Date: Thu, 21 Oct 2010 14:15:43 -0500 From: Mircea Bogdan A Tray incorporates 6 Tiles, placed in two rows of three. At each end of a row, there is one Analog Card (AC), which has 10 ASICs and services 40 analog inputs. Each Analog Card interfaces with two small Digital Cards (DC), placed right behind it, and attached each with a pair of PMC connectors. Figure Analog_Digital.jpg shows the block diagram of an Analog Card, together with the corresponding two Digital Cards. A DC communicates with 5 ASICs, generates a local trigger pulse, and reads all 5 data buses in parallel. After local processing and reduction, data are ready to be passed along, to the Tray Master Card (TMC). Each DC can be stuffed with an auxiliary USB interface for prototype testing and setup. Figure Tray_Clocks.jpg shows the block diagram of a tray DAQ, with emphasys on clock distribution, and data readout. The TMC controls a full Tray of 4 ACs and 8 DCs: - sends a low jitter system clock to all cards in the Tray; - generates all control signals required in the Tray; - receives data from all DCs, and sends data out, via an Optical Link, for further processing and storage. The TMC is also provided with a USB interface for setup and testing. In case of a multiple tray system, a TMC can be stuffed with a system clock oscillator, which would send clocks out to all other trays, and one clock back to itself. In a multiple tray system, only one TMC will generate a clock, the other TMCs will run on the clocks received. [ Part 2, Image/JPEG 2.5MB. ] [ Unable to print this part. ] [ Part 3, Image/JPEG 1.8MB. ] [ Unable to print this part. ]