GS2986 datasheet(23/41 Pages) SEMTECH

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GS2986 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

52134 - 3

July 2012

23 of 41

will only lock to the data rate selected in accordance with Table 4-7.

4.11 SD/HD Indication

The SD/HD signal indicates the output data rate of the device and can be connected to the

SD/HD input pin of dual slew rate cable drivers such as the GS2988.

When this signal is HIGH, the data rate is 270Mb/s. This signal is LOW for all other data rates.

This signal is also LOW when the device is operating in bypass mode (Auto-bypass and

User-bypass).

The SD/HD signal is LOW when the device is not locked.

4.12 Bypass Mode

In bypass mode, the GS2986 passes the data at the inputs, directly to the output. There are two

The BYPASS bit is an active-high signal which forces the GS2986 into bypass mode for as long

as the bit is asserted HIGH.

The AUTOBYPASS bit is an active-high signal that places the GS2986 into bypass mode only

when the PLL has not locked to a data rate.

Note that if BYPASS is HIGH, this will override the AUTOBYPASS functionality.

When the GS2986's PLL is not locked and BYPASS = LOW and AUTOBYPASS = LOW, the serial

digital output DDO/DDO will produce invalid data.

Table 4-7: Data Rate Indication/Selection Bit Pattern

SS[1:0]

Data Rate (Mb/s)

Reserved

1270

1485 or 1485/1.001

2970 or 2970/1.001

Table 4-8: Bypass Modes

Bypass

Autobypass

Device Operation

HIGH

Bypass Mode

LOW

HIGH

Bypass Mode if the PLL has not

locked to a data rate

LOW

Power-up default. Normal

Operation, part always tries to

lock to the incoming data

stream.

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