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SYS68K/CPU-40/41 USER'S MANUAL
FORCE COMPUTERS
6-18
6.4.3 The VMEbus Release Function
The CPU board contains several different software selectable bus release functions to relinquish VMEbus
mastership. The Bus Release Operation is independent of whether or not the on-board arbiter is enabled
and independent of the Bus Request level. Easy handling and usage of the bus release functions is
provided through the FGA-002 Gate Array. RMW Cycles are always completed before the bus is released.
VMEPROM allows the user to change the release function through the ARB command. Please refer to the
Introduction to VMEPROM for details. The modes are defined in the following chapters.
6.4.3.1 Release Every Cycle (REC)
The REC mode causes a release of VMEbus mastership after the initiated transfer cycle has been
completed. A normal read or write cycle is terminated after the address and data strobes are driven high
(inactive state). A Read Modify Write cycle (RMW) is terminated after the write cycle is completed by the
CPU, through deactivation of the address and data strobes. If the REC mode is enabled, all other bus
release functions have no impact ("don't care"). The REC mode is only for CPU cycles to the VMEbus, and
not for DMA cycles. The programming of the REC mode is described in the FGA-002 Gate Array User's
Manual.
6.4.3.2 Release on Request (ROR)
The ROR Mode is defined as a release of bus mastership if another bus requester has requested bus
mastership and the CPU board is the current bus master. The Gate Array contained DMA controller can
also be the requestor causing such a bus release. The ROR mode is only for CPU cycles to the VMEbus,
and not for DMA cycles. The ROR mode cannot be disabled, it is programmable how long the CPU stays
VMEbus master despite of a Bus Request pending. The programming of the ROR mode is described in
the FGA-002 Gate Array Manual.
6.4.3.3 Release After Timeout (RAT)
A timer with a fixed clock rate is installed in the FGA-002 providing a bus mastership release after 100
microseconds of no CPU cycles to the VMEbus. This release function is active only after the ROR mode
timeout. This function cannot be disabled. The RAT Mode is only for CPU cycles to the VMEbus and not
for DMA cycles. The programming of the RAT mode is described in the FGA-002 Gate Array Manual.
Содержание SYS68K/CPU-40
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Страница 8: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 1 2 Figure 1 1 Photo of the CPU Board...
Страница 9: ...SECTION 1 INTRODUCTION 1 3 Figure 1 2 Block Diagram of the CPU Board...
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Страница 34: ...SECTION 1 INTRODUCTION 2 21 Figure 2 2 The Front Panel of the CPU Board...
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Страница 42: ...INSTALLATION...
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Страница 83: ...SECTION 3 HARDWARE USER S MANUAL 3 13 Figure 3 2 Location Diagram of the System EPROM Area...
Страница 92: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 22 3 5 6 Location Diagram of Jumperfield B16...
Страница 95: ...SECTION 3 HARDWARE USER S MANUAL 3 25 Figure 3 5 Location Diagram of the Backup Supply Jumperfield B1 and B20...
Страница 98: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 28 Figure 3 6 Location Diagram of the Boot EPROM...
Страница 104: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 34 Figure 3 7 Location Diagram of the 0S S Resistors R563 to R569...
Страница 107: ...SECTION 3 HARDWARE USER S MANUAL 3 37 Figure 3 11 Location Diagram of RS232 Configuration Jumperfields B3 B4 B5 and B6...
Страница 110: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 40 Figure 3 12 Location Diagram of the 0S S Resistors R563 to R569...
Страница 133: ...SECTION 3 HARDWARE USER S MANUAL 3 63 Figure 3 24 CPU Board Front Panel and Rotary Switch Positions...
Страница 141: ...SECTION 3 HARDWARE USER S MANUAL 3 71 Figure 3 25 Location Diagram of Header B12...
Страница 152: ...SECTION 3 HARDWARE USER S MANUAL 4 3 Figure 4 1 Front Panel of the CPU Board...
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Страница 172: ...SECTION 3 HARDWARE USER S MANUAL 6 17 Figure 6 2 Location Diagram of Jumperfield B19...
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Страница 181: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 26 Figure 6 6 Location Diagram of Jumperfield B13...
Страница 183: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 28 Figure 6 8 Location Diagram of Jumperfield B2...
Страница 185: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 30 Figure 6 9 Location Diagram of Jumperfield B13...
Страница 187: ...APPENDIX TO THE HARDWARE USER S MANUAL...
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Страница 205: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 1 APPENDIX E CIRCUIT SCHEMATICS OF CPU BOARD...
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Страница 207: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 3 E 1 Circuit Schematics of DRM 01...
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Страница 209: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 5 E 2 Circuit Schematics of SRM 01...
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Страница 213: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL F 3 Location Diagram for All Jumperfields...
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Страница 228: ...COPIES OF DATA SHEETS...
Страница 229: ...COPIES OF DATA SHEETS RTC 72423 DUSCC 68562 PI T 68230...
Страница 230: ...USERS NOTES...
Страница 231: ...USERS NOTES...
Страница 232: ...USERS NOTES...
Страница 233: ...OPTIONS APPLICATIONS MODIFICATIONS...
Страница 234: ...INTRODUCTION TO VMEPROM IN USE WITH THE SYS68K CPU 40 41...
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Страница 268: ...APPENDIX TO THE INTRODUCTION TO VMEPROM...
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Страница 319: ...THE APPLICATION COMMAND INTERFACE PROGRAMMING GUIDE...
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