RS8973 Mindspeed Technologies, RS8973 Datasheet - Page 45

• Manufacturer Part Number: RS8973
• Description: Single-chip Sdsl/hdsl Transceiver
• Manufacturer: Mindspeed Technologies

RS8973
Single-Chip SDSL/HDSL Transceiver
2.5.7 Scratch Pad Memory
N8973DSD
Table 2-6. Timers
single prescaler, which divides the symbol clock by 1024 and supplies this slow
clock to the four counters. The timers are Startup Timer 1, Startup Timer 2,
Startup Timer 3, and Startup Timer 4. Each one is independent, with separate
interval timer values and interrupts.
Alarm Timer and the Meter Timer. The SNR Alarm Timer is used only by the low
SNR, while the Meter Timer is used by all other meters, excluding the low SNR
meter. Their respective interrupts are set when each of these two timers expires.
There are no prescalers for these timers; they count at the symbol rate. Both
timers are normally used in the continuous mode.
and General Purpose Timer 4. There are no prescalers for these timers; they count
at the symbol rate. Each timer signals an interrupt when it expires.
The scratch pad memory consists of 64 bytes of RAM available to the external
microcomputer. This is used by Conexant-supplied software to minimize system
memory requirements.
General Purpose Timer 3
General Purpose Timer 4
Four timers are provided for use in timing start-up events. These timers share a
Two timers control the measurement intervals for the various meters: the SNR
Two identical timers are provided for general use: General Purpose Timer 3
SNR Alarm Timer
Startup Timer 1
Startup Timer 2
Startup Timer 3
Startup Timer 4
Timer Name
Meter Timer
Preliminary Information
Conexant
SNR Measurement
Startup Events
Startup Events
Startup Events
Startup Events
Miscellaneous
Miscellaneous
Measurement
Purpose
Symbol rate
Symbol rate
Symbol rate
Symbol rate
Symbol rate
Symbol rate
Symbol rate
Symbol rate
Clock Rate
2.0 Functional Description
2.5 Microcomputer Interface
1024
1024
1024
1024
Control Bits
meter
sut 1
sut 2
sut 3
sut 4
snr
t3
t4
2-21