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5.11 EMULATOR SUPPORT SIGNALS
The following signals support emulation by providing a means for an em-
ulator to disable the on-chip caches and memory management unit and by
supplying internal status information to an emulator. Refer to SECTION 12
APPLICATIONS INFORMATION for more detailed information on emulation
support.
5.11.1 Cache Disable (CDIS)
The cache disable signal dynamically disables the on-chip caches to assist
emulator support. Refer to 6.1 ON·CHIP CACHE ORGANIZATION AND OP·
ERATION for information about the caches; refer to SECTION 12 APPLlCA·
TIONS INFORMATION for a description of the use of this signal by an emulator.
CDIS does not flush the data ahd instruction caches; entries remain unaltered
and becQme available again when CDIS is negated.
5.11.2 MMU Disable (MMUDIS)
The MMU disable signal dynamically disables the translation of addresses
by the MMU. Refer to 9.4 ADDRESS TRANSLATION CACHE for a description
of address translation; refer to SECTION 12 APPLICATIONS INFORMATION
for a description of the use of this signal by an emulator. The assertion of
MMUDIS does not flush the address translation cache (ATC); ATC entries
become available again when MMUDIS is negated.
5.11.3 Pipeline Refill (REFILL)
The pipeline refill signal indicates that the MC68030 is beginning to refill the
internal instruction pipeline. Refer to SECTION 12 APPLICATIONS INFOR·
MATION for a description of the use of this signal by an emulator.
5.11.4 Internal Microsequencer Status (STATUS)
5-10
The microsequencer status signal indicates the state of the internal micro-
sequencer. The varying number of clocks for which this signal is asserted
indicates instruction boundaries, pending exceptions; and the halted con-
dition. Refer to SECTION 12 APPLICATIONS INFORMATION for a description
of the use of this signal by an emulator.
MC68030 USER'S MANUAL
MOTOROLA
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