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參數(shù)資料
| 型號(hào)： | PC8265A |
| 英文描述： | PC8265A [Updated 9/03. 59 Pages] |
| 中文描述： | PC8265A [更新9 / 03。 59頁] |
| 文件頁數(shù)： | 54/59頁 |
| 文件大?。?/td> | 455K |
| 代理商： | PC8265A |
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54
PC8265A PowerQUICC II
5336A–HIREL–08/03
Notes:
1. The user should verify that all buses and functions run frequencies that are within the supported ranges.
2. The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is divided by 2
(33 instead of 66 MHz, etc.) and the CPM multiplication factor is multiplied by 2.
3. Input clock frequency is given only for the purpose of reference. MODCK_H–MODCK_L should be set so that the resulting
configuration does not exceed the frequency rating of the user’s part.
Example. If a part is rated at 266 MHz CPU, 200 MHz CPM, and 66 MHz bus, any of the following are possible
(note that the three input clock frequencies are only three of many possible input clock frequencies):
1.
50 MHz input clock, MODCK_H–MODCK_L[0110–011] (with a core multiplication factor of 4, a CPM multiplica-
tion factor of 4, and a bus division factor of 3), and PCI_MODCK = 0 (see note 2 above). The PCI frequency is
50 MHz and the resulting configuration equals the part’s maximum possible frequencies of 266 MHz CPU,
200 MHz CPM, and 66 MHz 60x bus.
2.
66 MHz input clock, MODCK_H–MODCK_L[0100–001], and PCI_MODCK = 1 (see note 2 above) to achieve a
PCI frequency of 33 MHz and a configuration of 200MHz CPU, 200 MHz CPM, and 66 MHz 60x bus.
3.
40 MHz input clock, MODCK_H–MODCK_L[1001–011], and PCI_MODCK = 0 (see note 2 above) to achieve a
PCI frequency of 40 MHz and a configuration of 160 MHz CPU, 160 MHz CPM, and 40 MHz 60x bus.
Note that with each of the examples, any one of several values for MODCK_H–MODCK_L could possibly be used
as long as the resulting configuration does not exceed the part’s rating.
4. Core frequency = (60x bus frequency) (core multiplication factor)
5. Bus frequency = CPM frequency/bus division factor
6. In this mode, PCI_MODCK must be “1”.
MODCK_H –
MODCK[1–3]
Input Clock
Frequency
(PCI)
(2)(3)
CPM
Multiplication
Factor
(2)
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency
(
4)
Bus
Division
Factor
60x Bus
Frequency
(
5)
1010_000
66/33 MHz
4/8
266 MHz
2.5
222 MHz
3
88 MHz
1010_001
66/33 MHz
4/8
266 MHz
3
266 MHz
3
88 MHz
1010_010
66/33 MHz
4/8
266 MHz
3.5
300 MHz
3
88 MHz
1010_011
66/33 MHz
4/8
266 MHz
4
350 MHz
3
88 MHz
1010_100
66/33 MHz
4/8
266 MHz
4.5
400 MHz
3
88 MHz
1011_000
66/33 MHz
4/8
266 MHz
2
212MHz
2.5
106 MHz
1011_001
66/33 MHz
4/8
266 MHz
2.5
265 MHz
2.5
106 MHz
1011_010
66/33 MHz
4/8
266 MHz
3
318 MHz
2.5
106 MHz
1011_011
66/33 MHz
4/8
266 MHz
3.5
371 MHz
2.5
106 MHz
1011_100
66/33 MHz
4/8
266 MHz
4
424 MHz
2.5
106 MHz
Table 19.
Clock Configuration Modes in PCI Agent Mode
(1)
(Continued)
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