HDMP-1012 datasheet(33/42 Pages) HP

33 / 42 page

605

Figure 16. Full Duplex Configuration.

Appendix II: Link

Configuration Examples

This section shows some

application examples using the

HDMP-1012/1014 chipset. Refer

to I/O Definition for detailed

circuit-level interconnection.

This guide is intended to aid the

user in designing G-LINK into a

system. It provides the necessary

details of getting the system up,

without the detailed description of

the inner circuitry of the chip set.

The first section is a description

of the various configurations for

duplex and simplex operation.

The second section describes the

interface to both single frame and

double frame mode. Following

that is a section on the integrating

capacitor and power supply

bypassing recommendations.

Next is a guide to the various

types of electrical I/O

connections. The final section is a

discussion on TTL translations

and the use of a single positive

supply. Also included is a list of

the various options and their

definitions.

Duplex/Simplex

Configurations

The following describes the

common setups for the link. In all

cases, the DIN and LIN are

differential high speed lines, and

unused leads should be

terminated with 50

Ω AC coupled

to ground. Since the data stream

has no DC component, a coupling

cap of 0.1

µF is recommended for

the DIN and LIN inputs.

Full Duplex

Figure 16 shows HDMP-1012/

1014 in a full duplex configura-

tion connecting two bidirectional

(parallel) buses. Each end of the

link has a Tx and RX pair. The

receiver’s state machine outputs

(STAT0 and STAT1) are used to

control the status of the link.

Various options such as 16/20 bit

mode (M20SEL) and speed

selections (DIV0,DIV1) are

grouped together under the label

‘options’. A power-on reset is

available to the user to reset the

link during startup

Since the outputs STAT0 and

STAT1 are ECL levels, they can

be tied directly to the pins shown.

When the Tx has acquired lock to

the incoming STRBIN at the

frame rate, the LOCKED pin is

activated, which enables the Rx.

At this state, both STAT0 and

STAT1 are low, forcing the Tx to

send FF0, which is a square wave

pattern used by the remote Rx to

acquire frame lock. When the

local Rx has acquire frame lock,

STAT1 is set high to first turn off

its own frequency detector

(FDIS), then sets itself to active

mode (ACTIVE), and tells the

local Tx to send FF1 to signal the

remote Rx that the local pair is

ready. Likewise, when the remote

pair is ready, the local Rx will

Tx DATA

INTERFACE

DOUT

OPTIONS

Rx DATA

INTERFACE

DIN

LIN

Rx DATA

INTERFACE

LIN

DIN

Tx DATA

INTERFACE

LOUT

DOUT

POWER-ON

RESET

LOUT

POWER-ON

RESET

OPTIONS

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