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Fsub Sti, St0, Sti

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23542A/0-September 2000 Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet Table 13. Floating-Point Instructions (continued) Instruction Mnemonic FSQRT (extended precision) FST mem32real FST mem64real FST ST(i)1 FSTCW FSTENV FSTP mem32real FSTP mem64real FSTP mem80real FSTP ST(i)1 FSTSW AX FSTSW mem16 FSUB ST(0), mem32real FSUB ST(0), mem64real FSUB ST(0), ST(i)1 FSUB ST(i), ST(0)1 FSUBP ST(0), ST(i)1 FSUBR ST(0), mem32real FSUBR ST(0), mem64real FSUBR ST(0), ST(i)1 FSUBR ST(i), ST(0)1 FSUBRP ST(i), ST(0)1 FTST FUCOM FUCOMP FUCOMPP FXAM FXCH FXTRACT FYL2X FYL2XP1 FWAIT First Second Byte Byte D9h FAh D9h DDh DDh D9h D9h D9h DDh D9h DDh DFh E0h DDh D8h DCh D8h DCh DEh D8h DCh D8h DCh DEh D9h E4h DDh DDh DAh E9h D9h E5h D9h D9h F4h D9h F1h D9h F9h 9Bh Notes: 1. The last three bits of the modR/M byte select the stack entry ST(i). ModR/M Byte mm-010-xxx mm-010-xxx 11-010-xxx mm-111-xxx mm-110-xxx mm-011-xxx mm-011-xxx mm-111-xxx 11-011-xxx mm-111-xxx mm-100-xxx mm-100-xxx 11-100-xxx 11-101-xxx 11-101-xxx mm-101-xxx mm-101-xxx 11-100-xxx 11-101-xxx 11-100-xxx 11-100-xxx 11-101-xxx 11-001-xxx Decode Type short short short RISC86 Operations float fstore fstore short fstore vector vector short short vector fstore fstore short float vector vector short short fload, float fload, float short float short float short float short fload, float short fload, float short float short float short float short float short float short float short float short float short float vector short float short float vector Chapter 3 Software Environment 85

Section	Page
IF YOU HAVE QUESTIONS, WE\	3
Contents	5
List of Figures	9
List of Tables	13
Revision History	17
About this Data Sheet	19
1 AMDK6™2E+ Embedded Processor	23
1.1 AMDK6™2E+ Embedded Processor Features	25
1.2 Process Technology	29
1.3 Super7™ Platform	30
2 Internal Architecture	33
2.1 Microarchitecture Overview	33
2.2 Cache, Instruction Prefetch, and Predecode Bits	38
2.3 Instruction Fetch and Decode	39
2.4 Centralized Scheduler	43
2.5 Execution Units	44
2.6 BranchPrediction Logic	47
3 Software Environment	49
3.1 Registers	49
3.2 ModelSpecific Registers (MSR)	66
3.3 Memory Management Registers	76
3.4 Paging	78
3.5 Descriptors and Gates	81
3.6 Exceptions and Interrupts	84
3.7 Instructions Supported by the AMDK6™2E+ Processor	85
4 Logic Symbol Diagram	113
5 Signal Descriptions	115
5.1 Signal Terminology	115
5.2 A20M# (Address Bit 20 Mask)	116
5.3 A[31:3] (Address Bus)	117
5.4 ADS# (Address Strobe)	118
5.5 ADSC# (Address Strobe Copy)	118
5.6 AHOLD (Address Hold)	119
5.7 AP (Address Parity)	120
5.8 APCHK# (Address Parity Check)	121
5.9 BE[7:0]# (Byte Enables)	122
5.10 BF[2:0] (Bus Frequency)	123
5.11 BOFF# (Backoff)	124
5.12 BRDY# (Burst Ready)	125
5.13 BRDYC# (Burst Ready Copy)	126
5.14 BREQ (Bus Request)	126
5.15 CACHE# (Cacheable Access)	127
5.16 CLK (Clock)	127
5.17 D/C# (Data/Code)	128
5.18 D[63:0] (Data Bus)	129
5.19 DP[7:0] (Data Parity)	130
5.20 EADS# (External Address Strobe)	131
5.21 EWBE# (External Write Buffer Empty)	132
5.22 FERR# (FloatingPoint Error)	133
5.23 FLUSH# (Cache Flush)	134
5.24 HIT# (Inquire Cycle Hit)	135
5.25 HITM# (Inquire Cycle Hit To Modified Line)	135
5.26 HLDA (Hold Acknowledge)	136
5.27 HOLD (Bus Hold Request)	137
5.28 IGNNE# (Ignore Numeric Exception)	138
5.29 INIT (Initialization)	139
5.30 INTR (Maskable Interrupt)	140
5.31 INV (Invalidation Request)	140
5.32 KEN# (Cache Enable)	141
5.33 LOCK# (Bus Lock)	142
5.34 M/IO# (Memory or I/O)	143
5.35 NA# (Next Address)	144
5.36 NMI (NonMaskable Interrupt)	145
5.37 PCD (Page Cache Disable)	146
5.38 PCHK# (Parity Check)	147
5.39 PWT (Page Writethrough)	148
5.40 RESET (Reset)	149
5.41 RSVD (Reserved)	150
5.42 SCYC (Split Cycle)	151
5.43 SMI# (System Management Interrupt)	152
5.44 SMIACT# (System Management Interrupt Active)	153
5.45 STPCLK# (Stop Clock)	154
5.46 TCK (Test Clock)	155
5.47 TDI (Test Data Input)	155
5.48 TDO (Test Data Output)	155
5.49 TMS (Test Mode Select)	156
5.50 TRST# (Test Reset)	156
5.51 VCC2DET (VCC2 Detect)	157
5.52 VCC2H/L# (VCC2 High/Low)	158
5.53 VID[4:0] (Voltage Identification)	159
5.54 W/R# (Write/Read)	160
5.55 WB/WT# (Writeback or Writethrough)	161
5.56 Pin Tables by Type	162
5.57 Bus Cycle Definitions	164
6 AMD PowerNow!™ Technology	165
6.1 Enhanced Power Management Features	165
6.2 Dynamic Core Frequency and Core Voltage Control	172
7 Bus Cycles	175
7.1 Timing Diagrams	175
7.2 Bus States	177
7.3 Memory Reads and Writes	180
7.4 I/O Read and Write	188
7.5 Inquire and Bus Arbitration Cycles	190
7.6 Special Bus Cycles	212
8 Poweron Configuration and Initialization	221
8.1 Signals Sampled During the Falling Transition of RESET	221
8.2 RESET Requirements	222
8.3 State of Processor After RESET	222
8.4 State of Processor After INIT	225
9 Cache Organization	227
9.1 MESI States in the L1 Data Cache and L2 Cache	229
9.2 Predecode Bits	230
9.3 Cache Operation	230
9.4 Cache Disabling and Flushing	233
9.5 L2 Cache Testing	235
9.6 CacheLine Fills	235
9.7 CacheLine Replacements	236
9.8 Write Allocate	237
9.9 Prefetching	242
9.10 Cache States	243
9.11 Cache Coherency	244
9.12 Writethrough and Writeback Coherency States	249
9.13 A20M# Masking of Cache Accesses	249
10 Write Merge Buffer	251
10.1 EWBE# Control	251
10.2 Memory Type Range Registers	253
10.3 Memory-Range Restrictions	255
10.4 Examples	257
11 FloatingPoint and Multimedia Execution Units	259
11.1 FloatingPoint Execution Unit	259
11.2 Multimedia and 3DNow!™ Execution Units	261
11.3 FloatingPoint and MMX™/3DNow!™ Instruction Compatibility	262
12 System Management Mode (SMM)	263
12.1 SMM Operating Mode and Default Register Values	263
12.2 SMM StateSave Area	265
12.3 SMM Revision Identifier	267
12.4 SMM Base Address	268
12.5 Halt Restart Slot	268
12.6 I/O Trap Doubleword	269
12.7 I/O Trap Restart Slot	270
12.8 Exceptions, Interrupts, and Debug in SMM	272
13 Test and Debug	273
13.1 BuiltIn SelfTest (BIST)	273
13.2 ThreeState Test Mode	274
13.3 BoundaryScan Test Access Port (TAP)	275
13.4 Cache Inhibit	285
13.5 L2 Cache and Tag Array Testing	286
13.6 Debug	290
14 Clock Control	297
14.1 Clock Control States	297
14.2 Halt State	300
14.3 Stop Grant State	300
14.4 Stop Grant Inquire State	302
14.5 EPM Stop Grant State	303
14.6 Stop Clock State	305
15 Electrical Data	307
15.1 Operating Ranges	308
15.2 Absolute Ratings	309
15.3 DC Characteristics	309
15.4 Power Dissipation	311
15.5 Power and Grounding	313
16 Signal Switching Characteristics	317
16.1 CLK Switching Characteristics	318
16.2 Clock Switching Characteristics for 100MHz Bus Operation	318
16.3 Clock Switching Characteristics for 66MHz Bus Operation	319
16.4 Valid Delay, Float, Setup, and Hold Timings	320
16.5 Output Delay Timings for 100MHz Bus Operation	320
16.6 Input Setup and Hold Timings for 100MHz Bus Operation	322
16.7 Output Delay Timings for 66MHz Bus Operation	324
16.8 Input Setup and Hold Timings for 66MHz Bus Operation	326
16.9 RESET and Test Signal Timing	328
16.10 Timing Diagrams	331
17 Thermal Design	335
17.1 Package Thermal Specifications	335
17.2 Measuring Case Temperature	339
17.3 Layout and Airflow Considerations	339
18 Pin Designations	343
18.1 Pins Designations for CPGA Package	344
18.2 Pins Designations for OBGA Package	348
19 Package Specifications	353
19.1 321Pin Staggered CPGA Package Specification	353
19.2 349Ball OBGA Package Specification	354
20 Ordering Information	355

Match case Limit results 1 per page

Chapter 3

Software Environment

23542A/0—September 2000

AMD-K6™-2E+ Embedded Processor Data Sheet

Preliminary Information

FSQRT (extended precision)

D9h

FAh

short

float

FST mem32real

D9h

mm-010-xxx

short

fstore

FST mem64real

DDh

mm-010-xxx

short

fstore

FST ST(i)

DDh

11-010-xxx

short

fstore

FSTCW

D9h

mm-111-xxx

vector

FSTENV

D9h

mm-110-xxx

vector

FSTP mem32real

D9h

mm-011-xxx

short

fstore

FSTP mem64real

DDh

mm-011-xxx

short

fstore

FSTP mem80real

D9h

mm-111-xxx

vector

FSTP ST(i)

DDh

11-011-xxx

short

float

FSTSW AX

DFh

E0h

vector

FSTSW mem16

DDh

mm-111-xxx

vector

FSUB ST(0), mem32real

D8h

mm-100-xxx

short

fload, float

FSUB ST(0), mem64real

DCh

mm-100-xxx

short

fload, float

FSUB ST(0), ST(i)

D8h

11-100-xxx

short

float

FSUB ST(i), ST(0)

DCh

11-101-xxx

short

float

FSUBP ST(0), ST(i)

DEh

11-101-xxx

short

float

FSUBR ST(0), mem32real

D8h

mm-101-xxx

short

fload, float

FSUBR ST(0), mem64real

DCh

mm-101-xxx

short

fload, float

FSUBR ST(0), ST(i)

D8h

11-100-xxx

short

float

FSUBR ST(i), ST(0)

DCh

11-101-xxx

short

float

FSUBRP ST(i), ST(0)

DEh

11-100-xxx

short

float

FTST

D9h

E4h

short

float

FUCOM

DDh

11-100-xxx

short

float

FUCOMP

DDh

11-101-xxx

short

float

FUCOMPP

DAh

E9h

short

float

FXAM

D9h

E5h

short

float

FXCH

D9h

11-001-xxx

short

float

FXTRACT

D9h

F4h

vector

FYL2X

D9h

F1h

short

float

FYL2XP1

D9h

F9h

short

float

FWAIT

9Bh

vector

Notes:

The last three bits of the modR/M byte select the stack entry ST(i).

Table 13.

Floating-Point Instructions (continued)

Instruction Mnemonic

First

Byte

Second

Byte

ModR/M

Byte

Decode

Type

RISC86

Operations