PDI1394P21 Datasheet, PDF (24/28 Pages) NXP Semiconductors – 3-port physical layer interface

Philips Semiconductors
3-port physical layer interface
Objective specification
PDI1394P21
The sequence of events for a null packet reception is as follows:
• Receive operation initiated. The PHY indicates a receive
operation by asserting receive on the CTL lines. Normally, the
interface is idle when receive is asserted. However, the receive
operation may interrupt a status transfer operation that is in
progress so that the CTL lines may change from status to receive
without an intervening idle.
• Data-on indication. The PHY asserts the data-on indication code
on the D lines for one or more cycles.
• Receive operation terminated. The PHY terminates the receive
operation by asserting Idle on the CTL lines. The PHY shall assert
at least one cycle of Idle following a receive operation.
SYSCLK
CTL0, CTL1
D0–D7
(a)
00
10
00
01
(b)
(c)
XX
FF (“data-on”)
00
SV01761
Figure 13. Null Packet Reception Timing
1999 Jul 09
24