W233 Cypress Semiconductor Corp., W233 Datasheet - Page 7

• Manufacturer Part Number: W233
• Description: Spread Spectrum FTG For Via Mobile K7 Chipset
• Manufacturer: Cypress Semiconductor Corp.

Writing Data Bytes
Each bit in the data bytes controls a particular device function
except for the “reserved” bits, which must be written as a logic
0. Bits are written MSB (Most Significant Bit) first, which is bit
Table 4. Data Bytes 0–7 Serial Configuration Map
Document #: 38-07250 Rev. **
Data Byte 0
Data Byte 1
Data Byte 2
Data Byte 3
Bit(s)
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
Pin No.
29, 28
33, 32
42
40
41
15
12
11
10
22
23
27
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
9
8
5
4
Affected Pin
SEL_24MHz SEL 24MHz as the output fre-
SDRAM4:5
SDRAM2:3
24_48MHz
SDRAM_F
Pin Name
CPUC0_F
CPUT0_F
CPU_CS
48MHz
PCI_F
PCI6
PCI5
PCI4
PCI3
PCI2
PCI1
PCI0
--
--
--
--
--
--
--
--
--
--
--
--
--
--
(Reserved)
SEL_2
SEL_1
SEL_0
Hardware/Software Frequency
Select
SEL_4
SEL_3
(Reserved)
(Reserved)
(Reserved)
(Reserved)
(Reserved)
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
(Reserved)
quency for 24_48MHz
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
Clock Output Disable
PRELIMINARY
Control Function
7. Table 4 gives the bit formats for registers located in Data
Bytes 0–7.
Table 5 details additional frequency selections that are avail-
able through the serial data interface.
Hardware
24-MHz
Normal
High
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
--
--
--
--
--
--
--
0
See Table 5
See Table 5
See Table 5
See Table 5
See Table 5
Bit Control
Three-stated
Software
48-MHz
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
--
--
--
--
--
--
--
1
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Default
W233
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1