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BFISD 8079
The arbiter prioritizes bus access requests by devices (i.e., peripheral con-
trollers) aspiring to bus mastership. The design of the arbiter is such that
the 68010 always wants the bus, but gets it only when no other device wants it.
This means that the 68010 is the lowest-priority device in the system, giving
up the bus to any requesting device as soon as possible. Such a scheme allows
the highest processing speed, because the 68010 never has to take the time to
request the bus--access is automatic upon release by the current master.
Although the 68010 does not prioritize requests for bus accesses by external
controller boards, or devices, it nonetheless is part of the arbitration logic
circuitry. There are three bus arbitration signals used in the 68010:
a. Bus Request (BR-1)
b« Processor Bus Grant (PBG-)
c, CPU Bus grant ACKnowledge (CBACK-)
(Specific details of the signals can be found in the 68010 manual, under BR-,
BG-, and BGACK-.) When the 68010 is using the system I/O bus without competi-
tion, input signals BR-1 and CBACK- and output signal PEG- are inactive (high).
System bus arbitration begins when the bus request signal (BR-1) is asserted
(low). A bus request can come from a system I/O bus peripheral (on connector
J01, pin A13) or from the memory refresh circuitry. (Refer to the CMB Logic
Diagram, sheet 8.) The bus request signal is buffered by a 74S244 tristate
driver (IE) and sent to the 68010. At the time of the bus request signal, the
priority resolution cycle begins.
Bus access prioritization is done with the aid of three parallel arbitration
signals: BPRO- through BPR2- (Bus PRiority). These are placed on a special
three-line priority bus by the contending devices. The signals represent the
priority number of the device, which is set by switches or held in a register.
When the device issues the bus request signal, it places the unique priority
number on the priority bus and samples the bus signals at the same time.
This is allowed because the bus lines are encoded in such a way that the three
lines can represent only four possible numbers. Each line carries the (wire-)
OR of corresponding signals from all contending devices. When a device places
an asserted signal on a line, the low level pulls down that line, taking pre-
cedence over the highs. Thus the signals always indicate the highest number
placed on the priority bus. The priority bus signals are synchronized by an 8-
MHz Constant CLocK (CCLK-) signal, which is generated on the Central Micro-
processor Board. (Refer to the CMB Logic Diagram, sheet 5.)
3.2.11.1 Bus Arbitration Cycle
To minimize the number of priority bus lines required for the arbitration logic
to be able to select up to 16 devices, logic is included that samples the three
lines twice during each arbitration cycle. The resulting two steps in the pri-
ority bus examination process are as follows:
3-20
Содержание 2000 Series
Страница 1: ...Basic Four Series 2000 Desktop Computer System BFISD8079A Service Manual...
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Страница 16: ...BFISD 8079 Figure 1 1 Model 4108 Base Unit xvi...
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Страница 32: ...BFISD 8079 Figure 2 2 Location of Jumpers on Central Microprocessor Board 2 8...
Страница 33: ...BFISD 8079 Figure 2 3 Central Microprocessor Board Cable Part Numbers 2 9...
Страница 39: ...BFISD 8079 Figure 2 4 Location of Address Switches on Memory Array Module 2 15...
Страница 40: ...BFISD 8079 Figure 2 5 Location of Jumpers on Single Board Winchester Disk Controller 2 16...
Страница 42: ...BFISD 8079 Figure 2 6 Location of Switches on 4 Way Controller PCBA 2 18...
Страница 43: ...BFISD 8079 Figure 2 7 Location of Switch on Magnetic Cartridge Streamer Controller PCBA 2 19...
Страница 45: ...BFISD 8079 Figure 2 8 Location of Switches and Cable Information for LANC PCBA 2 21...
Страница 56: ...BFISD 8079 TBD Figure 3 1 Simplified Block Diagram Central Microprocessor Board 3 2...
Страница 83: ...BFISD 8079 TBD Figure 3 5 Simplified Block Diagram Dynamic Memory Support Subsystem 3 29...
Страница 89: ...BFISD 8079 TBD Figure 3 8 Simplified Block Diagram Memory Management Unit 3 35...
Страница 96: ...BFISD 8079 TBD Figure 3 10 Simplified Block Diagram CMB Serial Ports 3 42...
Страница 108: ...BFISD 8079 TBD Figure 3 12 Simplified Block Diagram CMB Floppy Disk Controller 3 54...
Страница 131: ...BFISD 8079 Figure 5 1 Location of Jumpers on Central Microprocessor Board 5 3...
Страница 132: ...BFISD 8079 Figure 5 2 Central Microprocessor Board Cable Part Numbers 5 4...
Страница 141: ...BFISD 8079 Figure 5 3 Location of Address Switches on Memory Array Module 5 13...
Страница 144: ...BFISD 8079 Figure 5 4 Location of Switches on 4 Way Controller PCBA 5 16...
Страница 147: ...BFISD 8079 Figure 5 5 Location of Jumpers on the Winchester Drive Controller PCBA 5 19...
Страница 149: ...BFISD 8079 Figure 5 6 Location of Switch on Magnetic Cartridge Streamer Controller PCBA 5 21...
Страница 152: ...BFISD 8079 LAN CONTROLLER LANC Figure 5 7 Location of Switches on Local Area Network Controller PCBA 5 24...
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Страница 160: ...BFISD 8079 Figure 6 1 CMB PCBA 6 2...
Страница 165: ...BFISD 8079 THIS PAGE LEFT BLANK INTENTIONALLY 6 7...
Страница 166: ...BFISD 8079 Figure 6 2 Memory Array 256K PCBA 6 8...
Страница 168: ...BFISD 8079 Figure 6 3 WDC Bus Adapter PCBA 6 10...
Страница 171: ...BFISD 8079 THIS PAGE LEFT BLANK INTENTIONALLY 6 13...
Страница 172: ...BFISD 8079 Figure 6 4 4 Way Controller PCBA 6 14...
Страница 175: ...BFISD 8079 THIS PAGE LEFT BLANK INTENTIONALLY 6 17...
Страница 176: ...BFISD 8079 Figure 6 5 MTCS Controller PCBA 6 18...
Страница 179: ...BFISD 8079 THIS PAGE LEFT BLANK INTENTIONALLY 6 21...
Страница 180: ...BFISD 8079 Figure 6 6 LAN Controller PCBA 6 22...
Страница 183: ...BFISD 8079 THIS PAGE LEFT BLANK INTENTIONALLY 6 25...
Страница 184: ...BFISD 8079 Figure 6 7 Winchester Drive Single Board Controller PCBA 6 26...
Страница 186: ...BFISD 8079 Figure 6 8 Power Supply Input Module PCBA 6 28...
Страница 189: ...BFISD 8079 THIS PAGE LEFT BLANK INTENTIONALLY 6 31...
Страница 190: ...BFISD 8079 Figure 6 9 Power Supply Output Module PCBA 6 32...
Страница 193: ...BFISD 8079 Figure 6 10 Power Supply Control Module PCBA 6 35...
Страница 197: ...BFISD 8079 Figure 7 3 Head Load Interlock Mechanism 7 3...
Страница 202: ...BFISD 8079 7 8...
Страница 220: ...BFISD 8079 Figure 7 33 Signal Interface Lines 7 26...
Страница 223: ...BFISD 8079 Figure 7 37 Factory Arrangement of Jumper 7 29...
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Страница 230: ...BFISD 8079 Figure 8 1 Major Component Location 8 2...
Страница 231: ...BFISD 8079 Figure 8 2 Head Disk Assembly 8 3...
Страница 240: ...BFISD 8079 8 12...
Страница 277: ...BFISD 8079 Figure 8 12 Winchester Drive Assembly 8 49...
Страница 278: ...BFISD 8079 Figure 8 13 Head Disk Disassembly 8 50...
Страница 281: ...BFISD 8079 Motor Speed Control PCBA Schematic 3 53...
Страница 282: ...BFISD 8079 Master Electronics PCBA Schematic 1 of 4 3 54...
Страница 283: ...BFISD 8079 Master Electronics PCBA Schematic 2 of 4 8 55...
Страница 284: ...BFISD 8079 Master Electronics PCBA Schematic 3 of 4 8 56...
Страница 285: ...BFISD 8079 Master Electronics PCBA Schematic 4 of 4 8 57...
Страница 286: ...BFISD 8079 Motor Speed Control PCBA Layout 8 58...
Страница 287: ...BFISD 8079 Master Electronics PCBA Layout 8 59 60...
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Страница 300: ...BFISD 8079 Figure 9 4 Location of Jumpers on the Winchester Drive Controller PCBA 9 12...
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Страница 338: ...BFISD 8079 PCBA Central Microprocessor Board Figure 10 1 PCBA Central Microprocessor Board 10 2...
Страница 339: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 1 of 58 10 3...
Страница 340: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 2 of 58 10 4...
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Страница 367: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 28 1 of 58 10 31...
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Страница 381: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 42 of 58 10 45...
Страница 382: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 43 of 58 10 46...
Страница 383: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 44 of 58 10 47...
Страница 384: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 45 of 58 10 48...
Страница 385: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 46 of 58 10 49...
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Страница 397: ...BFISD 8079 Figure 10 2 Logic Diagram Central Microprocessor Board Sheet 58 of 58 10 61 62...
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Страница 399: ...BFISD 8079 Memory Array PCBA Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 1 of 9 10 63...
Страница 400: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 2 of 9 10 64...
Страница 401: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 3 of 9 10 65...
Страница 402: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 4 of 9 10 66...
Страница 403: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 5 of 9 10 67...
Страница 404: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 6 of 9 10 68...
Страница 405: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 7 of 9 10 69...
Страница 406: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 8 of 9 10 70...
Страница 407: ...BFISD 8079 Figure 10 3 Logic Diagram Memory Array PCBA 903369 Rev A Sht 9 of 9 10 71 72...
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Страница 410: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 2 of 15 10 74...
Страница 411: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 3 of 15 10 75...
Страница 412: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 4 of 15 10 76...
Страница 413: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 5 of 15 10 77...
Страница 414: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 6 of 15 10 78...
Страница 415: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 7 of 15 10 79...
Страница 416: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 8 of 15 10 80...
Страница 417: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 9 of 15 10 81...
Страница 418: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 10 of 15 10 82...
Страница 419: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 11 of 15 10 83...
Страница 420: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 12 of 15 10 84...
Страница 421: ...PAGE MISSING This Page was misprinted in my original documentation is was page 10 85 and 10 87 printed on one page 10 85...
Страница 422: ...PAGE MISSING This Page was misprinted in my original documentation is was page 10 85 and 10 63 printed on one page 10 86...
Страница 423: ...BFISD 8079 Figure 10 4 Logic Diagram Winchester Disk Controller PCBA 903461 Rev C Sht 15 of 15 10 87 88...
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Страница 425: ...BFISD 8079 4 Way Controller Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 1 of 10 10 89...
Страница 426: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 2 of 10 10 90...
Страница 427: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 3 of 10 10 91...
Страница 428: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 4 of 10 10 92...
Страница 429: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 5 of 10 10 93...
Страница 430: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 6 of 10 10 94...
Страница 431: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 7 of 10 10 95...
Страница 432: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 8 of 10 10 96...
Страница 433: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 9 of 10 10 97...
Страница 434: ...BFISD 8079 Figure 10 5 Logic Diagram 4 Way Controller PCBA 903391 Rev E Sht 10 of 10 10 98...
Страница 436: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 3 of 20 10 100...
Страница 437: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 4 of 20 10 101...
Страница 438: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 5 of 20 10 102...
Страница 439: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 6 of 20 10 103...
Страница 440: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 7 of 20 10 104...
Страница 441: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 8 of 20 10 105...
Страница 442: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 9 of 20 10 106...
Страница 443: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 10 of 20 10 107...
Страница 444: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 11 of 20 10 108...
Страница 445: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 12 of 20 10 109...
Страница 446: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 13 of 20 10 110...
Страница 447: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 14 of 20 10 111...
Страница 448: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 15 of 20 10 112...
Страница 449: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 16 of 20 10 113...
Страница 450: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 17 of 20 10 114...
Страница 451: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 18 of 20 10 115...
Страница 452: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 19 of 20 10 116...
Страница 453: ...BFISD 8079 Figure 10 6 Logic Diagram Local Area Network Controller PCBA 903410 Rev C Sht 20 of 20 10 117 118...
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Страница 456: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 3 of 24 10 120...
Страница 457: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 4 of 24 10 121...
Страница 458: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 5 of 24 10 122...
Страница 459: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 6 of 24 10 123...
Страница 460: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 7 of 24 10 124...
Страница 461: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 8 of 24 10 125...
Страница 462: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 9 of 24 10 126...
Страница 463: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 10 of 24 10 127...
Страница 464: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 11 of 24 10 128...
Страница 465: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 12 of 24 10 129...
Страница 466: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 13 of 24 10 130...
Страница 467: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 14 of 24 10 131...
Страница 468: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 15 of 24 10 132...
Страница 469: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 16 of 24 10 133...
Страница 470: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 17 of 24 10 134...
Страница 471: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 18 of 24 10 135...
Страница 472: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 19 of 24 10 136...
Страница 473: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 20 of 24 10 137...
Страница 474: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 21 of 24 10 138...
Страница 475: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 22 of 24 10 139...
Страница 476: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 23 of 24 10 140...
Страница 477: ...BFISD 8079 Figure 10 7 Logic Diagram Magnetic Cartridge Streamer Controller PCBA 903427 Rev A 24 of 24 10 141 142...
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Страница 482: ...BFISD 8079 Figure 10 9 Logic Diagram Power Supply Output Module PCBA 903446 Rev B Sht 3 of 6 10 146...
Страница 483: ...BFISD 8079 Figure 10 9 Logic Diagram Power Supply Output Module PCBA 903446 Rev B Sht 4 of 6 10 147...
Страница 484: ...BFISD 8079 Figure 10 9 Logic Diagram Power Supply Output Module PCBA 903446 Rev B Sht 5 of 6 10 148...
Страница 485: ...BFISD 8079 Figure 10 9 Logic Diagram Power Supply Output Module PCBA 903446 Rev B Sht 6 of 6 10 149 150...
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Страница 488: ...BFISD 8079 Figure 10 10 Logic Diagram Power Supply Control Module PCBA 903404 Rev A Sht 3 of 3 10 152...