. calcomp :: H-84-0045B vistagraphic DR11W DR11B DR11C and DR11B parallel interface users manual Nov1984 . he DRll, the DRllgenerates an interrupt in the host. 7. The host sets up the word count and starting address on the DRllfor the data transfer (NOTE: Word count is a function of theapplication software). 8. The host then writes to the DRll status register to initiate thetransfer. GO = 1READY =0FNCTl = 1 NOTE Since the DRVll-Bdoes not have a GO signal,GO is generated on the 24 bit SPI when READYgoes low. 26 QZ< Q< ULI a: < C/5 CO I- < Q cr2 3 LU < ^ uT ^ ^ ^ 111Q O Z ^§ ^ n =
. calcomp :: H-84-0045B vistagraphic DR11W DR11B DR11C and DR11B parallel interface users manual Nov1984 . he DRll, the DRllgenerates an interrupt in the host. 7. The host sets up the word count and starting address on the DRllfor the data transfer (NOTE: Word count is a function of theapplication software). 8. The host then writes to the DRll status register to initiate thetransfer. GO = 1READY =0FNCTl = 1 NOTE Since the DRVll-Bdoes not have a GO signal,GO is generated on the 24 bit SPI when READYgoes low. 26 QZ< Q< ULI a: < C/5 CO I- < Q cr2 3 LU < ^ uT ^ ^ ^ 111Q O Z ^§ ^ n = ^ ^ ^ CL LU H-u. 3 — -J m ± H ^ O y c/i c;^ £ Q LU a5 2: X V3 Qj ^ CO Q .CO O o acX Q 2 t- < X CO (XCO II Oh-DCL2 COX a:X co CLLU CO CLQ ^Z Z <o C0J2 X 2- ^ H CO Q Q 2 mLU , CO CO CO ^X CC i <h1x LU ^CO ^ X 1 > U. LU ^ z o Q CO O n Z ^ — UJLU .f: u- «iCO 4iZ Oh- CO H (J OO < u- u„X Q Z Q Luiii O UJ Z CL < UJ CO*^H UJ tr X < < a X CO X < I 5 CD< COQ CO CO CO QZ< la;So X. UJ QO o > UJ o AD us CL z UJ 03 > u. X O CO Lt. O o X Q Z LU He d d Hd d d oz > Q COX m > o u. OQ2 Input Transfer Handshaking Signals 27 9. The parallel interface resets the ATTN line. 10. Generates a CYCLE REQUEST A. CYCLE REQUEST A initiates a writecycle on the DRl1. 11. The DRll generates a BUSY (Bus Cycle in Operation) which setsICTL on the parallel interface of the Vistagraphic. 12. At the end of the bus cycle, the DRll generates END OF CYCLE(Data Taken) and resets ICTL on the 24 bit SPI completing thetransfer. NOTE With END OF CYCLE on, the DRVli-B does not exist;therefore, END OF CYCLE is generated when BUSYgoes false on the 24 bit SPI. 28 SECTION 4 SOFTWARE CHARACTERISTICS HOST-VISTAGRAPHIC COMMUNICATIONS All communications between the host computer and the Vistagraphic can be handledby GCP (Graphics Control Program), or can be downloaded user-generated in either direction are referred to as messages. Each mess
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