Hardware Description
SYS68K/CPU-30 R4 Technical Reference Manual
Page 112
3.23 Reset Generation
There is an IEEE 1014 compatible SYSRESET* driver installed on the
CPU board. The reset generation circuitry operates when the power
supply voltage Vcc reaches approximately 3 volts. The local reset signal
will be asserted (low) for any one of the following conditions:
- Front panel RESET switch toggled
- Voltage Sensor unit detects Vcc below limit
- Execution of the RESET instruction by the local 68030
- Optional watchdog reset timer from PI/T #2 expires
An asserted reset signal will be held low (active) for at least 200
milliseconds after all the above conditions are removed.
NOTE: The VME SYSRESET Generation must be enabled (controlled
by SW8-3). For further information, please refer to Section 3.22.2, ‘The
SYSRESET* Signal,’ on page 110.
3.23.1 Front Panel
Reset Switch
The RUN LED is red while the reset generator drives the on-board reset
signal. After reset, the LED light will change to green.
The upper switch on the front panel of the CPU board is the RESET
switch. Toggling it results in a reset of all on-board devices, independent
of all jumper options.
The function of the reset switch is controlled by SW7-1.
3.23.2 The RESET
Instruction
The RESET instruction of the microprocessor is designed to reset
peripherals under program control, without resetting the processor itself.
This instruction is fully supported by the CPU board. The RESET
instruction triggers the reset generator and resets all peripherals on the
board driving reset to low. At this point the processor on the CPU itself
will not be reset. Therefore, program execution will go on with the next
operation code. If another board asserts SYSRESET* before this
instruction-triggered reset is finished, then the processor will still not be
reset because of lockout logic.
SW7-1
Description
OFF
Panel Reset Switch enabled
ON
Panel Reset Switch disabled
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Содержание SYS68K/CPU-30 R4
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Страница 130: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 117 4 2 1 RTC 72421...
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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...
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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...