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UPD72850A

IEEE1394 400Mbps PHY

NEC => Renesas Technology 

µPD72850A

4. PHY/LINK INTERFACE

4.1 Initialization of Link Power Status (LPS) and PHY/Link Interface

The LPS pin monitors the On/Off status of the Link power state. This pin is used during the PHY/Link interface

Enable/Disable (initialization).

Reset

When the LPS input pin is Low for TLPS_RESET:

• CTL0,CTL1 and D0-D7 output Low (When the isolation barrier is Hi-Z).

• SCLK continuously supplies the clock signal to the Link.

Disable

When the LPS input pin is Low for TLPS_DISABLE:

• CTL0,CTL1, D0-D7 continue to output Low as TLPS_RESET has already occurred (When the isolation barrier is Hi-Z).

• SCLK to Link stops and it outputs Low (When the isolation barrier is Hi-Z).

Table 4-1. LPS Timing Parameters

Parameter

LPS = Low propagation delay (with isolation barrier)

LPS = High propagation delay (with isolation barrier)

Reset active

Disable active

Setup time when using isolation barrier

Symbol

tLPSL

tLPSH

tLPS_RESET

tLPS_DISABLE

tRESTORE

MIN.

MAX.

Unit

0.09

1.00

µs

0.09

1.00

µs

1.2

2.75

µs

25

30

µs

15

20

µs

Figure 4-1. LPS Waveform when Connected to Isolation Barrier

tLPSH

tLPSL

Data Sheet S14452EJ1V0DS00

21

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