W83196S-14 데이터 시트보기 (PDF) - Winbond
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W83196S-14 Datasheet PDF : 15 Pages
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Preliminary W83196S-14
Set R/W to 1 when read back the data sequence is as follows:
Clock Address
A(6:0) & R/W
Ack
Byte 0
Ack
Byte 1
Ack
Byte2, 3, 4...
until Stop
7.3 Serial Control Registers
The Pin column lists the affected pin number and the @PowerUp column gives the state at true
power up. Registers are set to the values shown only on true power up. "Command Code" byte and
"Byte Count" byte must be sent following the acknowledge of the Address Byte. Although the data
(bits) in these two bytes are considered "don't care", they must be sent and will be acknowledge. After
that, the below described sequence (Register 0, Register 1, Register 2, ....) will be valid and
acknowledged.
Register 0 to Register 2 are referred to the Winbond SDRAM buffer(W83178S/179J) drivers.
7.3.1 Register 3: CPU Frequency Select Register (1 = Enable, 0 = Stopped)
BIT @POWERUP PIN
DESCRIPTION
7
0
-
Reserved
6
0
-
SSEL2 ( Frequency table selection by software via I2C)
5
0
-
SSEL1 ( Frequency table selection by software via I2C)
4
0
-
SSEL0 ( Frequency table selection by software via I2C)
3
0
-
0 = Selection by SEL100/66#
1 = Selection by software I2C - Bit 6:4 and Register 7 Bit0
2
0
-
Reserved
1-0
00
-
Bit1 Bit0 (See Function Table)
00
Normal
01
Test Mode
10
±0.5% center type Spread Spectrum enabled
11
Tristate
(I) Default Frequency table selection by software via I2C (When Register 7 Bit 0 = 0 )
SSEL2
0
0
0
0
1
1
1
1
SSEL1
0
0
1
1
0
0
1
1
SSEL0
0
1
0
1
0
1
0
1
CPU, SDRAM (MHZ)
68.5
75
83.3
66.8
103
112
133.3
100
PCI (MHZ)
34.25
37.5
41.6
33.4
34.25
37.3
44.43
33.3
REF2X (MHZ)
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
-6-
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