ISUAL Mass Memory Robert Abiad

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Outline Description Requirements Interfaces Block Diagram Usage Scheme Parts Development Status

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Description 2.6 GBit organized as 64 M x 40 bits 32 bit data word 7 bit Error Correction Code per word corrects all single bit errors and detects all double bit and some multiple bit errors. Base device is Samsung K4S560832A-TL1H 256 Mbit base device organized as 32M x 8bits.

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Requirements Store data from Imager at 8M pixels/s data rate Store data from Array Photometer at 20k samples/s x 32 channels/sample = 640k channels/s Store data from Spectrophotometer at 10k samples/s x 6 channels/sample = 60k channels/s Read telemetry data at 1.6 Mb/s Allow read/write from DPU Allow read/write from DCM

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Mass Memory Interfaces Imager IDC/ Mass Memory DPU 12 DATA SP AP CLK STB DATA-1 CLK STB DATA-2 DATA CMD0 CMD1 CLK DCM 32 2 DATA 26ADDR MBUSY 2 2 Telemetry CLK DATA RTS CTS R/W ACQUIRE 2

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Priorities Imager Memory Refresh Telemetry Array Photometer Fast Spectrophotometer Slow Spectrophotometer DPU DCM

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Mass Memory Block Diagram 32MB SDRAM Level Shift Level Shift Data Interface Address Interface Imager AP SP DPU DCM TLM

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Usage Scheme Circular buffers Fill on trigger –M Pretrigger –N Posttrigger Buffer switch Buffer Allocation Trigger M N AA Buffer Allocation B

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul SAMSUNG SDRAM Latch up immune up to 82 MeV/(mg/cm²) Radiation hardened to kRad total dose Radiation study done by Innovative Concepts, Inc. –No total dose issues –SEU rate of ~100 events/day –Uncorrectable error rate of ~4/day

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Development Status Engineering unit designed and built Actel 85% done Board powered up Currently debugging First tests to be done with DPU Interface tests planned with Imager and DCM

NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul Schematics Page 1

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