HDMP-1024 datasheet(20/40 Pages) HP

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635

Rx I/O Definition (cont’d.)

Name

Type

Signal

ERROR

O-TTL

Received Data Error: Asserted when a frame is received that does

not correspond to either a valid Data, Control, or Fill frame encoding.

When FLAGSEL is not active, the Rx chip also tests for strict

alternation of flag bits during data frames. A flag bit alternation

error will also cause an ERROR indication.

FDIS

I-TTL

Frequency Detector Disable Input: When active, this input

disables the Rx PLL Frequency detector and enables a phase detector.

The Frequency detector is used during the start-up sequence to

acquire wide-band lock on Fill Frames, but must be disabled prior to

sending data patterns. This input is normally controlled by the Rx

state machine.

O-TTL

Fill Frame Status: During a given STRBOUT clock cycle, if neither

DAV, CAV, or ERROR are active, then the currently received frame

is a Fill frame. The type of fill frame received is indicated by the FF

pin. If FF is low, then FF0 has been received. If FF is high, then

either FF1a or FF1b has been received.

FLAG

O-TTL

Flag Bit: If both Tx and Rx have FLAGSEL asserted, this output

indicates the value of the transmitted flag bit, then this received bit

can be treated just like an extra data bit. If both Tx and Rx have

FLAGSEL set to low, FLAG is used to differentiate the even frame

from the odd frame in the line code.

FLAGSEL

I-TTL

Flag Bit Mode Select: When this input is high, the extra FLAG bit

output is effectively an extra transparent data bit. Otherwise, the

FLAG bit is checked for alternation during data frames. Any break in

strict alternation results in an ERROR indication to the user.

LIN

I-H50

Loop Back Serial Data Input: Use this input when LOOPEN is

LIN*

active. Unlike the DIN, DIN* inputs, this input does not have a cable

equalizer. In normal usage, this input will be connected to the Tx

chip LOUT, LOUT* outputs. This allows the user to check the

near-end functionality of the Tx and Rx pair independent of the

transmission medium.

LOOPEN

I-TTL

Loop Back Control: When asserted, this signal causes the loop back

data inputs LIN, LIN* to be used instead of the normal data inputs

DIN, DIN*.

LINKRDY*

O-TTL

Link Ready Indicator: This active-low output is a retimed version

of the ACTIVE input. ACTIVE is normally driven by the Rx state

machine output. LINKRDY* then indicates that the startup sequence

is complete and that the data and control indications are valid.

M20SEL

I-TTL

16 or 20 Bit Word Select: When this signal is high, the link operates

in 20 Bit data reception mode. Otherwise, the link operates in 16 Bit

mode and data outputs D16-D19 are undefined.

TEMP

Temperature Sense Diode: Used during wafer and package test

TEMP*

only. It should be left open.

HDMP-1024 Datasheet(PDF) 20 Page - Agilent(Hewlett-Packard)

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