Title :
Bypassing the CAMAC data bus to read out FERA data at higher rates
Author :
Siegel, S. ; Vaquero, J.J. ; Seidel, J. ; Gandler, W.R. ; Green, M.V.
Author_Institution :
Nat. Inst. of Health, Bethesda, MD, USA
Abstract :
The CAMAC standard offers flexibility by providing power and a data bus for various modules, but it is limited to a 1 Mword/sec bandwidth. LeCroy Research CAMAC modules with an auxiliary data bus, FERA, provide a 10 Mword/sec data transfer without CAMAC controller intervention. The authors have used a National Instruments digital I/O board (PCI-DIO-32 HS) as a FERA bus-to-host bridge. The board provides hardware handshaking, a 20 Mword/sec bandwidth, bus master scatter-gather DMA, and can control up to 2 FERA buses asynchronously. Multiple boards may reside on the same PCI or Compact PCI bus. A 300 MHz Pentium II running Windows NT 4.0 sustains >3.4 MB/sec throughput in 8255 emulation mode. These capabilities are being exploited in the authors´ prototype small animal planar and PET imaging system where 32 ADC channels (16 bits each) and 3 scaler channels (32 bits each) define an event
Keywords :
CAMAC; biomedical electronics; positron emission tomography; radioisotope imaging; system buses; 300 MHz; 8255 emulation mode; CAMAC controller intervention; CAMAC data bus bypassing; FERA bus-to-host bridge; FERA data read out; LeCroy Research CAMAC modules; National Instruments digital I/O board; PET imaging system; Pentium II; Windows NT 4.0; auxiliary data bus; bandwidth; bus master scatter-gather DMA; hardware handshaking; small animal planar imaging; Animals; Bandwidth; Bridges; CAMAC; Emulation; Hardware; Instruments; Prototypes; Scattering; Throughput;
Conference_Titel :
Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-5021-9
DOI :
10.1109/NSSMIC.1998.773820