cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 226

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

3.0 Registers
3.16 System Bus Registers
THRU
Unused bits are reserved and should be written to 0.
OFFSET[14:10]
3-104
0D8—Signaling Reinsertion Frame Offset (RSYNC_FRM)
—
7
Enable Transparent Robbed-Bit Signaling—RMSYNC is forced to align with respect to RX
timebase and to follow each change of receiver’s multiframe alignment, plus any frame offset
caused by RSLIP buffer delay. In this manner, RMSYNC is able to retain its signaling
multiframe alignment with respect to RPCMO output data frames. THRU mode is required
when RSLIP is configured in bypass mode. It is also useful for ADPCM transcoder systems
that utilize robbed-bit signaling during frames other than the normal (modulo 6) signaling
frames and therefore cannot utilize RPCMO signaling reinsertion in ADPCM coded channels.
During THRU mode, RMSYNC must be programmed as an output [PIO; addr 018].
RMSYNC can follow a change of RX multiframe alignment without generating an alarm
indication (e.g., receiver change of SF alignment without accompanying loss of basic frame
alignment).
RSB Sync Frame Offset—Selects which RSB frame number coincides with RMSYNC pulse
in the range of frame 0–23. OFFSET specifies the frame in which RMSYNC is applied as an
input or in which RMSYNC appears as an output, consequently locating RPCMO signaling
frames used for T1 robbed-bit (frames 6,12,18, and 24) or E1 CAS signaling reinsertion. The
only RPCMO channels affected are those with signaling insertion enabled [INSERT; addr
0E0–0FF].
—
0 = no effect
1 = transparent robbed-bit signaling
6
T1/E1N
0
0
0
0
1
1
1
1
|
|
—
5
OFFSET[14]
OFFSET[14:10]
4
Conexant
X0000
X0001
X1110
X1111
00000
00001
10110
10111
|
|
OFFSET[13]
3
RMSYNC Pulse
RSB frame 14
RSB frame 15
RSB frame 23
RSB frame 24
RSB frame 0
RSB frame 1
RSB frame 1
RSB frame 2
OFFSET[12]
2
|
|
Quad/x16/Octal—T1/E1/J1 Framers
CX28394/28395/28398
OFFSET[11]
1
OFFSET[10]
100054E
0