  The Gamma Ray Energy Tracking Array (GRETA) is a 4-{\pi} detector system,
currently under development, capable of determining energy, timing and tracking
of multiple gamma-ray interactions inside germanium crystals as demonstrated in
the Gamma Ray Energy Tracking In-Beam Array (GRETINA). Charge sensitive
amplifiers instrument the crystals and their outputs are converted using analog
to digital converters for real-time digital processing. In this paper, we will
present the design of the detector system and data acquisition. We will
describe the real time components of the digital signal-processing path used to
find the energy and timing of the gamma rays at low and high rates. We will
describe the performance of the data acquisition system hardware and firmware
and compare with the requirements.
