MC68030RC50C Freescale Semiconductor, MC68030RC50C Datasheet - Page 561

• Manufacturer Part Number: MC68030RC50C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030RC50C

• Processor Type: M680x0 32-Bit
• Speed: 50MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

2
12-36
12.7.1 STATUS and REFILL
As shown in Table 12-4, the number of consecutive clocks during which
The REFILL signal identifies when the microsequencer requests an instruction
The MC68030 provides the STATUS and REFILL signals to identify internal
controller, information concerning the processing state of the microsequen-
cer is not available by monitoring bus signals by themselves. The internal
and instruction pipeline refills. STATUS and REFILL track only the internal
microsequencer activity and are not directly related to bus activity.
STATUS is asserted indicates an instruction boundary, an exception to be
processed, or that the processor has halted. Note that the processor halted
condition is an internal error state in which the microsequencer has shut
itself down due to a double bus fault and is not related to the external
assertion of the HALT input signal. The HALT signal only affects bus oper-
ation, not the microsequencer.
struction execution to handle nonsequential events. Both exceptions and
include branches, jumps, instruction traps, returns, coprocessor general in-
microsequencer activity associated with the processing of data in the pipe-
line. Since bus cycles are independently controlled and scheduled by the bus
activity identified by the STATUS and REFILL signals include instruction
boundaries, some exception conditions, when the microsequencer has halted,
pipeline refill. Refill requests are a result of having to break sequential in-
instructions can cause the assertion of REFILL. Instructions that cause refills
2 Clocks
3 Clocks
1 Clock
.Continuously
Asserted for
T a b l e 12-4. M i c r o s e q u e n c e r S T A T U S I n d i c a t i o n s
Sequencer at instruction boundary will begin execution of next instruction
Sequencer at instruction boundary but will not begin next instruction immediately
due to:
MMU address translation cache miss -- processor to begin table search
Exception processing to begin for:
Processor halted due to double bus fault
• pending interrupt exception
• reset OR
• bus error OR
• address error OR
• pending trace exception
• spurious interrupt OR
• autovectored interrupt OR
•
F-line instruction (no coprocessor responded)
OR
OR
MC68030 USER'S MANUAL
Indicates
MOTOROLA