DS21448 Maxim Integrated Products, DS21448 Datasheet - Page 19

• Manufacturer Part Number: DS21448
• Description: IC LIU QUAD E1/T1/J1 144-BGA
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS21448

• Number Of Drivers/receivers: 4/4
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 144-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.3.3 Control Registers
CCR1 (00H): Common Control Register 1
LOTCMC
JAMUX
NAME
ECUE
TTOR
NRZE
RCLA
TTOJ
ETS
(MSB)
ETS
POSITION
CCR1.7
CCR1.6
CCR1.5
CCR1.4
CCR1.3
CCR1.2
CCR1.1
CCR1.0
NRZE
E1/T1 Select
0 = E1
1 = T1
NRZ Enable
0 = bipolar data at RPOS/RNEG and TPOS/TNEG
1 = NRZ data at RPOS and TPOS or TNEG; RNEG outputs a positive-going pulse when the
device receives a BPV, CV, or EXZ
Receive-Carrier-Loss Alternate Criteria
0 = RCL declared upon 255 (E1) or 192 (T1) consecutive zeros
1 = RCL declared upon 2048 (E1) or 1544 (T1) consecutive zeros
Error Counter Update Enable. A 0-to-1 transition forces the next receive clock cycle to load the
error counter registers with the latest counts and reset the counters. The user must wait a
minimum of two clock cycles (976ns for E1 and 1296ns for T1) before reading the error count
registers to allow for a proper update. See Section
Jitter Attenuator Clock Mux. Controls the source for JACLK
0 = JACLK sourced from MCLK (2.048MHz or 1.544MHz at MCLK)
1 = JACLK sourced from internal PLL (2.048MHz at MCLK)
TCLK to JACLK. Internally connects TCLK to JACLK
0 = disabled
1 = enabled
TCLK to RCLK. Internally connects TCLK to RCLK
0 = disabled
1 = enabled
Loss-of-Transmit Clock Mux Control. Determines whether the transmit logic should switch to
JACLK if the TCLK input should fail to transition
0 = do not switch to JACLK if TCLK stops
1 = switch to JACLK if TCLK stops
RCLA
ECUE
19 of 60
JAMUX
FUNCTION
(Figure
6
(Figure
for details.
(Figure
1-3).
TTOJ
1-3).
(Figure
1-3).
1-1).
TTOR
LOTCMC
(LSB)