
sample rates.