CY28404
Byte 8: Control Register 8
Bit
7
6
5
@Pup
0
1
1
CPU
PCIF
PCI
3V66
Name
Description
Spread Spectrum Selection
‘000’ = ±0.20% triangular
‘001’ = + 0.12, – 0.62%
‘010’ = + 0.25, – 0.75%
‘011’ = –0.05, – 0.45% triangular
‘100’ = ± 0.25%
‘101’ = + 0.00, – 0.50%
‘110’ = ± 0.5%
‘111’ = ± 0.38%
SW Frequency selection bits. See
Table 2.
4
3
2
1
0
0
0
0
0
0
FSEL_4
FSEL_3
FSEL_2
FSEL_1
FSEL_0
Byte 9: Control Register 9
Bit
7
6
5
4
3
2
1
0
0
0
0
1
1
1
0
0
@Pup
PCIF
PCI
3V66
REF
24_48MHz
REF_2
Reserved
Reserved
Name
Description
PCIF Clock Output Drive Strength Control
0 = Low Drive strength, 1 = High Drive strength
PCI Clock Output Drive Strength
0 = Low Drive strength, 1 = High Drive strength
3V66 Clock Output Drive Strength
0 = Low Drive strength, 1 = High Drive strength
REF Clock Output Drive Strength
0 = Low Drive Strength, 1 = High Drive Strength
24_48MHz Output Enable
0 = Disabled, 1 = Enabled
REF_2 Output Enable0 = Disabled, 1 = Enabled)
Reserved, set = 0
Reserved, set = 0
Byte 10: Control Register 10
Bit
7
6
@Pup
0
0
Name
PCI_Skew1
PCI_Skew0
PCI skew control
00 = Normal
01 = –500 ps
10 = Reserved
11 = +500 ps
3V66 skew control
00 = Normal
01 = –150 ps
10 = +150 ps
11 = +300 ps
Reserved, Set = 1
Reserved, Set = 1
Reserved, Set = 1
Reserved, Set = 1
Description
5
4
0
0
3V66_Skew1
3V66_Skew0
3
2
1
0
1
1
1
1
Reserved
Reserved
Reserved
Reserved
Rev 1.0, November 22, 2006
Page 8 of 19
SPECTRALINEAR [ SPECTRALINEAR INC ]
