s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 133
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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S3C2410A
COPROCESSOR DATA OPERATIONS (CDP)
The instruction is only executed if the condition is true. The various conditions are defined in Table 3-2. The
instruction encoding is shown in Figure 3-25.
This class of instruction is used to tell a coprocessor to perform some internal operation. No result is communicated
back to ARM920T, and it will not wait for the operation to complete. The coprocessor could contain a queue of such
instructions awaiting execution, and their execution can overlap other activity, allowing the coprocessor and
ARM920T to perform independent tasks in parallel.
COPROCESSOR INSTRUCTIONS
The S3C2410A, unlike some other ARM-based processors, does not have an external coprocessor interface. It does
not have a on-chip coprocessor also.
So then all coprocessor instructions will cause the undefined instruction trap to be taken on the S3C2410A. These
coprocessor instructions can be emulated by the undefined trap handler. Even though external coprocessor can not
be connected to the S3C2410A, the coprocessor instructions are still described here in full for completeness.
(Remember that any external coprocessor described in this section is a software emulation.)
Only bit 4 and bits 24 to 31 The coprocessor fields are significant to ARM920T. The remaining bits are used by
coprocessors. The above field names are used by convention, and particular coprocessors may redefine the use of
all fields except CP# as appropriate. The CP# field is used to contain an identifying number (in the range 0 to 15) for
each coprocessor, and a coprocessor will ignore any instruction which does not contain its number in the CP# field.
The conventional interpretation of the instruction is that the coprocessor should perform an operation specified in the
CP Opc field (and possibly in the CP field) on the contents of CRn and CRm, and place the result in CRd.
31
Cond
28
27
1110
Figure 3-25. Coprocessor Data Operation Instruction
24
23
CP Opc
[3:0] Coprocessor operand register
[7:5] Coprocessor information
[11:8] Coprocessor number
[15:12] Coprocessor destination register
[19:16] Coprocessor operand register
[23:20] Coprocessor operation code
[31:28] Condition Field
20
19
CRn
16
15
CRd
12
11
Cp#
8 7
Cp
5 4 3
0
ARM INSTRUCTION SET
CRm
0
3-51
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