s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 530
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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PROGRAMMER'S MODEL
ABOUT THE ARM9TDMI PROGRAMMER'S MODEL
The ARM9TDMI processor core implements ARM v4T architecture, and so executes the ARM 32-bit instruction set
and the compressed Thumb 16-bit instruction set. The programmer's model is fully described in the ARM
Architecture Reference Manual. The ARM9TDMI Technical Reference Manual gives implementation details including
instruction execution cycle times.
The ARM v4T architecture specifies a small number of implementation options. The options selected in the
ARM9TDMI implementation are listed in Table 2-1. For comparison, the options selected for the ARM7TDMI
implementation are also shown
The ARM9TDMI is code-compatible with the ARM7TDMI, with two exceptions:
These differences are explained in more detail below.
DATA ABORT MODEL
The base restored data abort model differs from the base updated data abort model implemented by ARM7TDMI.
The difference in the data abort model affects only a very small section of operating system code, the data abort
handler. It does not affect user code. With the base restored data abort model, when a data abort exception occurs
during the execution of a memory access instruction, the base register is always restored by the processor hardware
to the value the register contained before the instruction was executed. This removes the need for the data abort
handler to unwind any base register update which may have been specified by the aborted instruction.
2-2
The ARM9TDMI implements the base restored data abort model, which significantly simplifies the software data
abort handler.
The ARM9TDMI fully implements the instruction set extension spaces added to the ARM (32-bit) instruction set
in architecture v4 and v4T.
Processor core
ARM7TDMI
ARM9TDMI
Table 2-1. ARM9TDMI Implementation Option
ARM architecture
v4T
v4T
Data abort model
Base updated
Base restored
STR, STRT, STM of PC
Value stored by direct
Address of Inst + 12
Address of Inst + 12
ARM920T PROCESSOR
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