I/o pin configuration options, Iocr1 – Rainbow Electronics DS26502 User Manual
Page 52
DS26502 T1/E1/J1/64KCC BITS Element
52 of 125
10. I/O PIN CONFIGURATION OPTIONS
Register Name:
IOCR1
Register Description:
I/O Configuration Register 1
Register Address:
01h
Bit
# 7 6 5 4 3 2
1
0
Name —
RSMS2
RSMS1
RLOFF
CSM_TSDW
TSM TSIO ODF
Default 0
0
0
0
0 0 0 0
HW
Mode
0 0
RSM
PIN 1
0 0
TSM
PIN 2
0 0
Bit 0/Output Data Format (ODF).
0 = bipolar data at TPOS and TNEG
1 = NRZ data at TPOS; TNEG = 0
Bit 1/TS_8K_4 I/O Select (TSIO). This bit determines whether the TS_8K_4 pin is an input or and output. See
0 = TS_8K_4 is an input
1 = TS_8K_4 is an output
Bit 2/TS_8K_4 Mode Select (TSM). In T1 or E1 operation, selects frame or multiframe mode for the TS_8K_4 pin. In
6312kHz or 64KCC mode, this bit should be set = 0. See
0 = frame mode
1 = multiframe mode
Bit 3/Composite Clock Sync Mode_ Transmit Signaling Double-Wide Sync (CSM_TSDW). In 64 kHz Composite Clock
mode, this bit determines whether the TS_8K_4 pin is an 8kHz or a 400Hz reference input (TS_8K_4 pin in input mode,
IOCR1 = 0), or an 8kHz or 400Hz reference output (TS_8K_4 pin in output mode, IOCR1 = 1). In T1 mode, setting this bit =
1 and setting TSIO = 1 will cause the sync pulse output on TS_8K_4 to be two clocks wide during signaling frames. In E1 or
6312kHz mode this bit should be set = 0. See
0 = (CC64K) 8kHz reference, (T1) normal sync pulses
1 = (CC64K) 400Hz reference, (T1) double-wide sync pulses during signaling frames
Bit 4/ RLOF_CCE Output Function (RLOFF). In T1 or E1 receive mode this bit determines the function of the
RLOF_CCE pin. In 64KCC or 6312kHz receive mode, this bit should be set = 0.
0 = receive loss of frame (RLOF)
1 = loss-of-transmit clock (LOTC)
Bit 5/RS_8K Mode Select 1(RSMS1). In T1 or E1 receive mode, this bit selects a frame or multiframe output pulse at
RS_8K pin. IOCR.6 may be used to select other function for the RS_8K pin.
0 = frame mode
1 = multiframe mode
Bit 6/RS_8K Mode Select 2 (RSMS2). In T1 and E1 receive mode, this bit along with IOCR.5 selects the function of the
RS_8K pin.
T1 Mode: (when IOCR.5 set = 0)
0 = do not pulse double-wide in signaling frames
1 = do pulse double-wide in signaling frames
E1 Mode: (when IOCR.5 set = 1)
0 = RS_8K outputs CAS multiframe boundaries
1 = RS_8K outputs CRC4 multiframe boundaries
Bit 7/Unused, must be set = 0 for proper operation
.