bt8970 Mindspeed Technologies, bt8970 Datasheet - Page 53

• Manufacturer Part Number: bt8970
• Description: Single-chip Hdsl Transceiver
• Manufacturer: Mindspeed Technologies

Bt8970
Single-Chip HDSL Transceiver
0x0C—Timer Restart Register (timer_restart)
Independent read/write restart bits, one for each of the eight internal timers. Setting an individual bit causes the
associated timer to be reloaded with the contents of its interval register. For the four symbol-rate timers (meter,
snr, t3, t4), reloading will occur within one symbol period. For the four start-up timers (sut1–4), reloading will
occur within 1,024 symbol periods. Once reloaded, the restart bit is automatically cleared. If a restart bit is set
and then cleared (by writing a logic zero) before the reload actually takes place, no timer reload will occur. Once
reloaded, if enabled in the Timer Enable Register [timer_enable; 0x0D], the timer will begin counting down
toward zero; otherwise, it will hold at the interval register value.
t4
t3
snr
meter
sut4
sut3
sut2
sut1
100101B
t4
7
General Purpose Timer 4
General Purpose Timer 3
SNR Alarm Timer
Meter Timer
Startup Timer 4
Startup Timer 3
Startup Timer 2
Startup Timer 1
t3
6
Preliminary Information/Conexant Proprietary and Confidential
snr
5
meter
4
Conexant
sut4
3
sut3
2
sut2
1
4.0 Register
sut1
0
4-9