MB86613S Datasheet, PDF (82/134 Pages) Fujitsu Component Limited. – IEEE1394 Open HCI Controller

Preliminary
6. PHY
6.1. Support of P1394a Standard Draft
MB86613S device supports the following functions in P1394a standard:
1) arbitration accelerate :
While the enab_accel bit of PHY register is set, arbitration can be started to transmit its own packet
after the minimum gap(MIN_IDLE_TIME) is detected.
2) fly by arbitration :
This packet is concatenated with its own packet to repeat the packet received at the child port. This
method enables the packet transmission without arbitration.
3) arbitrated short bus reset :
While the normal bus reset period takes 167ms, the period of this bus reset takes 1.3ms. This bus
reset can be executed by setting the ISBR bit of PHY register. PHY layer executes this bus reset
automatically when one of the following events occurs :
a) when a port that exceeds the connection monitored time (time set in the Connection Timeout
register) is detected.
b) when the port is disconnected from a child port.
c) when the bus reset is detected during data receive.
d) when the bus reset is detecting while monitoring the connection time (while counting the
Connection Timeout register’s counter).
4) PHY registers :
The chip contains the registers as listed in section 6.3.
5) connection hysteresis :
”connection” is detected only when a port connection that exceeds the time set in the
ConnectionTimeout register is detected. However, ”connection” is detected as soon as a bus reset
that exceeds the time set in the BusResetDetect register even if the connection detect time is still
within the connection timeout.
6) multi speed packet concatenate :
Multiple concatenating packets can be transmitted while enabling the enab_multi bit of PHY register.
The transfer speed of each packet can also be changed. This means the speed signaling operation is
performed for every packet to be transmitted. But, please note that you have to make sure not to
concatenate a packet with s100 rate after a packet with either s200 or s400 in order to keep the func
tional compatibility with IEEE1394- 1995 standard. For such a case, when a packet is transmitted in
s100 rate, please transmit the s100 packet and then concatenate the s200 or s400 packet.
7) ping packet :
It transmits the selfID packet after receiving a ping packet.
When it transmits a ping packet, it starts to count the time (in 50MHz) until the selfID packet is
received.
When an asynchronous packet is transmitted, it starts to count the time until the acknowledge is
received.
The counted time is stored in the timeStamp field of descriptor while ”p” flag of OUTPUT_LAST or
81