SBPH400-3 datasheet(11/43 Pages) STMICROELECTRONICS

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SBPH400-3

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If the request for transmit comes from the local link, then the arbitration control logic waits for

an appropriate gap (all interfaces Idle), and then (unless the request is an immediate request)

arbitrates as above.

The arbitration logic supports all the arbitration enhancements specified in IEEE P1394a:-

•

arbitrated reset (a short reset which is delayed until a subaction gap arbitration)

•

ack-accelerated arbitration (immediate arbitration after an ACK)

•

fly-by arbitration (concatenation of packets after a packet received from a child

port)

2.7

PHY packets

2.7.1 Link device interaction

The SBPH400 will forward to the link (if the PHY/Link interface is active) every PHY packet

received on the bus.

The SBPH400 will interpret every PHY packet which it receives from the local link device for

transmission on the bus (in addition to responding to every PHY packet received from the bus).

The SBPH400 will act on it in exactly the same way as if the packet was received from the bus.

2.7.2 Self-ID packet

The Self-ID packet has the following format:

Figure 2.2

Self-ID packet format

1 0

phy_ID

0 L

gap_cnt

pwr

logical inverse of first quadlet

rsv

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