HDMP-1024 datasheet(21/40 Pages) HP

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Rx I/O Definition (cont’d.)

Name

Type

Signal

SMRST0*

I-TTL

State Machine Reset Inputs: Each of these active-low input pins

SMRST1*

reset the Rx state machine to the initial start-up state. This initiates

a complete PLL restart and handshake at both ends of the duplex

link. Normally, SMCRST0* is connected to a power-up reset circuit

or a host system reset signal. The SMCRST1* input is normally

connected to the Tx LOCKED output. The LOCKED signal holds the

state-machine in the start-up state until the Tx PLL is locked.

STAT0

O-TTL

State Machine Status Outputs: These outputs indicate the current

STAT1

state-machine state. They are used to directly control the Tx ED,

Tx FF, Rx FDIS, and Rx ACTIVE lines.

STRBOUT

O-TTL

Recovered Frame-rate Data Clock Output: This output is the PLL

recovered frame rate clock. D0-D19, FLAG, DAV, CAV, FF, LINKRDY,

and ERROR should all be latched on the rising edge of STRBOUT.

TCLK

I-TTL

External VCO Replacement Test Clock: When TCLKSEL in

enabled, this input is used in place of the normal VCO signal,

effectively disabling the PLL and allowing the user to provide an

external retiming clock for testing.

TCLKSEL

I-ECL

Enable Test Clock Input: When this input is active, the TCLK,

TCLK* inputs are used in place of the normal VCO signal. This

feature is useful both for synchronous systems and for chip testing.

VCC

Ground: Normally 5.0 volts. This power supply is used for all the

core logic other than the output drivers.

VCC_HS

High Speed Supply: Normally 5.0 volts. This ground is used to provide

clean references for the high speed DIN, DIN*, LIN, LIN* inputs.

VCCTTL

TTL Power Supply: Normally 5.0 volts. Used for all TTL receiver

output buffer cells.

GND

Power: Normally 0 volts. Tie to ground.

GNDTTL

TTL Power: Normally 0 volts. Tie to ground.

HDMP-1024 Datasheet(PDF) 21 Page - Agilent(Hewlett-Packard)

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