Vax 613 0S Instruction Manual Page 6

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9.4.2 DMA Arbitration ......................................... 9–5
9.4.2.1 DMA Arbitration (300 Models) ............................ 9–5
9.4.2.2 DMA Arbitration (400/500/600/700/800/900 Models) ........... 9–6
9.4.3 I/O Timeout . ............................................ 9–6
9.4.4 I/O Conflicts . ............................................ 9–7
9.4.5 Masked I/O Read Operations ................................ 9–7
9.4.5.1 300 Models: Masked I/O Read Operations with a Non-Zero Byte
Mask . . . ............................................ 9–7
9.4.5.2 400/500/600/700/800/900 Models: I/O Read Operations with a
Non-Zero Byte Mask ................................... 9–7
9.5 JUNKIO Subsystem .......................................... 9–8
9.5.1 IOCTL ASIC Overview. .................................... 9–8
9.5.2 I/O Programming and System FEPROM ....................... 9–9
9.5.2.1 Ethernet Station Address ROM ........................... 9–9
9.5.2.2 LANCE Interface . . .................................... 9–9
9.5.2.3 LANCE DMA ......................................... 9–10
9.5.2.4 Serial Communications Controller (SCC) . ................... 9–10
9.5.2.5 DMA for Communication Transmit Port and Printer Port ....... 9–11
9.5.2.6 DMA for Communication Receive Port and Printer Port ........ 9–12
9.5.2.7 Real-Time Clock (RTC).................................. 9–13
9.5.2.8 79C30A (ISDN/audio) Interface ........................... 9–13
9.5.2.9 ISDN DMA .......................................... 9–14
9.5.2.10 Diagnostic LEDs (400/500/600/700/800/900 Models) . ........... 9–14
9.6 SCSI Interface . . ............................................ 9–15
9.6.1 SCSI Interface: Differences Among Models . . ................... 9–15
9.6.2 Dual SCSI ASIC Configuration . . ............................ 9–15
9.6.3 NCR 53C94 Configuration and Programming (300/400/500 Models). . . 9–16
9.6.4 53CF94-2 Configuration and Programming (600/700/800/900
Models) ................................................ 9–16
9.6.5 Initiation of DMA Transfers ................................. 9–18
9.6.5.1 Unaligned DMA Write Operation .......................... 9–19
9.6.5.2 Interrupt Service . . .................................... 9–19
9.6.6 Aborting Transactions . .................................... 9–19
10 Hardware Exceptions and Interrupts
10.1 Sources of Errors and Interrupts ................................ 10–2
10.2 Behavior of System Hardware Under Errors ....................... 10–4
10.3 System Error/Interrupt Matrix ................................. 10–5
10.4 Dual SCSI Error/Interrupt Matrix . . . ............................ 10–12
10.5 Error Insertion for Testing Purposes . ............................ 10–14
10.6 Assignment of CPU Interrupt Pins . . ............................ 10–15
10.7 Error Handling and Recovery .................................. 10–15
10.8 PAL Recovery Algorithms for Selected Errors . . . ................... 10–16
10.8.1 Bcache Tag Error on DMA Read/Write......................... 10–16
10.8.2 Bcache Tag Parity Error on CPU Reference, LDxL, STxC .......... 10–17
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