GS2985 datasheet(7/45 Pages) SEMTECH

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GS2985 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

36663 - 5

July 2012

7 of 45

Proprietary & Confidential

1.2 Pin Descriptions

Table 1-1: GS2985 Pin Descriptions

Pin Number

Name

Type

Description

1, 3

DDI0, DDI0

Input

Serial Digital Differential Input 0.

HIF

Logic Input

Host interface selection pin. Active-low input. See Section 4.15.14.

4, 8, 12, 16, 32,

GND

Power

Connect to GND.

5, 7

DDI1, DDI1

Input

Serial Digital Differential Input 1.

6, 10, 24, 50, 54,

59, 64

N/C

No Connect

Do not connect.

9, 11

DDI2, DDI2

Input

Serial Digital Differential Input 2.

13, 15

DDI3, DDI3

Input

Serial Digital Differential Input 3.

RSVD

Reserved

Reserved pin. Do not connect to this pin.

17, 18

DDI_SEL[0:1]

Logic Input

Selects one of four serial digital input signals for processing. See

Section 4.4.

BYPASS

Logic Input

Bypasses the reclocker stage. See Section 4.12.

AUTOBYPASS

Logic Input

When HIGH, this pin automatically bypasses the reclocker stage when the

PLL is not locked to a supported rate. See Section 4.12.

AUTO/MAN

Logic Input

When set HIGH, the standard is automatically detected from the input

data rate.

VCC_VCO

Power

Most positive power supply connection for the internal

VCO section. Connect to a 3.3V supply with a 422

Ω resistor, or to a 2.5V

supply with a 267

Ω resistor.

VEE_VCO

Power

Most negative power supply connection for the internal

VCO section. Connect to GND.

25, 26

SS0, SS1

Bi-directional

When AUTO/MAN is HIGH, SS[1:0] are outputs displaying the data rate to

which the PLL has locked to.

When AUTO/MAN is LOW, SS[1:0] are inputs forcing the PLL to lock only to

the selected data rate.

See Table 4-8 from Section 4.10.

VDD_1P8

Power

External capacitor for internal 1.8V digital supply.

LOCKED

Output

Lock Detect status signal. HIGH when the PLL is locked.

LOS

Output

Loss Of Signal status. HIGH when the input signal is invalid.

VDD_DIG

Power

Most positive power supply connection for the digital core.

Connect to 3.3V or 2.5V.

VSS_DIG

Power

Most negative power supply for the digital core.

Connect to GND.

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