T-8110L AGERE [Agere Systems], T-8110L Datasheet - Page 38

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

Ambassador T8110L H.100/H.110 Switch
5 Operating Control and Status
5.1 Control Registers
5.1.11 Failsafe Control Registers
Table 26. Failsafe Control Register
The failsafe control register controls a return from the failsafe state. Writes to the failsafe control register trigger the
corresponding action, and the set bit(s) are automatically cleared. From the failsafe state, the user can return to
either the primary or secondary clock register sets. For more on failsafe, please see Section 6.7.2 on page 70.
The failsafe enable register controls the enable/disable of failsafe operation. For more on failsafe operation, please
see Section 6.7.2 on page 70.
The failsafe sensitivity register allows the failsafe watchdog timer to be desensitized by either 1, 4, 8, or 16 watch-
dog sample clock periods.
The OOL threshold registers allow for programmable threshold times which indicate the APLL1 out-of-lock. Reso-
lution for the threshold value increments is one 32.768 MHz clock period (30.5 ns). The register contains
[count – 1], a value of 0x0000 yields a 30.5 ns threshold. A value of 0xFFFF yields a 1.99 ms threshold. For more
on OOL operation, please see Section 6.7.2 on page 70.
The OOL monitor register allows the user to monitor either the raw APLL1 out-of-lock status, OR the status flag
that indicates that the APLL1 has been out-of-lock for more than the threshold defined in the OOL threshold regis-
ters.
38
Address
0x0011A OOL Monitor
0x00114
0x00115
0x00116
0x00118
0x00119
Byte
Failsafe Control
Failsafe Enable
Failsafe Sensitivity
OOL Threshold Low
OOL Threshold High
Name
(continued)
Bit(s) Mnemonic
7:0
7:0
7:0
7:0
7:0
7:0
(continued)
OOLER
FSCSR
FSEER
FSSSR
OLHLR
OLLLR
0000 0000
0000 0001
0000 0010
0000 0001
0000 0001
0000 0010
0000 0100
0000 1000
LLLL LLLL Failsafe threshold value, low byte.
LLLL LLLL Failsafe threshold value, high byte.
0000 0001
0000 0000
0000 0000
0000 0000
Value
NOP (default).
Return from failsafe to nonfallback condition.
Return from failsafe to fallback condition.
Failsafe disabled.
Failsafe enabled.
Failsafe watchdog highest sensitivity.
Failsafe watchdog + 30.5 ns.
Failsafe watchdog + 121.0 ns.
Failsafe watchdog + 244.0 ns.
Failsafe watchdog + 488.0 ns.
Monitor direct APLL1 lock detect at PLOCK.
Monitor user threshold lock detect at PLOCK.
Function
Agere Systems Inc.
February 2004