Can The Rclav Signal Be Deasserted In The Middle Of A Cell Transfer During Cell-Level Handshaking; Does The Renbl_B Signal Perform The Same Operation In No Drop Mode (Dr In Gmr Register = 1) As In Octet Or Cell-Level Handshake Mode; What Is The Status Of The Tx7 To Tx0 Pins While The Tenbl_B Signal Is Inactive (High Level); An External Phy Device Is Connected To The Utopia Interface, But Controlled By An External Interface - NEC mPD98409 Q&A

Q.3.4

Can the RCLAV signal be deasserted in the middle of a cell transfer during cell-level handshaking?

A.3.4
Yes. The µ PD98409 does not fetch the data of Rx7 to Rx0 while the RCLAV signal is deasserted. When the
RCLAV signal is asserted again, it starts fetching Rx7 to Rx0 as valid data.
Reference: µ PD98409 User's Manual 4.3.1 (2) Receive interface
Q.3.5
Does the RENBL_B signal perform the same operation in No drop mode (DR in GMR register = 1) as in octet or
cell-level handshake mode?
A.3.5
Yes. For details of the operation, refer to 4.3.1 UTOPIA interface in the µ PD98409 User's Manual.
Reference: µ PD98409 User's Manual 4.3.1 (2) Receive interface
Q.3.6

What is the status of the Tx7 to Tx0 pins while the TENBL_B signal is inactive (high level)?

A.3.6
The Tx7 to Tx0 pins output 0.
Reference: µ PD98409 User's Manual 4.3.1 UTOPIA interface
Q.3.7
An external PHY device is connected to the UTOPIA interface, but controlled by an external interface. At this
time, is it necessary to use the PHY control interface of the µ PD98409?
A.3.7
It is all right not to use the PHY control interface of the µ PD98409. In this case, the PHINT_B and CD0 to CD7
pins must be externally pulled up. All other pins may be left open.
Reference: µ PD98409 User's Manual 4.3.2 PHY device control interface
CHAPTER 3 UTOPIA INTERFACE
Information S14769EJ1V0IF00
17