ATST/BBSO Visit PALM-3000 Stephen Guiwits P 3 K System Hardware 126 Cahill February 11, 2010
PALM-3000 Agenda • High level overview of the P 3 K Electronics • P 3 K System Hardware – RTC Electronics – Interfaces and Layout • Xinetics Gen. III Communications – High Speed – Low Speed • Xinetics Gen. III Drivers – Stability – Features
PALM-3000 Overview
RTC Electronics PALM-3000 • Cluster of 10 PC’s in the computer room • Real-time calculations performed on 16 Nvidia GPU’s • PC 0 provides the servo control, central scheduling, and control of the cluster • PC 1 – PC 8 provides GPU calculations • PC 9 is dedicated to telemetry recording • Cluster communication provided by the high speed Quadrics switch • Qs. Net II (16 way solution) • 1064 Mbytes/s • 900 MB/S Sustainable 4
RTC Electronics PALM-3000 • RAID System – Nex. SAN Technologies – Configured for throughput optimization • RAID 0 • Two partitions – High Speed data – All other data • Optical Splitter provides duplicates frames to all 8 PC’s • All PC’s running Red Hat Enterprise Linux 5 – Kickstart set up for automated, repeatable installations – Custom RPMS built and tested specifically for P 3 K 5
PALM-3000 RTC Electronics PC 0 – 9 RAID System KVM Switch Quadrics High Speed Switch 16 Port Gigabit Ethernet Switch Optical Splitter 6
PALM-3000 Electronics Interfaces and Layout Ethernet Pvt net Fiber Splitter User Workstation (Data Room) AO Bench Wavefront Processor (computer room) DM Racks (Cass cage pos. 2 & 3) Controller Racks (Cass cage pos. 4 & 5)
PALM-3000 Xinetics Gen. III Communications • P 3 K Requires high speed communication and low speed communication with the Xinetics Gen. III Drivers • Low Speed (serial interface) to configure and monitor driver states • High Speed (SOR-422 U) for DM control 8
PALM-3000 High Speed Communications
High Speed Communications PALM-3000 Transmit End • Curtiss Wright Fibre. Xtreme SL 240 PCIe 2. 5 Gb/s Data Link Card – Up to 247 MB/s per channel sustained data rate per channel – Low overhead ANSI/VITA 17. 1 -2003 Serial FPDP Protocol • Based on Fiber Channel. Uses similar ordered sets – Low latency (about 1 us) – 4 independent channels 10
PALM-3000 High Speed Communications Receive End • Curtiss Wright Fibre. Xtreme SL 240 CMC 2. 5 Gb/s Data Link Card – IEEE P 1386 Common Mezzanine Card form factor (same as PMC) – 32 -bit parallel FPDP data bus @ 62. 5 MHz • Custom Carrier Board – 6 U VME form factor. FPGA based. –Four SOR-422 U parallel output ports for connection to Xinetics Drivers. –P 1 port for connection to LODM and TTM amplifiers.
PALM-3000 Low Speed Communications • Serial Communication @ 115200 Baud • Communicate with each driver through a terminal server – Terminal server has 16 RJ 45 ethernet ports – Each driver has a 9 pin DE 9 connector – 9 pin – RJ 45 adapter required • Drivers have a Primary/Secondary configuration – Specially developed by Xinetics for P 3 K 12
Xinetics Gen. III Drivers PALM-3000 • Software – Written for the low speed serial interface – Communicates via serial terminal server • PC ethernet terminal server RJ-45 9 pin driver • Certain commands are required for each driver while others are only required by the Primary driver – Commands tested for all 8 drivers • • • Power up Power down Put driver in proper mode (Normal or Test) Clear faults on the drive (Xinetics feature) Mute the drivers Drive actuator values Drive bias value Read back voltage table (needs adjusting) Read status table
PALM-3000 Xinetics Gen. III Drivers • Stability – Idle issues. Random driver will fault when powered on and not used – Work well after running • Had multiple runs over a 48+ hour period – Thousands of commands sent to date • Features – Daisy Chain • Developed for P 3 K by Xinetics – Undocumented software API – API bugs must be worked around (trial and error) 14
PALM-3000 Questions, Comments, Suggestions
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