Datasheet

TSB81BA3D, TSB81BA3DI

IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER

SLLS559E − DECEMBER 2002 − REVISED JUNE 2006

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION (1394B INTERFACE)

transmit (continued)

Table 36. Link Request Type Encoding During Packet Transmission

D1−D3 Request Type

000 No request

001 Isoch_Req_Odd

010 Isoch_Req_Even

011 Current

100 Next_Even

101 Next_Odd

110 Cyc_Start_Req

111 Reserved

Table 37. Link Request Speed Code Encoding During Packet Transmission

D5−D6 DATA RATE

00 S100

01 S200

10 S400

11 S800

Table 38. Link Request Format Encoding During Packet Transmission

D0 FORMAT

0 Link does not request either beta or legacy packet format for bus transmission

1 Link requests beta packet format for bus transmission

Table 39. Subaction End Notification Encoding During Packet Transmission

D4 DESCRIPTION

0 Transmitted packet does not represent end of a subaction

1 Transmitted packet marks the end of a subaction

The PHY indicates to the link during the GRANT cycle which type of grant is being issued. This indication

includes the grant type as well as the grant speed. The link uses the bus grant for transmitting the granted packet

type. The link transmits a granted packet type only if its request type exactly matches the granted speed and

the granted format.

Table 40. Format Type During Grant Cycle

D0 VALUE DURING GRANT

CYCLE

FORMAT

0 Unspecified

1 Beta format