Motorola MVME172 User Manual Page 95
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VMEbus System Controller
With the exception of the optional SERCLK Driver and the Power
Monitor, the chip includes all the functions that a VMEbus System
Controller must provide. The System Controller is enabled/disabled with
the aid of an external jumper (the only jumper required in a VMEchip2
based VMEbus interface).
Arbiter
The arbitration algorithm used by the chip arbiter is selected by software.
All three arbitration modes defined in the VMEbus Specification are
supported: Priority (PRI), Round-Robin-Select (RRS), as well as Single
(SGL). When operating in the PRI mode, the arbiter asserts the BCLR line
whenever it detects a request for the bus whose level is higher that the one
being serviced.
The chip includes an arbitration timer, preventing a bus lockup when no
requester assumes control of the bus after the arbiter has issued a grant.
Using a control bit, this timer can be enabled or disabled. When enabled,
it assumes control of the bus by driving the BBSY signal after 256 µsecs,
releasing it after satisfying the requirements of the VMEbus specification,
and then re-arbitrating any pending bus requests.
IACK Daisy-Chain Driver
Complying with the latest revision of the VMEbus specification, the
System Controller includes an IACK Daisy-Chain Driver, ensuring that
the timing requirements of the IACK daisy-chain are satisfied.
Bus Timer
The Bus Timer is enabled/disabled by software to terminate a VMEbus
cycle by asserting BERR if any of the VMEbus data strobes is maintained
in its asserted state for longer than the programmed time-out period. The
time-out period can be set to 8, 64, or 256 secs. The bus timer terminates
an unresponded VMEbus cycle only if both it and the system controller are
enabled.
- VME Embedded Controller 1
- Programmer’s 1
- Reference Guide 1
- Restricted Rights Legend 2
- Manual Terminology 3
- Recent Updates 4
- Place holder 6
- Contents 7
- 1 ..............2-29 8
- 2 ...............2-31 9
- 1Board Description 19
- Requirements 22
- Block Diagrams 23
- RESET switch control 26
- Memory Maps 27
- (Continued) 33
- Detailed I/O Memory Maps 39
- 1514131211109876543210 44
- ABORT Switch 45
- RESET Switch 45
- (Continued) 48
- 0Memory Maps 59
- $FFFC1FF7 Checksum 1 60
- VMEbus Memory Map 64
- Sources of Local BERR* 66
- Functional Blocks 82
- VMEbus to Local Bus Interface 87
- Tick and Watchdog Timers 92
- VMEbus Interrupter 94
- VMEbus System Controller 95
- VMEchip2 100
- LCSR Programming Model 101
- OPER R/W 107
- WAIT RMW 132
- LVFAIR LVRW 133
- RESET switch is disabled 149
- WDBFE WDS/L WDRSE 150
- 2VMEchip2 153
- ABORT switch 175
- ABORT switch is depressed 175
- GPOEN3 GPOEN2 GPOEN1 GPOEN0 175
- GPIOO3 GPIOO2 GPIOO1 GPIOO0 176
- GCSR Programming Model 179
- Programming the GCSR 181
- Bit Numbers 182
- 3MC2 Chip 189
- Functional Description 190
- BBRAM Interface 191
- 82596CA LAN Interface 191
- MC2 Chip 192
- SRAM Memory Controller 193
- Z85230 SCC Interface 194
- Tick Timers 195
- Watchdog Timer 196
- Local Bus Timer 196
- D31-D24 D23-D16 D15-D8 D7-D0 197
- Programming Model 198
- MC2 Chip ID Register 199
- MC2 Chip Revision Register 199
- General Control Register 200
- Programming the Tick Timers 203
- Tick Timer 1 Compare Register 204
- Tick Timer 1 Counter 204
- Tick Timer 2 Compare Register 204
- Tick Timer 2 Counter 205
- LSB Prescaler Count Register 205
- LANC Error Status Register 218
- SCSI Error Status Register 221
- MVME172 Version Register 223
- Tick Timer 3 Compare Register 225
- Tick Timer 3 Counter 225
- Bus Clock Register 226
- RESET Switch Control Register 230
- DRAM Control Register 233
- MPU Status Register 234
- 4IP2 Chip 237
- IP2 Chip 240
- Programmable Clock 243
- Error Reporting 243
- Interrupts 244
- Overall Memory Map 245
- Chip ID Register 253
- Chip Revision Register 253
- Vector Base Register 254
- NAME($0A) 257
- NAME($0B) 257
- NAME($0C) 258
- NAME($0D) 258
- NAME($0E) 258
- NAME($0F) 258
- Registers 259
- NAME($18) 260
- NAME($19) 260
- NAME($1A) 260
- NAME($1B) 260
- IP Clock Register 264
- IP RESET Register 266
- IPEND CHANI 270
- OPER RRRRRRRS 272
- WIDTH1 WIDTH0 273
- DMAEI DMAEO 275
- 8-Bit Memory Space 282
- 16-Bit Memory Space 283
- 32-Bit Memory Space 284
- IP_a I/O Space 285
- IP_ab I/O Space 286
- IP_a ID Space 287
- IP to Local Bus Data Routing 288
- I/O and ID Space Accesses 290
- Introduction 291
- Features 291
- Cache Coherency 293
- Error Logging 297
- Arbitration 298
- Chip Defaults 298
- Register 300
- Offset Name 300
- Register Bit Names 302
- Memory Configuration Register 305
- Dummy Register 0 306
- Dummy Register 1 307
- Base Address Register 307
- BCLK Frequency Register 310
- Data Control Register 311
- Scrub Control Register 313
- Chip Prescaler Counter 315
- STON2-STON0 316
- Error Logger Register 321
- Error Address (Bits 31-24) 322
- Error Address (Bits 23-16) 323
- Error Address Bits (15-8) 323
- Error Address Bits (7-4) 323
- Error Syndrome Register 324
- Defaults Register 1 324
- Defaults Register 2 326
- Initialization 327
- Syndrome Decode 329
- ARelated Documentation 333
- Manufacturers’ Documents 334
- Document Title and Source 335
- Publication 335
- Related Documentation 336
- BUsing Interrupts on 337
- Numerics 341
- MCECC internal register 1-35 347
- Embedded Controller 353
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