FS6159-01 데이터 시트보기 (PDF) - AMI Semiconductor
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FS6159-01 Datasheet PDF : 15 Pages
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FS6159-01
Auxiliary Motherboard Clock Generator/Buffer IC
Table 7: Byte Count
BYTE COUNT
0000 0000
0000 0001
0000 0010
0000 0011
0000 0100
0000 0101
0000 0110
to
0001 1111
0010 0000
DESCRIPTION
Not allowed: Must have at least one byte
Writes one byte (Byte 0)
Writes two bytes (Byte 0, 1 in order)
Writes three bytes (Byte 0, 1, 2 in order)
Writes four bytes (Byte 0, 1, 2, 3 in order)
Writes five bytes (Byte 0, 1, 2, 3, 4 in order)
These byte counts are ignored by this device
Maximum byte count supported (32)
After an acknowledge of the byte count, data bytes may
be written starting with Register 0 and incrementing se-
quentially. An acknowledge by this device between each
byte of data must occur before the next data byte is sent.
3.2 Block Read
The Block Read command, shown in Figure 3, permits
the host to read several bytes of data from sequential
registers, starting by default at Register 0. To perform a
Block Read procedure, the seven-bit device address is
sent, followed by a logic-high R/W bit.
Following an acknowledgement of the byte count by the
bus host, this device will take command of the bus and
will transmit all the data beginning with Register 0. After
the last byte of data, the host does not acknowledge the
final transfer but instead generates a STOP command. If
a NO-acknowledge does not occur, the device releases
the bus and the bus host will read all ones.
If the host does not want to receive all the data, the host
should not acknowledge the last data byte and instead
issue a STOP command on the next clock.
Figure 2: Block Write
S DEVICE ADDRESS W A
A BYTE COUNT = N A
DATA BYTE 1
A
DATA BYTE N
AP
7-bit Receive
Device Address
Command Code
Acknowledge
START
Command
WRITE Command
From bus host
to device
Byte Count
Acknowledge
From device
to bus host
Data
Acknowledge
Figure 3: Block Read
S DEVICE ADDRESS R A BYTE COUNT = N A
DATA BYTE 1
A
Acknowledge
Data
Acknowledge
STOP Command
DATA BYTE N
AP
7-bit Receive
Device Address
Repeat START
Byte Count
Acknowledge
READ Command
From bus host
to device
Data
Acknowledge
Acknowledge
From device
to bus host
Data
NO Acknowledge
STOP Command
ISO9001
2.27.02
4
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