Datasheet

Data-Mover Port Interface

SGLS139B − October 2003 − Revised April 2004TSB12LV32-EP

5.1.1.1 Isochronous Packet Receive With Automatic Header and Trailer Removal

Step 1: Isochronous packet is received through the receiver logic of the link core.

Step 2: The packet header is stripped off from the packet and loaded into the header0 register at 38h.

Step 3: Packet data (payload only) is routed directly to the DM port without any buffering.

Step 4: Trailer quadlet is loaded into the trailer register at 48h.

CFR REGISTER

Step 1

Data-

Mover

Port

Header0 Register at 38h

Trailer Register at 48h

LINK CORE

Transmitter

Receiver

Step 2

Step 4

Step 3 (Packet Data)

Packet Received From

1394 Bus Through the Phy

Figure 5−5. Isochronous Receive With Auto Header and Trailer Removal

5.1.1.2 Isochronous Packet Receive With Header and Trailer

Step 1: Isochronous packet is received through the receiver block of the link core.

Step 2: The header quadlet is both loaded into the header0 register at 38h and routed to the DM port without

any buffering.

Step 3: Packet data (payload only) is sent directly through the DM port only.

Step 4: Trailer quadlet is loaded into the trailer register at 48h. It is also forwarded to the DM port.