SYS68K/CPU-30 R4 Technical Reference Manual
Hardware Description
Page 83
Information transfers on the data bus are asynchronous and follow a
defined REQ/ACK handshake protocol. One byte of information may be
transferred with each handshake. An option is defined for synchronous
data transfer.
3.11.4.2 SCSIbus Signal
Termination
Each SCSIbus signal should be terminated at the physical start and the
physical end of the SCSIbus. Therefore, the CPU-30 R4 provides
circuitry for active termination.
Active termination can be controlled by switch SW7-3.
3.11.4.3 SCSIbus
Terminator
Power
The power for the terminator of any SCSI device will be provided from
the CPU board directly, or from the SCSIbus itself. If termination power
is not delivered from any other SCSI device, it is delivered from the CPU
board.
The TERMPWR (terminator power) supply from the CPU board is
protected by a self resetting fuse (1A max) and a diode in series, as
defined in the SCSI specification.
The on-board terminators will draw power from the SCSIbus
TERMPWR.
3.11.5 Summary of
the SCSIbus
Controller
Device
MB 87034
Access Address
FF80.3400
16
Port Width
Byte
Interrupt Request Level
Software Programmable
FGA-002 Interrupt Request Channel
Local IRQ #7
SW7-3
Description
OFF
Active SCSI termination on
ON
Active SCSI termination off
Содержание SYS68K/CPU-30 R4
Страница 41: ...Installation SYS68K CPU 30 R4 Technical Reference Manual Page 28...
Страница 127: ...Hardware Description SYS68K CPU 30 R4 Technical Reference Manual Page 114...
Страница 130: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 117 4 2 1 RTC 72421...
Страница 131: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 118 4 2 2 DUSCC 68562...
Страница 132: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 119 4 2 3 PI T TS68230...
Страница 133: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 120 4 2 4 SCSI 87033 34...
Страница 134: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 121 4 2 5 FDC37C65C...
Страница 135: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 122 4 2 6 LANCE Am79C90...
Страница 136: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 123 4 2 7 SIA Am7992B...
Страница 137: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 124 4 2 8 Motorola MC68030 and MC68882...
Страница 145: ...VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 132...
Страница 189: ...Appendix to VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 176...