T-8110L AGERE [Agere Systems], T-8110L Datasheet - Page 42

• Manufacturer Part Number: T-8110L
• Manufacturer: AGERE [Agere Systems]

Ambassador T8110L H.100/H.110 Switch
5 Operating Control and Status
5.2 Error and Status Registers
5.2.2 System Status
5.2.2.1 Clock Fallback Status Register
The upper nibble provides status indicators for clock fallback. FBFOB indicates whether the circuit is in a clock fall-
back state. FBSOP indicates which of five possible states the circuit is in; see Section 6.7.1 on page 64 for more
details.
The lower nibble provides status indicators related to the X and Y clock register set active/inactive assignments.
XYSOB indicates which of the clock register sets is active. The remaining bits indicate a pending status for
GO_CLOCKS, CLEAR_FALLBACK, and FORCE_FALLBACK commands issued (via the fallback control register,
0x00108), which are waiting for a frame sync.
Table 30. Fallback and Failsafe Status Register
42
Address
0x00124 Status 4, Clock Fallback
Byte
Status
Register Name
(continued)
Bit(s) Mnemonic Value
6:4
7
3
2
1
0
(continued)
GOPOB
FBSOP
XYSOB
CFPOB
FBFOB
FFPOB
000
001
010
100
101
011
111
0
1
0
1
0
1
0
1
0
1
Indicates not in fallback/failsafe state (default).
Indicates fallback/failsafe state.
Fallback state = INITIAL (default).
Fallback state = PRIMARY.
Fallback state = TO_PRIMARY.
Fallback state = SECONDARY.
Fallback state = TO_SECONDARY.
Failsafe state = FS_1.
Failsafe state = FS_2.
Clock register Y set is active, X is inactive.
Clock register X set is active, Y is inactive.
No GO_CLOCKS pending (default).
GO_CLOCKS pending, waiting for frame.
No CLEAR_FALLBACK pending (default).
CLEAR_FALLBACK pending, waiting for frame.
No FORCE_FALLBACK pending (default).
FORCE_FALLBACK pending, waiting for
frame.
Function
Agere Systems Inc.
February 2004