Rainbow Electronics DS21458 - Manual (Page 210)

DS21455/DS21458 Quad T1/E1/J1 Transceivers
210 of 270
33. USER-PROGRAMMABLE OUTPUT PINS
The DS21455/DS21458 provide four user-programmable output pins. The pins are automatically cleared
to zero at power-up or as a reset of a hardware- or software-issued reset.
Register Name:
CCR4
Register Description: Common Control Register 4
Register Address: 73h
Bit
# 7 6 5 4 3 2 1 0
Name RLT3 RLT2 RLT1 RLT0 UOP3 UOP2 UOP1 UOP0
Default
0 0 0 0 0 0 0 0
Bit 0/User-Defined Output 0 (UOP0).
0 = logic 0 level at pin
1 = logic 1 level at pin
Bit 1/User-Defined Output 1 (UOP1).
0 = logic 0 level at pin
1 = logic 1 level at pin
Bit 2/User-Defined Output 2 (UOP2).
0 = logic 0 level at pin
1 = logic 1 level at pin
Bit 3/User-Defined Output 3 (UOP3).
0 = logic 0 level at pin
1 = logic 1 level at pin
Bits 4 to 7/Receive Level Threshold Bits (RLT0 to RLT3).
RLT3 RLT2 RLT1 RLT0
Receive Level
(dB)
0 0 0 0 Greater than -2.5
0 0 0 1 -2.5
0 0 1 0 -5.0
0 0 1 1 -7.5
0 1 0 0 -10.0
0 1 0 1 -12.5
0 1 1 0 -15.0
0 1 1 1 -17.5
1 0 0 0 -20.0
1 0 0 1 -22.5
1 0 1 0 -25.0
1 0 1 1 -27.5
1 1 0 0 -30.0
1 1 0 1 -32.5
1 1 1 0 -35.0
1 1 1 1 Less than -37.5