PART 1 REFERENCE INFORMATION CONTROL DATA 6400 SYSTEMS CENTRAL PROCESSOR MONITOR

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1 . ~ PART 1 c 0 \,).,,.,, REFERENCE NFORMATON CONTROL DATA 6400 SYSTEMS CENTRAL PROCESSOR MONTOR n CONTROL DATA 6400 Compuer Sysems, sysem funcions are normally handled by he Monior locaed in a Peripheral and Conrol Processor. The 6400 Compuer Sysems are equipped wih cerain hardware capabiliies o effecively implemen Monior aciviies in he Cenral Processor. Since he Cenral Processor can reference Exended Core Sorage direcly for service rouines, programs and daa, a Cenral Processor Monior program o handle hese and oher funcions is faser and more efficien han a Monior residing in a Peripheral and Conrol Processor. The hardware elemens of a 6400 Sysem which provide he essenial capabiliies for implemening a Cenral Processor Monior are described in he ensuing paragraphs. MONTOR ADDRESS REGSTER Conained in he Exchange Jump package bis of locaion "n+6") is an 18-bi Monior Address. Jus as oher Cenral Processor operaional regisers are loaded during an Exchange operaion, so is he Monior Address regiser loaded wih he 18 -bi Monior Address. This Monio::- Address is he saring address of he Exchange package for an ensuing Cenral Exchange Jump insrucion excep when he Monior Flag bi is se; refer o he :lnsrucion descripion). MONTOR FLAG BT The Cenral Processor has, in he Cenral Memory conrol secion of he sysem, a Monior Flag bi. A Maser Clear Dead Sar) clears he Monior Flag bi, Any acion hereafer on his bi is via he Monior Exchange or he Cenral Exchange Jump insrucions. There is no insrucion wih which o sample he saus of his bi direcly and/ or independenly of hese insrucions.) The operaion of his Monior Flag bi is described under he insrucion descripions.. i. f i i l l 1-1 Rev A ; i f

2 c ~ MONTOR AND CENTRAL EXCHANGE JUMP NSTRUCTONS r,: \;, Two insrucions exis for Cenral Processor monior implemenaion:. one execuable by he Peripheral Processors; he oher execuable by he Cenral Processor. These insrucions are as deailed below. Peripheral Processors 261 MEJ Monior Exchange Jump 12 bis) F d No Used This insrucion, ypically used o iniiae Cenral Processor Monior aciviy, is a condiional exchange jump o he Cenral Processor. f he Monior Flag bi is clear, his insrucion ses he flag and iniiaes he exchange. f he Monior Flag bi is se, his insrucion acs as a Pass insrucion. The saring address for his exchange is he 18-bi address held in he Peripheral Processor A regiser. The Peripheral Processor program mus have loaded A wih an appropriae address prior o execuing his insrucion.) Noe ha his saring address is an absolue address. n l Cenral Processor 013 CEJ jk Cenral Exchange Jump 60 bis) fmi j K No Used This insrucion uncondiionally exchange jumps he Cenral Processor. regardless of he sae of he Monior Flag bi. nsrucion acion differs, however, depending on wheher he Monior Flag bi is se or clear. Operaion is as follows: a) Monior Flag bi clear. The saring address for he exchange is aken from he 18-bi Monior Address regiser. Noe ha his saring address is an absolue address. During he exchange, he Monior Flag bi is se.... Rev A 1-2

3 c :"" b) Monior Flag bi se. The saring address for he exchange is he 18-bi resul formed by adding K o ihe conens of regiser Bj. Noe ha his saring address is an absolue address. During he exchange, he Monior Flag bi is cleared, Table 1 summarizes he operaional differences beween he normal Exchange Jump insrucion 260) and he Monior and Cenral Exchange Jumps 261 and 013),,, \ TABLE 1-1. EXCHANGE NSTRUCTON DFFERENCES NSTRUCTON CONDTONAL/ UNCONDTONAL OPERATONAL DFFERENCES Effec on Locaion of Saring Monior Flag Bi Address for Exchange 260 Normal Peri- Uncondiional No effec on Flag Peripheral Processor pheral Processor A Regiser Exchange Jump} 261 Peripheral Pro- Condiional Ses Flag Peripheral Processor cessor Monior occurs only if A Regiser Exchange Jump} Monior Flag bi is clear; Passes if Flag is se} 013 Cenral Ex- Uncondiional Ses Flag Cenral Processor change Jump) wih Monior Address Monior Flag Bi Regiser clear 013 Cenral Ex- Uncondiional Clears Flag Address formed by change Jump} wih K+Bj} Monior Flag Bi se 1-3 Rev A

4 c: r, "" PROGRAMMNG NOTES 1) The Exchange package is precisely as described in he Compuer Sysems Reference manual Publicaion No ) wih he single excepion ha bis of locaion "n+6" hold a Monior Address. Noe ha any exchange 260, 261, or 013) o ha package will load he conens of locaion "n+6" ino he Monior Address regiser oher operaional regisers are similarly loaded). Thus, any ensuing O 13 insrucion using he conens of he Monior Address regiser as a saring address uses hose conens as loaded. 2) The Exchange packages for enering he Cenral Processor Monior should usually have he Reference Address RA) equal o and he Field Lengh FL) equal o Cenral Memory size. c, c:..., \ \,_., CJ 3) Since he Monior Flag bi canno be direcly sampled, a program canno direcly deermine is sae; hence, success in performing a Peripheral Processor Monior Exchange canno readily be prediced. Furher, program conrol alw&.ys is given o he nex insrucion, wheher or no he Exchange is honored. A mehod of deermining wheher he Monior Exchange occurred is as follows: a) Se Bo bis 0-17 of locaion "n") in he Exchange package o 7777 b) niiae he Monior Exchange 261) c) Read Bo from he Exchange package in Cenral Memory. f he Monior Exchange was honored, Bo in he Exchange package will equal f he insrucion passed, his locaion sill hold,3 7777, 4) Differen Exchange packages should be used for Cenral Processor exchanges and Peripheral Processor exchanges. This aids sofware deerminaion of which of wo jumps Cenral or Monior Exchange Jumps) was execued when boh were iniiaed a approximaely he same ime. C;, : c: Rev A 1-4

5 l 5) Simulaneous Exchange requess are resolved in favor of he Cenral Processor. -. 6) f eiher a 260 or 261 insrucion are waiing o be honored when he Cenral Processor issues an O 13 K insrucion, he 013 insrucion is no execued and he Peripheral Processor Exchange occurs. When conrol is reurned o he exchanged program he inerruped program conaining he O 13jK insrucion), he O 13jK insrucion is re-is sued and execued. 7) The sae of he Monior Flag bi has no effec on he operaion of he normal PP Exchange Jump 260); nor has his insrucion any effec on he Flag. 1-5 Rev A