CY28378 Cypress Semiconductor, CY28378 Datasheet - Page 7

• Manufacturer Part Number: CY28378
• Description: FTG for Pentium 4 and Intel 845 Series Chipset
• Manufacturer: Cypress Semiconductor

Document #: 38-07519 Rev. **
Byte 2
Byte 3
Byte 4
Byte 5
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit
Bit
Bit
Bit
@Pup
@pup
@Pup
@Pup
HW
HW
HW
HW
HW
HW
HW
1
1
1
0
1
0
1
1
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
PCI_F2
PCI_F1
PCI_F0
Reserved
CPU_ITP, CPU_ITP#
Reserved
REF1
REF0
Reserved
PCI6
PCI5
PCI4
PCI3
PCI2
PCI1
PCI0
Reserved
Reserved
Reserved
Reserved
MULTSEL_Override
SW_MULTSEL1
SW_MULTSEL0
Reserved
Latched FS4 input
Latched FS3 input
Latched FS2 input
Latched FS1 input
Latched FS0 input
FS_Override
SEL 3V66
SEL 48MHZ
Name
Name
Name
Name
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
Reserved
(Active/Inactive)
Reserved
(Active/Inactive)
(Active/Inactive)
Reserved
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
This bit control the selection of IREF multiple.
0 = HW control; IREF multiplier is determined by MULTSEL[0:1] input pins
1 = SW control; IREF multiplier is determined by Byte[4], Bit[5:6].
IREF multiplier
00 = Ioh is 4 x IREF
01 = Ioh is 5 x IREF
10 = Ioh is 6 x IREF
11 = Ioh is 7 x IREF
Reserved
Reserved
Reserved
Reserved
Vendor Test Mode (always program to 0)
Latched FS[4:0] inputs. These bits are read only.
0 = Select operating frequency by FS[4:0] input pins
1 = Select operating frequency by SEL[4:0] settings
0 = 48-MHz output on pin 27, 1 = 66-MHz output on pin 27
0 = 24-MHz,1 = 48-MHz
Pin Description
Pin Description
Pin Description
Pin Description
CY28378
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