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FIN12AC 데이터시트(PDF) 7 Page - Fairchild Semiconductor

부품명 FIN12AC
상세설명  Low-Voltage 12-Bit Bi-Directional Serializer/Deserializer with Multiple Frequency Ranges
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FIN12AC Rev. 1.1.2
7
LVCMOS Data I/O
The LVCMOS input buffers have a nominal threshold
value equal to half VDDP. The input buffers are only
operational when the device is operating as a serializer.
When the device is operating as a deserializer, the inputs
are gated off to conserve power.
The LVCMOS 3-STATE output buffers are rated for a
source / sink current of 2mA at 1.8V. The outputs are
active when the DIRI signal is asserted LOW. When the
DIRI signal is asserted HIGH, the bi-directional LVCMOS
I/Os are in HIGH-Z state. Under purely capacitive load
conditions, the output swings between GND and VDDP.
Figure 3.
LVCMOS I/O
Application Mode Diagrams
Modes 1, 2, 3: Unidirectional Data Transfer
Figure 4. Simplified Block Diagram for Unidirectional Serializer and Deserializer
Figure 4. shows basic operation when a pair of µSerDes is configured in an unidirectional operation mode.
Master Operation:
1. During power-up, the device is configured as a
serializer based on the value of the DIRI signal.
2. The device accepts CKREF_M word clock and gen-
erates a bit clock, which is sent to the slave device
through the CKSO port.
3. The device receives parallel data on the rising edge
of STROBE_M.
4. The device generates and transmits serialized data
on the DS signals, which is source synchronous with
CKSO.
5. The device generates an embedded word clock for
each strobe signal.
Slave Operation:
1. The device is configured as a deserializer at power-
up based on the value of the DIRI signal.
2. The device accepts the bit clock on CKSI.
3. The device deserializes the DS data stream using the
CKSI input clock.
4. The device writes parallel data onto the DP_S port
and generates the CKP_S only when a valid data
word occurs.
From
Deserializer
To
Serializer
From
Control
DP[n]
+
+
+
+
CKREF_M
CKSO
CKSI
CKP_S
DP[1:12]_S
Serializer
Control
BIT CK
Gen.
PLL
Master Device Operating as a Serializer
DIR = “1”
Slave Device Operating as a Deserializer
DIR = “0”
Deserializer
Control
Work CK
Gen
Serializer
Deserializer
DS
STROBE_M
DP[1:12]_M


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