FIN24C_06 Datasheet, PDF (12/25 Pages) Fairchild Semiconductor – uSerDes™Low-Voltage 24-Bit Bi-Directional Serializer/Deserializer

REFCK
Sending
Unit
DATA [0:23]
FIN24C
CKREF CKSO
STROBE
DS
DP[1:24]
FIN24C
CKSI
CKP
DS
DP[1:24] ^{DATA [0:23]}
V_DD
DIRI
S1
S2
DIRO
DIRO
DIRI
S1
S2
PwrDwn
Figure 12. 24-Bit Unidirectional Serializer and Deserializer
Receiving
Unit
REFCK
Control
Unit
CNTL[0:3]
DATA [0:19]
PwrDwn
FIN24C
CKREF CKSO
STROBE
DS
DP[21:24]
DP[1:20] _CKSI
S2
S1
DIRI
DIRO
FIN24C
CKSI
CKP
STROBE
DS _DP[21:24]
DP[1:20]
CKSO
S2
CNTL[0:3]
DATA [0:19]
DIRI
S1
DIRO
Slave
Unit
Figure 13. Unidirectional Control, Bi-directional Data Interface
Flex Circuit Design Guidelines
The serial I/O information is transmitted at a high serial rate. Care must be taken implementing this serial I/O flex
cable. The following best practices should be used when developing the flex cabling or Flex PCB:
■ Keep all four differential wires the same length.
■ Allow no noisy signals over or near differential serial wires. Example: No LVCMOS traces over differential wires.
■ Use only one ground plane or wire over the differential serial wires. Do not run ground over top and bottom.
■ Do not place test points on differential serial wires.
■ Use differential serial wires a minimum of 2cm away from the antenna.
©2005 Fairchild Semiconductor Corporation
FIN24C Rev. 1.0.2
12
www.fairchildsemi.com