Philips Semiconductors

Preliminary data

PDI1394P23

2-port/1-port 400 Mbps physical layer interface

2001 Sep 06

10

The LPS input is considered inactive if it remains low for more than

2.6

detects that LPS is inactive, it will place the PHY-LLC interface into a

low-power reset state in which the CTL and D outputs are held in the

logic zero state and the LREQ input is ignored; however, the

SYSCLK output remains active. If the LPS input remains low for

more than 26

µs, the PHY–LLC interface is put into a low-power

disabled state in which the SYSCLK output is also held inactive. The

PHY-LLC interface is also held in the disabled state during hardware

reset. The PDI1394P23 will continue the necessary repeater

functions required for normal network operation regardless of the

state of the PHY-LLC interface. When the interface is in the reset or

disabled state and LPS is again observed active, the PHY will

initialize the interface and return it to normal operation.

The PHY uses the C/LKON terminal to notify the LLC to power up

and become active. When activated, the C/LKON signal is a square

wave of approximately 163 ns period. The PHY activates the

C/LKON output when the LLC is inactive and a wake-up event

occurs. The LLC is considered inactive when either the LPS input is

inactive, as described above, or the LCtrI bit is cleared to 0. A

wake-up event occurs when a link-on PHY packet addressed to this

node is received, or conditionally when a PHY interrupt occurs. The

PHY deasserts the C/LKON output when the LLC becomes active

(both LPS active and the LCtrl bit set to 1). The PHY also deasserts

the C/LKON output when a bus-reset occurs unless a PHY interrupt

condition exists which would otherwise cause C/LKON to be active.

8.0

In accordance with the Absolute Maximum Rating System (IEC 134). Voltages are referenced to GND (ground = 0 V).

SYMBOL

PARAMETER

CONDITION

LIMITS

UNIT

SYMBOL

PARAMETER

CONDITION

MIN

MAX

UNIT

DC supply voltage

–0.5

4.0

V

DC input voltage

–0.5

V

5 volt tolerant input voltage range

–0.5

5.5

V

DC output voltage range at any output

–0.5

V

Electrostatic discharge

Human Body Model

—

2

kV

Electrostatic discharge

Machine Model

—

200

V

Operating free-air temperature range

0

+70

°C

Storage temperature range

–65

+150

°C

NOTE:

1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating

Conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.