cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 213

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

CX28560 Data Sheet
A.3
A.3.1
A.3.1.1
28560-DSH-001-B
Counter Descriptions
Receive Counters
In the receive direction, the following counters are provided per channel:
Multiple Errors on A Single Message
Each message is only counted once according to the following priority:
That is to say, a message containing both an FCS error and alignment error is counted
only once in the Alignment Error counter.
• Octet counter:
• Message counter:
• Alignment Error counter:
• FCS Error counter:
• Abort Condition counter:
• Too Long counter:
• Too Short counter:
1.
2.
3.
4.
5.
– A count of all octets received for this channel. This count does not include
– A count of all non-errored messages received for a channel. An errored
– A count of all messages that arrive containing an alignment error. An
– A count of all messages that arrive containing an FCS error.
– A count of all messages that arrive ending in an abort condition. In this
– A count of all messages that arrive that are longer than the maximum
– A count of all messages that are considered too short. A short message is a
Abort condition
Too long message
Message alignment error
FCS error
No error occurs
HDLC flags, abort sequences, or idle codes. The count does include FCS
bytes and message data of all messages received including errored
messages.
message would either fall into one of the categories below, or have been
discarded mid-message due to local conditions (i.e., due to a COFA or OOF
condition being detected or an internal FIFO overflow occurring). Errored
messages that are not discarded due to local conditions are counted in the
counters below.
message containing an alignment error is defined as a message that, after
removal of HDLC flags and HDLC zero insertions, contains a number of
bits not divisible by eight.
case, an abort condition is considered to be seven consecutive ones.
length. The maximum length of a received message can be adjusted by
selecting one of three 14-bit registers that define a limit for the maximum
number of bytes allowed in the message.
message with less than the minimum of an 8-bit payload between two flags
(e.g., at least 3 message bytes must be received in 16-bit FCS). Too short
also includes errors such as Abort, COFA, OOF, Alignment and FCS in the
case that no data had yet been transferred to the Buffer Controller from the
RSLP.
Mindspeed Technologies™
Advance Information
Counters
A
-
3