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SECTION 9
APPLICATION COMMAND INTERFACE PROGRAMMING GUIDE
3-1
3. Command Chaining
The Application Command Interface supports the capability to issue a sequence of commands through the
interface which are executed in successive order. The commands are passed through the Application
Command Interface in a chain of Command Control Buffers and each Command Control Buffer is used to
issue a single command. The Application Command Interface informs the application about the completion
of all commands in the chain only until the last command has been executed successfully, or it informs
the application about the abnormal termination of a command when a fail state has been detected.
A command chain is built up when the application issues the CCB_ALLOCATE command through the
Application Command Interface via an already existing logical connection to a device. The
CCB_ALLOCATE leads the Application Command Interface to allocate a given number of Command
Control Buffers and to chain these buffers to the Command Control Buffer associated with the logical
connection.
The entry [ccb_link] within the first part of each Command Control Buffer addresses the following
Command Control Buffer and the NULL pointer identifies the last Command Control Buffer in the chain (A
'single' Command Control Buffer is always the first and last Command Control Buffer in a 'chain' consisting
of only one Command Control Buffer).
To get rid of the Command Control Buffers chained to a Command Control Buffer associated with the
logical connection the application has to issue the CCB_FREE command to 'return' the occupied Command
Control Buffers to the Application Command Interface.
The following constraints apply to the command chains:
1.
Only READ and WRITE commands are allowed within the command chain. SERVICE
commands which affect the device driver only can be issued through the Application Command
Interface within a command chain.
2. Only
the first Command Control Buffer of the chain can be used to issue the CCB_FREE
command.
3.
The CCB_ALLOCATED command can be used only if the application already has issued an OPEN
command through the Application Command Interface and received its own Command Control
Buffer associated with the logical connection.
Содержание SYS68K/CPU-40
Страница 2: ...INTRODUCTION...
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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...
Страница 33: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 2 20 Figure 2 1 Location Diagram for All Jumperfields...
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 57: ...HARDWARE USER S MANUAL...
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Страница 70: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 2 4 Figure 2 2 Location Diagram of Jumperfields B17...
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...
Страница 179: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 24 Figure 6 4 Location Diagram of B13...
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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