FIN24C_06 Datasheet, PDF (8/25 Pages) Fairchild Semiconductor – uSerDes™Low-Voltage 24-Bit Bi-Directional Serializer/Deserializer

Serializer Operation Mode (Continued)
Serializer Operation: (Figure 6),
DIRI = 1,
No CKREF
A third method of serialization can be accomplished with a free running bit clock
on the CKSI signal. This mode is enabled by grounding the CKREF signal and
driving the DIRI signal HIGH.
At power-up, the device is configured to accept a serialization clock from CKSI. If
a CKREF is received, the device enables the CKREF serialization mode. The
device remains in this mode even if CKREF is stopped. To re-enable this mode,
the device must be powered down and powered back up with “logic 0” on CKREF.
CKSI
DP[1:24] WORD n-1
STROBE
WORD n
DSO
CKS0
b1 b2 b3 b4 b5 b6 b7
b22 b23 b24 b25 b26
WORD n+1
b1 b2 b3
No Data
WORD n-1
No Data
WORD n
Figure 6. Serializer Timing Diagram Using Provided Bit Clock (No CKREF)
©2005 Fairchild Semiconductor Corporation
FIN24C Rev. 1.0.2
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