cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 160

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

3.0 Registers
3.9 Receiver Registers
3.9 Receiver Registers
RAMI
RABORT
RFORCE
3-38
040—Receiver Configuration (RCR0)
RLOFD–RLOFA
RAMI
7
Receive AMI Encoded Inputs—Disables B8ZS/HDB3 decoding for AMI formatted receive
signals. Otherwise, ZCS decoder replaces 000VB0VB code (B8ZS) with 8 zeros in T1 mode
or replaces X00V code (HDB3) with 4 zeros in E1 mode: where B is a normal AMI pulse, V is
a bipolar violation, and X is a “don't- care.” Regardless of RAMI setting, receipt of a ZCS
signature is always detected and reported in ZCSUB status [RSTAT; addr 021].
Abort/Disable RX Offline Framer—When set, the offline framer ignores reframe requests
from the online framer (RLOF) and aborts any in-progress RLOF reframe request. Loss of
frame status [RLOF; addr 047] is not affected. While RABORT remains set, offline framer
responds only to processor forced reframes (RFORCE). This allows the processor to manually
control reframe criteria and prevent changes in the current receive frame alignment. RABORT
is typically set only during unframed operation.
Force RX Reframe—Forces the offline framer to perform a single reframe according to
selected receive framer mode. RFORCE is automatically cleared when offline framer
acknowledges the request [FSTAT; addr 017]. The processor does not typically need to force
reframe since the online framer reframe request (RLOF) is active whenever reframe criteria
(RLOFD–A) is met. However, the processor may force reframe if frame or CRC error ratios
indicate that the framer might have aligned to a duplicated frame alignment pattern.
RX Reframe Criteria—Determines the number of frame errors that the online framer must
detect before declaring loss of frame alignment [ALM1; addr 047]. Refer to receive framer
mode [RFRAME; addr 001]
monitored.
RABORT
0 = receive B8ZS/HDB3 line format
1 = receive AMI line format
0 = normal framer operation
1 = framer disabled
0 = no effect
1 = force RX reframe
6
NOTE(S):
RLOFD–RLOFA equals all zeros.
T1/E1N
0
0
1
1
1
Other RLOFD–RLOFA combinations are invalid. RAIS and RLOF status is disabled if
RFORCE
5
RLOFD–A
0100
1100
0001
0010
0100
Table 2-1, Receive Framer
RLOFD
4
Conexant
3 consecutive FAS or 915 CRC errors
RLOFC
3
3 consecutive FAS errors
2 out of 4 F-bit errors
2 out of 5 F-bit errors
2 out of 6 F-bit errors
Reframe Criteria
Modes, to find which frame bits are
RLOFB
2
Quad/x16/Octal—T1/E1/J1 Framers
CX28394/28395/28398
RLOFA
1
RZCS
100054E
0