3.0 Registers
CX28394/28395/28398
3.3 Primary Control and Status Register
Quad/x16/Octal—T1/E1/J1 Framers
RFRAME[3:0]
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 Tables A-1 through
A-6 to find which frame bits are monitored and Table 2-2, Criteria for Loss/Recovery of
Receive Framer Alignment, for frame alignment loss/recovery criteria during the selected
mode. Mode descriptions are given in Table 3-5. Online framer’s SF, SLC, CAS and MFAS
criteria for loss/recovery of multiframe alignment are also selected by RFRAME[3:0].
Table 3-5. Receive Framer Modes
RFRAME[3:0]
T1/E1N
Receive Framer Mode
000X
001X
010X
011X
100X
101X
110X
111X
0000
0001
0100
0101
0110
1000
1001
1100
1101
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
FAS Only
FAS Only + BSLIP
FAS + CRC
FAS + CRC + BSLIP
FAS + CAS
FAS + CAS + BSLIP
FAS + CRC + CAS
FAS + CRC + CAS + BSLIP
FT Only
ESF + No CRC (FPS only)
SF
SF + JYEL
SF + T1DM
SLC + FSLOF
SLC
ESF + Mimic CRC
ESF + Force CRC
T1/E1N
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.
0 = 2.048 MHz line rate (E1)
1 = 1.544 MHz line rate (T1)
3-12
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
