cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 211

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

A.1
28560-DSH-001-B
One-Second Pin
The CX28560 provides the system with a complete set of Management Information
Base (MIB) counters per channel in both the receive and transmit directions. Each
counter is 24 bits wide and saturates on reaching its maximum value.
The one-second pin is an input to the CX28560 that provides the boundaries of each
latching period. The system can choose to send a pulse on this pin at any (not
necessarily constant) interval. The maximum value a counter can take is 24’hFFFFFF.
This is sufficient for a minimum of one second’s worth of data on any legally
configured channel. This may suffice for longer time periods for low bit-rate
channels.
Example 1, the octet counter for a T1 channel.
Example 2, the octet counter for a 52 Mbps channel.
Appendix A: Counters
Mindspeed Technologies™
Advance Information
Amount of time counters will suffice = (maximum
value of counter) / (number of times the event
occurs per second)
Amount of time counter will suffice =
(24’hFFFFFF)/44736000*8 = 3 seconds
Amount of time counter will suffice =
(24’hFFFFFF)/6500000 = 2.58 seconds
A
-
1