ST20-GP1 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20-GP1

GPS PROCESSOR

STMicroelectronics 

ST20-GP1

12.3 OS-Link connections

Links are TTL compatible and intended to be used in electrically quiet environments, between

devices on a single printed circuit board or between two boards via a backplane. Direct connection

may be made between devices separated by a distance of less than 300 mm. For longer distances

a matched 100 ohm transmission line should be used with series matching resistors (RM), see

Figure 12.3. When this is done the line delay should be less than 0.4 bit time to ensure that the

reflection returns before the next data bit is sent. Buffers may be used for very long transmissions,

see Figure 12.4. If so, their overall propagation delay should be stable within the skew tolerance of

the link, although the absolute value of the delay is immaterial.

OSLinkOut

OSLinkIn

OSLinkIn

OSLinkOut

Figure 12.2 OS-Links directly connected

OSLinkOut

OSLinkIn

RM

Zo=100 ohms

Zo=100 ohms

RM

OSLinkIn

OSLinkOut

Figure 12.3 OS-Links connected by transmission line

OSLinkOut

OSLinkIn

buffers

OSLinkIn

OSLinkOut

Figure 12.4 OS-Links connected by buffers

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