T-8110L AGERE [Agere Systems], T-8110L Datasheet - Page 34
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T-8110L
Manufacturer Part Number
T-8110L
Description
Manufacturer
AGERE [Agere Systems]
Datasheet
1.T-8110L.pdf
(164 pages)
- Current page: 34 of 164
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Ambassador T8110L H.100/H.110 Switch
5 Operating Control and Status
5.1 Control Registers
5.1.6 Fallback Control Register (continued)
!
!
Table 21. Fallback Control Register
* The synchronized to frame command also has a diagnostic element—instead of performing the command right at the frame boundary,
5.1.7 Fallback Type Select Register
The upper nibble configures which H-bus clocks are selected to trigger a clock fallback event. Any of the legacy
modes have predetermined trigger enables and ignore the fallback trigger register settings. Nonlegacy modes
require the fallback trigger register settings. For more details, see Section 6.7.1 on page 64.
The lower nibble configures the state machine that controls clock register set active/inactive assignments. There
are three possible selections. For more details, see Section 6.7 on page 64.
!
!
!
34
Address
0x00108 Fallback Control
the user can elect to perform the command at a specified offset time from the frame boundary, by programming the Diag11 and Diag10
registers, 0x0014B—0x0014A.
FORCE_FALLBACK. Forces a state transition for active/inactive assignment of the clock register X and Y sets
by creating a fallback event. This command can either be performed immediately upon issue or can wait to be
performed until the next 8 kHz frame reference (synchronized to frame).
COPY ACTIVE TO INACTIVE SET. Copies all register values in the current active clock register set to the inac-
tive clock register set. This command is performed immediately upon issue.
Disabled. No transitions of clock register X and Y sets to active/inactive.
Fixed secondary. Swap the active/inactive sets on a fallback event; swap them back when fallback is cleared.
Rotating secondary. Swap the active/inactive sets on a fallback event; maintain this state when fallback is
cleared.
Byte
Name
(continued)
Bit(s) Mnemonic
7:0
FBCSR
(continued)
0000 0000
0000 0001
0000 0010
0000 0100
0001 0001
0001 0010
0001 0100
0010 0000
Value
NOP (default).
GO_CLOCKS command.
CLEAR_FALLBACK command.
FORCE_FALLBACK command.
GO_CLOCKS synchronized to frame*.
CLEAR_FALLBACK synchronized to frame*.
FORCE_FALLBACK synchronized to frame*.
COPY ACTIVE TO INACTIVE SET com-
mand.
Function
Agere Systems Inc.
February 2004
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