MC68030FE20C Freescale Semiconductor, MC68030FE20C Datasheet - Page 236

• Manufacturer Part Number: MC68030FE20C
• Description: IC MPU 32BIT ENHANCED 132-CQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68030FE20C

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-CQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

7.5 B U S E X C E P T I O N
l
l
MOTOROLA
2) SET FUNCTION CODE TO cPu SPACE
3) PLACE CPU SPACE TYPE 0 ON A16-A1R
4) BLADE BREAKPOINT NDMBEB ON A2-At~
2) CON~NUE PROCESSING
1} SET R/WTO READ
5) SET SIZE TO WORD
6) ASSERT ADDRESS STROBE (~) AND DATA STROBE (D-S}
IF DSACKx OR STERM ASSERTED:
IF BERR ASSERTED:
1) INITIATE ILLEGAL INSTRUCTION PROCESSING
1) PtACE LATCHED DATA IN INSTRUCTION PIPELINE
2) NEGATE AS AND OS
3) G0 TO@
21DOTD®
1) LATCH DATA
1) NEGATE AS AND OS
The MC68030 bus architecture requires assertion of either DSACKx or STERM
from an external device to signal that a bus cycle is complete. DSACKx,
STERM, or AVEC is not asserted if:
to enter exception processing for the error condition.
External circuitry can provide BERR when no device responds by asserting
processor asserts AS. This allows the cycle to terminate and the processor
The M M U can also detect an internal bus error. This occurs when the pro-
cessor attempts to access an address in a protected area of memory (a user
program attempts to access supervisor data, for example) or after the M M U
DSACKx, STERM, or AVEC within an appropriate period of time after the
receives a bus error while searching the address table for an address trans-
lation description.
• The external device does not respond.
• No interrupt vector is provided.
• Various other application-dependent errors occur.
BREAKPOINT ACKNOWLEDGE
PROCESSOR
®
Figure 7-46. Breakpoint Operation Flow
C O N T R O L
MC68030 USER'S MANUAL
or
J
, .
I-
C Y C L E S
2= ASSERT DATA TRANSFER AND SIZE ACKNOWLEDGE (DSACKx)
! ~ ASSERT BUS ERROR (BERR} TO INITIATE EXCEPTION PROCESSING
, PLACE REPLACEMENT OPCODE ON DATA BUS
OR SYNCHRONOUS TERMINATION (STERM)
SLAVE NEGATES DSACKx. STERM OR BERR
EXTERNAl DEVICE
-
O R
I
-
7-75
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