DS26521L+ Maxim Integrated Products, DS26521L+ Datasheet - Page 59

• Manufacturer Part Number: DS26521L+
• Description: IC TXRX T1/E1/J1 64-LQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26521L+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 44.736 Mbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 220 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.9.15 T1 Programmable In-Band Loop Code Generator
The DS26521 can generate and detect a repeating bit pattern from one to eight bits or 16 bits in length. This
function is available only in T1 mode.
Table 8-25. Registers Related to T1 In-Band Loop Code Generator
Transmit Code Definition Register 1
(T1TCD1)
Transmit Code Definition Register 2
(T1TCD2)
Transmit Control Register 3 (TCR3)
Transmit Control Register 4 (TCR4)
To transmit a pattern, the user loads the pattern to be sent into the Transmit Code Definition registers
and T1TCD2) and selects the proper length of the pattern by setting the TC1 and TC0 bits in Transmit Control
Register 4 (TCR4). When generating a 1-, 2-, 4-, 8-, or 16-bit pattern, both
with the proper code. Generation of a 3-, 5-, 6-, and 7-bit pattern only requires
accomplished, the pattern is transmitted as long as the TLOOP control bit (TCR3.0) is enabled. Normally (unless
the transmit formatter is programmed to not insert the F-bit position) the framer overwrites the repeating pattern
once every 193 bits to allow the F-bit position to be sent.
As an example, to transmit the standard loop-up code for Channel Service Units (CSUs), which is a repeating
pattern of ...10000100001..., set TCD1 = 80h, TC0 = 0, TC1 = 0, and TCR3.0 = 1.
REGISTER
ADDRESSES
FRAMER
1ACh
1ADh
183h
186h
59 of 258
Pattern to be sent for loop code.
Length of the pattern to be sent.
TLOOP bit for control of number of patterns being
sent.
Length of the code being sent.
DS26521 Single T1/E1/J1 Transceiver
T1TCD1
T1TCD1
FUNCTION
and
to be filled. Once this is
T1TCD2
must be filled
(T1TCD1