DS26528DK Maxim Integrated Products, DS26528DK Datasheet - Page 148
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DS26528DK
Manufacturer Part Number
DS26528DK
Description
KIT DESIGN FOR DS26528
Manufacturer
Maxim Integrated Products
Datasheet
1.DS26528G.pdf
(276 pages)
Specifications of DS26528DK
Main Purpose
Telecom, Framer and Line Interface Units (LIUs)
Utilized Ic / Part
G575DS26528
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 7: Input Data Format (IDF).
Bit 5: RSER Control (RSERC).
Bit 1: Payload Loopback (PLB).
When PLB is enabled, the following will occur:
In a PLB situation, the DS26528 loops the 192 bits (248 for E1) of payload data (with BPVs corrected) from the
receive section back to the transmit section. The transmitter follows the frame alignment provided by the receiver.
The receive frame boundary is automatically fed into the transmit section, such that the transmit frame position is
locked to the receiver (i.e., TSYNC is sourced from RSYNC). The FPS framing pattern, CRC-6 calculation, and the
FDL bits (FAS word, Si, Sa, E-bits, and CRC-4 for E1) are not looped back. Rather, they are reinserted by the
DS26528 (i.e., the transmit section will modify the payload as if it was input at TSER).
Bit 0: Framer Loopback (FLB).
This loopback is useful in testing and debugging applications. In FLB, the DS26528 loops data from the transmit
side back to the receive side. When FLB is enabled, the following will occur:
1) Data will be transmitted from the TTIP and TRING pins synchronous with RCLK instead of TCLK.
2) All the receive-side signals will continue to operate normally.
3) The TCHCLK and TCHBLK signals are forced low.
4) Data at the TSER, TDATA, and TSIG pins is ignored.
5) The TLCLK signal will become synchronous with RCLK instead of TCLK.
1) (T1 mode) An unframed all-ones code will be transmitted at TTIP and TRING.
2) Data at RTIP and RRING will be ignored.
3) All receive-side signals will take on timing synchronous with TCLK instead of RCLK.
4) Note that it is not acceptable to have RCLK tied to TCLK during this loopback because this will cause an
0 = bipolar data is expected at RTIP and RRING (either AMI or B8ZS)
1 = NRZ data is expected at RTIP. The BPV counter will be disabled and RRING will be ignored by the
DS26528.
0 = allow RSER to output data as received under all conditions (normal operation)
1 = force RSER to one under loss of frame alignment conditions
0 = loopback disabled
1 = loopback enabled
0 = loopback disabled
1 = loopback enabled
(E1 mode) Normal data will be transmitted at TTIP and TRING.
unstable condition.
IDF
7
0
RCR3
Receive Control Register 3
083h + (200h x n): where n = 0 to 7, for Ports 1 to 8
—
6
0
RSERC
5
0
148 of 276
—
4
0
—
3
0
DS26528 Octal T1/E1/J1 Transceiver
—
2
0
PLB
1
0
FLB
0
0
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