cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 134

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

3.0 Registers
3.3 Primary Control and Status Register
RFRAME[3:0]
T1/E1N
3-12
Receiver Framer Mode—Establishes the offline framer's search criteria for recovery of frame
alignment (reframe). Also works in conjunction with the RLOFA–RLOFD bits [addr 040] to
establish the online framer's criteria for loss of frame alignment. Refer to
A-6
Receive Framer
mode. Mode descriptions are given in
criteria for loss/recovery of multiframe alignment are also selected by RFRAME[3:0].
Table 3-5. Receive Framer Modes
Global T1/E1 Select—Affects all functions by enabling receive and transmit circuits to operate
at either the T1 or E1 line rate. The processor should reinitialize all control register settings
after changing the T1/E1N control bit. T1/E1N selects the nominal line rate (shown below)
while the exact receive and transmit line rate frequencies are independently determined by
their respective input clock or input data references. The actual receive and transmit line
frequency can vary within defined tolerances.
RFRAME[3:0]
0 = 2.048 MHz line rate (E1)
1 = 1.544 MHz line rate (T1)
to find which frame bits are monitored and
000X
001X
010X
011X
100X
101X
110X
111X
0000
0001
0100
0101
0110
1000
1001
1100
1101
Alignment, for frame alignment loss/recovery criteria during the selected
T1/E1N
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
Conexant
FAS Only
FAS Only + BSLIP
FAS + CRC
FAS + CRC + BSLIP
FAS + CAS
FAS + CAS + BSLIP
FAS + CRC + CAS
FAS + CRC + CAS + BSLIP
F T Only
ESF + No CRC (FPS only)
SF
SF + JYEL
SF + T1DM
SLC + FSLOF
SLC
ESF + Mimic CRC
ESF + Force CRC
Table
3-5. Online framer’s SF, SLC, CAS and MFAS
Receive Framer Mode
Table 2-2, Criteria for Loss/Recovery of
Quad/x16/Octal—T1/E1/J1 Framers
CX28394/28395/28398
Tables A-1
through
100054E