© 2006 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FIN12AC Rev. 1.1.0

11

STROBE Pass-Through Mode

For some applications, it is desirable to pass a word

clock across a differential signal pair in the opposite

direction of serialization. The FIN12AC supports this

mode of operation. Figure 5 in the application section

illustrates how to configure the devices for this mode.

The following describes how to enable this functionality.

For the deserializer:

1. DIRI = LOW

2. CKREF = LOW

3. Word clock should be connected to the STROBE.

This passes the STROBE signal out the CKSO port.

For the serializer:

1. Connect CKSO of the deserializer to CKSI of the

serializer.

2. CKSI passes the signal to CKP.

When PLL-bypass mode is used, the bit clock toggles on

the CKP signal.

Table 3. Control I/O

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:

Mode Number

DIRI

DIRO

CKSO

CKP

Mode of Operation

0

x

Z

Z

Z

Power Down Mode: S2 = 0, S1 = 0

1, 2, 3

0

1

CKSO = STROBE

Deserializer

Output STROBE

Deserializer: Any active mode

1, 2, 3

1

0

Serializer

Output Bit Clock

CKSI

Serializer: Any active mode