pdi1394p25 NXP Semiconductors, pdi1394p25 Datasheet - Page 36

• Manufacturer Part Number: pdi1394p25
• Description: 1-port 400 Mbps Physical Layer Interface
• Manufacturer: NXP Semiconductors

1. Normal operation. Interface is operating normally, with LPS
2. LPS deasserted. The LLC deasserts the LPS signal and, within
3. Interface reset. After T
Philips Semiconductors
The sequence of events for resetting the PHY-LLC interface when it
is in the nondifferentiated mode of operation (ISO terminal is high) is
as follows:
2001 Sep 06
1-port 400 Mbps physical layer interface
asserted, SYSCLK active, status and packet data reception and
transmission via the CTL and D lines, and request activity via the
LREQ line. In the above diagram, the LPS signal is shown as a
non-pulsed level signal. However, it is permissible to use a
pulsed signal for LPS in a direct connection between the PHY
and LLC; a pulsed signal is required when using an isolation
barrier (whether of the Philips Bus Holder type or Annex J type).
1.0 ms, terminates any request or interface bus activity, places
its CTL and D outputs into a high-impedance state, and drives its
LREQ output low.
LPS is inactive, terminates any interface bus activity, and drives
its CTL and D outputs low. The PHY-LLC interface is now in the
reset state.
CTL0, CTL1
SYSCLK
D0 – D7
LREQ
LPS
ISO
LPS_RESET
(low)
T
LPSL
time, the PHY determines that
T
LPSH
(a)
Figure 22. Interface Disable, ISO Low
(b)
T
LPS_RESET
36
4. Interface restored. After the minimum T
If the LLC continues to keep the LPS signal deasserted, it requests
that the interface be disabled. The PHY disables the interface when
it observes that LPS has been deasserted for T
the interface is disabled, the PHY sets its CTL and D outputs as
stated above for interface reset, but also stops SYSCLK activity. The
interface is also placed into the disabled condition upon a hardware
reset of the PHY. The timing for interface disable is shown in
Figure 22 and Figure 23.
When the interface is disabled, the PHY will enter a low-power state
if none of its ports is active.
may again assert LPS active. (The minimum T
provides sufficient time for the biasing networks used in Annex J
type isolation barrier circuits to stabilize and reach a quiescent
state if the isolation barrier has somehow become unbalanced.)
When LPS is asserted, the interface will be initialized as
described below.
T
LPS_DISABLE
(c)
RESTORE
(d)
PDI1394P25
LPS_DISABLE
RESTORE
time, the LLC
Preliminary data
SV01812
interval
. When