1. ISUAL Mass Memory Robert Abiad

2. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20012 Outline Description Requirements Interfaces Block Diagram Usage Scheme Parts Development Status

3. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20013 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.

4. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20014 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

5. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20015 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

6. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20016 Priorities Imager Memory Refresh Telemetry Array Photometer Fast Spectrophotometer Slow Spectrophotometer DPU DCM

7. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20017 Mass Memory Block Diagram 32MB SDRAM Level Shift Level Shift Data Interface Address Interface Imager AP SP DPU DCM TLM

8. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20018 Usage Scheme Circular buffers Fill on trigger –M Pretrigger –N Posttrigger Buffer switch Buffer Allocation Trigger M N AA Buffer Allocation B

9. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 20019 SAMSUNG SDRAM Latch up immune up to 82 MeV/(mg/cm²) Radiation hardened to 17-40 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

10. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 200110 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

11. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 200111 Schematics Page 1

12. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 200112 Schematics Page 2

13. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 200113 Schematics Page 3

14. NCKU UCB Tohoku Mass Memory R. Abiad CDR 9-10 Jul 200114 Schematics Page 4