PC8245 datasheet(45/61 Pages) ATMEL

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PC8245

2171D–HIREL–06/04

PLL Configuration

The internal PLLs of the PC8245 are configured by the PLL_CFG[0:4] signals. For a

given PCI_SYNC_IN (PCI bus) frequency, the PLL configuration signals set both the

peripheral logic/memory bus PLL (VCO) frequency of operation for the PCI-to-memory

frequency multiplying and the PC603e CPU PLL (VCO) frequency of operation for mem-

ory-to-CPU frequency multiplying. The PLL configurations for the PC8245 is shown in

Table 16 and Table 17.

Table 16. PLL Configurations (266 and 300 MHz Parts)

Ref

PLL_ CFG

[0:4](10)(13)

266 MHz Part(9)

300 MHz Part(9)

Multipliers

PCI Clock

Input (PCI_

SYNC_IN)

Range(1)

(MHz)

Periph

Logic/

Mem Bus

Clock

Range

(MHz)

CPU Clock

Range

(MHz)

PCI Clock

Input

(PCI_

SYNC_IN)

Range(1)

(MHz)

Periph

Logic/Mem

Bus Clock

Range

(MHz)

CPU

Clock

Range

(MHz)

PCI to

Mem

(Mem

VCO)

Mem to

CPU

(CPU

VCO)

00000(12)

25 – 35(5)(16)

75 – 105

188 – 263

25 – 40(5)

75 – 120

188 – 300

3(2)

2.5(2)

00001(12)

25 – 29(5)

75 – 88

225 – 264

25 – 33(5)

75 – 99

225 – 297

3(2)

00010(11)

50(18) – 59(5)

50 – 59

225 – 266

50(18) –

66(1)

50 – 66

225 – 297

1(4)

4.5(2)

00011(11)(14)

50(4) – 66(1)

50 – 66

100 – 133

50(4) – 66(1)

50 – 66

100 – 133

1 (Bypass)

2(4)

00100(12)

25 – 46(4)

50 – 92

100 – 184

25 – 46(4)

50 – 92

100 – 184

2(4)

00101

Reserved

Note (20)

00110(15)

Bypass

00111(14)

60(6) – 66(1)

60 – 66

180 – 198

60(6) – 66(1)

60 – 66

180 – 198

1 (Bypass)

3(2)

01000(12)

60(6) – 66(1)

60 – 66

180 – 198

60(6) – 66(1)

60 – 66

180 – 198

1(4)

3(2)

01001(19)

45(6) – 66(1)

90 – 132

180 – 264

45(6) – 66(1)

90 – 132

180 – 264

2(2)

01010(12)

25 – 29(5)

50 – 58

225 – 261

25 – 33(5)

50 – 66

225 – 297

2(4)

4.5(2)

01011(19)

45(3) – 59(5)

68 – 88

204 – 264

45(3) – 66(1)

68 – 99

204 – 297

1.5(2)

3(2)

01100(12)

36(6) – 46(4)

72 – 92

180 – 230

36(6) – 46(4)

72 – 92

180 – 230

2(4)

2.5(2)

01101(19)

45(3) – 50(5)

68 – 75

238 – 263

45(3) – 57(5)

68 – 85

238 – 298

1.5(2)

3.5(2)

01110(12)

30(6) – 44(5)

60 – 88

180 – 264

30(6) – 46(4)

60 – 92

180 – 276

2(4)

3(2)

01111(19)

25(5)

263

25 – 28(5)

75 – 85

263 – 298

3(2)

3.5(2)

10000(12)

30(6) –

44(2)(5)

60 – 132

180 – 264

30(6) – 44(2)

60 – 132

180 – 264

3(2)

2(2)

10001(19)

25 – 26(5)

100 – 106

250 – 266

25 – 29(2)

100 – 116

250 – 290

4(2)

2.5(2)

10010(12)

60(6) – 66(1)

90 – 99

180 – 198

60(6) – 66(1)

90 – 99

180 – 198

1.5(2)

2(2)

10011(19)

Not Available

25(2)

100

300

4(2)

3(2)

10100(12)

26(6) – 38(5)

52 – 76

182 – 266

26(6) – 42(5)

52 – 84

182 – 294

2(4)

3.5(2)

10101(19)

Not Available

27(3) – 30(5)

68 – 75

272 – 300

2.5(2)

4(2)

10110(12)

25 – 33(5)

50 – 66

200 – 264

25 – 37(5)

50 – 74

200 – 296

2(4)

4(2)

10111(19)

25 – 33(5)

100 – 132

200 – 264

25 – 33(2)

100 – 132

200 – 264

4(2)

2(2)

11000(12)

27(3) – 35(5)

68 – 88

204 – 264

27(3) – 40(5)

68 – 100

204 – 300

2.5(2)

3(2)

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