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TS68020DESC02XA View Datasheet(PDF) - Atmel Corporation

Part NameDescriptionManufacturer
TS68020DESC02XA HCMOS 32-bit Virtual Memory Microprocessor Atmel
Atmel Corporation Atmel
TS68020DESC02XA Datasheet PDF : 45 Pages
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TS68020
Other microprocessors in the TS68000 Family can operate any TS68000 co-processor
even though they may not have the hardware implementation of the co-processor inter-
face as does the TS68020. Since the co-processor is operated through the co-
processor interface registers which are accessed via normal asynchronous bus cycles,
the co-processor may be used as a peripheral device. Software easily emulates the
communication protocol by addressing the co-processor interface registers appropri-
ately and passing the necessary commands and operands required by the co-
processor.
The co-processor interface registers are implemented by the co-processor in addition to
those registers implemented as extensions to the TS68020 programmer’s model. For
example, the TS68881 implements the co-processor interface registers shown in Table
10 and the registers in the programming model, including eight 80-bit floating-point data
registers and three 32-bit control/status registers used by the TS68881 programmer.
Table 10. Co-processor Interface Registers
Register
Function
R/W
Response
Requests Action from CPU
R
Control
CPU
W
Save
Initiate Save of Internal State
R
Restore
Initiate Restore of Internal State
R/W
Operation Word
Current Co-processor Instruction
W
Command Word
Co-processor Specific Command
W
Condition Word
Condition to be Evaluated
W
Operand
32-bit Operand
R/W
Register Select
Specifies CPU Register or Mask
R
Instruction Address
Pointer to Co-processor Instruction
R/W
Operand Address
Pointer to Co-processor Operand
R/W
Table 11. Co-processor Primitives
Processor Synchronization
Busy with Current Instruction
Proceed with Next Instruction, If No Trace
Service Interrupts and Re-query, If Trace Enable
Proceed with Execution, Condition True/False
Instruction Manipulation
Transfer Operation Word
Transfer Words from Instruction Stream
Exception Handling
Take Privilege Violation if S Bit Not Set
Take Pre-Instruction Exception
Take Mid-Instruction Exception
Take Post-Instruction Exception
35
2115A–HIREL–07/02
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