
Agere Systems Inc.
87
Data Sheet
May 2001
and Packet Payload Engine
Ambassador T8110 PCI-Based H.100/H.110 Switch
7 Clock Architecture
(continued)
Table 65. H-Bus Clock Enable State Description
H-Bus Clock
Enable State
INITIAL
Description
Exit To
Exit Condition
Initial condition, waiting for clock
output control register program-
ming.
T8110 is driving all H-bus clocks
(diagnostic mode).
T8110 is driving both the H-bus A
and B clocks (diagnostic mode).
T8110 is driving only the
H-bus C clocks.
T8110 clock output control registers
are programmed to drive A clocks
and C clocks (T8110 is an A clock
master), or T8110 was supplying a
backup A clock and has been pro-
moted to A clock master.
T8110 clock output control registers
are programmed to drive A clocks
only (T8110 is a B clock slave, and
supplies a backup A clock).
Any of the
other states
User update of the clock output control regis-
ter (0x00220, master output enables).
DIAG_ABC
INITIAL
User update of the clock output control regis-
ter (0x00220, master output enables).
User update of the clock output control regis-
ter (0x00220, master output enables).
User update of the clock output control regis-
ter (0x00220, master output enables).
A clock error on CT_C8_A or /CT_FRAME_A
is detected; disable clock outputs.
User update of the clock output control regis-
ter (0x00220, master output enables).
DIAG_AB
INITIAL
C_ONLY
INITIAL
A_MASTER
A_ERROR
INITIAL
A_ONLY
A_MASTER A clock error on CT_C8_B or /CT_FRAME_B
is detected; promote to A clock master.
A_ERROR
A clock error on CT_C8_A or /CT_FRAME_A
is detected; disable clock outputs.
INITIAL
User update of the clock output control regis-
ter (0x00220, master output enables).
INITIAL
User update of the clock output control regis-
ter (0x00220, master output enables).
A_ERROR
T8110 has detected a clock error
while driving the A clocks, and has
stopped driving any H bus clocks.
T8110 clock output control registers
are programmed to drive B clocks
and C clocks (T8110 is a B clock
master),
or
T8110 was supplying a
backup B clock and has been pro-
moted to B clock master.
T8110 clock output control registers
are programmed to drive B clocks
only (T8110 is an A clock slave, and
supplies a backup B clock).
B_MASTER
B_ERROR
A clock error on CT_C8_B or /CT_FRAME_B
is detected; disable clock outputs.
User update of the clock output control regis-
ter (0x00220, master output enables).
INITIAL
B_ONLY
B_MASTER A clock error on CT_C8_A or /CT_FRAME_A
is detected; promote to B clock master.
B_ERROR
A clock error on CT_C8_B or /CT_FRAME_B
is detected; disable clock outputs.
INITIAL
User update of the clock output control regis-
ter (0x00220, master output enables).
INITIAL
User update of the clock output control regis-
ter (0x00220, master output enables).
B_ERROR
T8110 has detected a clock error
while driving the B clocks, and has
stopped driving any H bus clocks.