1 / 12

JTAG on CAN with LMB

JTAG on CAN with LMB. Estimation of time for JTAG/CAN conversion and propagation using the ATLAS/DCS LMB. Present CAN Bus system. 2 PCs, Win98 and Linux 3 CAN nodes Node with PCI I/F Node with VME I/F Local Monitor Box

deidra
Download Presentation

JTAG on CAN with LMB

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. JTAG on CAN with LMB Estimation of time for JTAG/CAN conversion and propagation using the ATLAS/DCS LMB C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  2. Present CAN Bus system • 2 PCs, Win98 and Linux • 3 CAN nodes • Node with PCI I/F • Node with VME I/F • Local Monitor Box • Operation of LMB from both side confirmed with DCS stndrd AVR software • Our ultimate goal is to control the TTC with JTAG via CAN, but presently no TTC connection has been achieved. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  3. Structure of LMB • Two mprocessors of ATMEL • AVR AT90S2313-10 10MHz,1Kbytes • AVR AT90S1200-12 12MHz • CAN Bus driver and controller C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  4. How to make JTAG with LMB • With CS = 0, Serial I/F of Can controller is used to input/output CAN data. • With CS = 1, SCLK,SDI,SDO with CSADC of PortD are used for JTAG lines. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  5. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  6. CAN JTAG conversion 1 • Put desired TMS,TDI sequence of JTAG into a CAN packet • In a packet total 32 steps of both TMS and TDI are stored. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  7. CAN JTAG conversion 2 • Results (see another slide for execution) • Program size 226 bytes • Data size 12 bytes • 5041 Cycle counts • 504.1msec/32 TMS instruction(=1 CAN packet) • LMB mproc. takes 15.8msec. for 1000 TMS instructions. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  8. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  9. CAN Bus network 1 • For JTAG 32TMS operation, we need two packets(Tx and Rx) and an extra packet for end flag. • The time consumption will be increased lineary with number of TMS operations. • The time consumption of the network access is serious than CAN/JTAG conversion proc. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  10. CAN Bus network 2 • Transfer Speed over the simplest CAN bus (1 to 1) with the TMS bit length (CAN bus 125Kbaud) • Rate=16.36KTMS/s C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  11. Transfer Rate versus Various CAN baud setting: For large scale CAN bus, baud rate 125K is recommended CAN Bus network 3 C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

  12. (Rough) Estimation for Total system • Assume total 500TMS/patch panel, and CAN baudrate 125Kbit/s. • It takes at least 31ms for one patch panel. • Since CAN is in principle 1 to 1 connection, we must multiply 12 for duration of 1 PS pack --> 372ms(0.37s) • Thus if we have 100 PS pack, it will take 37s for JTAG initialization. C.Fukunaga/TGC electronics meeting at CERN Feb.,11,2000

More Related