Clocks

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ARM Clocks

The clocks are controlled by two registers at 0xE3103000 (ScePervasiveBaseClk). Currently, it is unknown how the values are interpreted. However, 0xE3103000 (one word) takes values 0 to 16, and increases clock speed while 0xE3103004 (single byte) takes values 0 to 8 and decreases clock speed. It is likely related to a PLL multiply and divide function.

The following are tests run to determine what the values of each register corresponds to. It appears that the maximum clock speed is 500MHz and the minimum clock speed is 16MHz.

0xE3103000 0xE3103004 Clock Speed (MHz)
0 0 37
0 1 35
0 2 32
0 3 29
0 4 27
0 5 24
0 6 22
0 7 19
0 8 16
1 0 37
1 1 35
1 2 32
1 3 30
1 4 27
1 5 24
1 6 22
1 7 19
1 8 16
2 0 37
2 1 35
2 2 32
2 3 30
2 4 27
2 5 24
2 6 22
2 7 19
2 8 16
3 0 79
3 1 74
3 2 69
3 3 63
3 4 58
3 5 53
3 6 48
3 7 43
3 8 37
4 0 107
4 1 100
4 2 93
4 3 86
4 4 79
4 5 72
4 6 65
4 7 58
4 8 51
5 0 162
5 1 152
5 2 142
5 3 131
5 4 121
5 5 110
5 6 100
5 7 90
5 8 79
6 0 218
6 1 204
6 2 190
6 3 176
6 4 163
6 5 148
6 6 135
6 7 121
6 8 107
7 0 329
7 1 308
7 2 287
7 3 266
7 4 246
7 5 225
7 6 204
7 7 183
7 8 162
8 0 439
8 1 411
8 2 384
8 3 356
8 4 329
8 5 301
8 6 273
8 7 246
8 8 218
9 0 494
9 1 463
9 2 432
9 3 401
9 4 370
9 5 339
9 6 308
9 7 277
9 8 245
10 0 328
10 1 308
10 2 287
10 3 266
10 4 245
10 5 225
10 6 204
10 7 183
10 8 162
11 0 37
11 1 35
11 2 32
11 3 30
11 4 27
11 5 24
11 6 22
11 7 19
11 8 16
12 0 121
12 1 113
12 2 105
12 3 97
12 4 90
12 5 82
12 6 74
12 7 66
12 8 58
13 0 245
13 1 230
13 2 214
13 3 199
13 4 183
13 5 168
13 6 152
13 7 136
13 8 121
14 0 439
14 1 412
14 2 384
14 3 356
14 4 329
14 5 301
14 6 273
14 7 246
14 8 218
15 0 494
15 1 463
15 2 433
15 3 401
15 4 370
15 5 339
15 6 308
15 7 277
15 8 245
16 0 37
16 1 35
16 2 32
16 3 29
16 4 27
16 5 24
16 6 22
16 7 19
16 8 16