AMD-K6-2E/400AFR AMD [Advanced Micro Devices], AMD-K6-2E/400AFR Datasheet - Page 261

• Manufacturer Part Number: AMD-K6-2E/400AFR
• Manufacturer: AMD [Advanced Micro Devices]

22529B/0—January 2000
Figure 86. Debug Registers DR3, DR2, DR1, and DR0
Chapter 12
DR3
DR2
DR0
DR1
31 30 29 28 27 26 25 24 23 22
31 30 29 28 27 26 25 24 23 22
31 30 29 28 27 26 25 24 23 22
31 30 29 28 27 26 25 24 23 22
DR3–DR0. The processor allows the setting of up to four
breakpoints. DR3–DR0 contain the linear addresses for
breakpoint 3 through breakpoint 0, respectively, and are
compared to the linear addresses of processor cycles to
determine if a breakpoint occurs. Debug register DR7 defines
the specific type of cycle that must occur in order for the
breakpoint to occur.
DR5–DR4. When debugging extensions are disabled (bit 3 of CR4
is 0), the DR5 and DR4 registers are mapped to DR7 and DR6,
respectively, in order to be software compatible with previous
generations of x86 processors. When debugging extensions are
21
21
21
21
20
20
20
20
Breakpoint 3 32-bit Linear Address
Breakpoint 2 32-bit Linear Address
Breakpoint 0 32-bit Linear Address
19
19
19
Breakpoint 1 32-bit Linear Address
19
18
18
18
18
Test and Debug
17
17
17
17
16
16
16
16
15
15
15
15
14
14
14
14
13
13
13
13
12
12
12
12
11
11
11
11
10
10
10
10
9
9
9
AMD-K6™-2E Processor Data Sheet
9
8
8
8
8
7
7
7
7
6
6
6
6
5
5
5
5
4
4
4
4
3
3
3
3
2
2
2
2
1
1
1
1
0
0
0
0
243