5-110
Bus Interface
AMD-K5 Processor Technical Reference Manual
18524C/0—Nov1996
Starting at the falling edge of a recognized RESET, the proces-
sor performs the following actions, in the order shown:
1. Flush Pipeline—The processor invalidates the:
•
Instruction pipeline
2. Reinitialize—The processor reinitializes the following
resources to reset values:
•
General-purpose registers
•
System registers
•
Floating-point registers
•
Model-specific registers (MSRs)
•
Data-cache tag directory (linear and physical) and data
array. No writebacks are performed.
•
Instruction-cache tag directory (linear and physical) and
instruction array
•
Translation look-aside buffer (TLB)
•
Branch-prediction bits
•
Clears the interrupt flag (IF) in EFLAGS to 0
3. Jump To BIOS—The processor jumps to physical address
FFFF_FFF0h, the same entry point used after INIT, where
it expects to find the BIOS entry point.
The contents of AMD-K5 processor registers at the conclusion
of RESET or INIT is identical to that of the Pentium processor,
except that the CPU ID in EDX is 0000_050xh. The upper byte
of DX (DH) contains 05h and the lower byte of DX (DL) con-
tains 0xh, the processor’s type and stepping identifier.
Table 5-15 shows the contents of registers after RESET or
INIT. Table 5-16 shows the state of the processor’s outputs
after RESET.
Table 5-15. Register State After RESET or INIT
Register
Contents (hex)
EIP
FFFF_FFF0
EFLAGS
0000_0002
EAX
0000_0000
EBX
0000_0000
ECX
0000_0000
Summary of Contents for AMD-K5
Page 1: ...AMD K5 Processor Technical Reference Manual TM...
Page 10: ...x AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 24: ...1 4 Overview AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 54: ...2 30 Internal Architecture AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 116: ...4 26 Performance AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 356: ...6 44 System Design AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 380: ...7 24 Test and Debug AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 396: ...A 16 AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 406: ...I 10 Index AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...