參數(shù)資料
型號: TC86R4600
廠商: Toshiba Corporation
英文描述: 64 Bit RISC Microprocessor(64位精簡指令集微處理器)
中文描述: 64位RISC微處理器(64位精簡指令集微處理器)
文件頁數(shù): 16/30頁
文件大?。?/td> 267K
代理商: TC86R4600
TC86R4600 64-bit RISC Microprocessor
14
T O S H IB A A M E R IC A E L E C T R O N IC C O M P O N E N T S , IN C
.
Table 7: Pipeline comparison between R4000PC and R4600
R4000PC
R4600
ALU latency
Load latency
Branch latency
Store buffer
Integer multiply
1 cycle
3 cycles
4 cycles (2 cycle penalty for taken branches)
2 doublewords
integer multiply hardware, 1 cycle to issue
1 cycle
2 cycles
2 cycles (no penalty for taken branches)
1 doubleword
done in floating-point multiplier, 4 cycles to
issue
done in floating-point adder, 4 cycles to issue
LO
available one cycle before
HI
HI
available one cycle before
LO
no,
HI
and
LO
written after
W
2 cycles
1 cycle to issue
1 cycle to issue
Integer divide
Integer multiply
Integer divide
HI
and
LO
hazards
MFHI
/
MFLO
latency
SLLV
,
SRLV
,
SRAV
DSLL
,
DSRL
,
DSRA
,
DSLL32
,
DSRL32
,
DSRA32
,
DSLLV
,
DSRLV
,
DSRAV
done in integer datapath adder, slips until done
HI
and
LO
available at the same time
HI
and
LO
available at the same time
yes,
HI
and
LO
written early in pipeline
1 cycle
2 cycles to issue
2 cycles to issue
Table 8: Co-processor 0 comparison between R4000PC and R4600
R4000PC
R4600
WatchLo
,
WatchHi
Config
Status
implemented
as described in MIPS R-Series Architecture
as described in MIPS R-Series Architecture
but
RP
not functional
no
unimplemented
subset
no
TS
or
RP
Low-power standby mode
WAIT
instruction disables internal clock, freez-
ing pipeline and other state; resume on inter-
rupt
always hazardous -- detected and 1-cycle slip
inserted
two new cache algorithms added to C field for
non-coherent write-through
Only bits meaningful on R4000PC imple-
mented
bits
5..3
used for reserved bits ITag
28..25
, bit
2 used for
F
bit
VCEI, VCED, and WATCH exceptions not
implemented
use vAddr
13
to select set, vAddr
12..5
to select
line of set
TagLo.P
stored if
Status.CE
set
Imp = 0x20
MFC0
/
MTC0
hazard
only hazardous for certain cp0 register com-
binations
as described in MIPS R-Series Architecture
EntryLo0
,
EntryLo1
TagLo
,
TagHi
,
ECC,
CacheErr
TagLo
R4000SC bits implemented but meaningless
as described in MIPS R-Series Architecture
Exceptions
as described in MIPS R-Series Architecture
(VCEI and VCED not possible in R4000PC)
use vAddr
12..4
to select line
Index
CACHE
ops
I Fill
CACHE
op
Index Store Tag
CACHE
op
PRId
Status.CE
ignored
Imp = 0x04
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