DS26518GNB1+ Maxim Integrated Products, DS26518GNB1+ Datasheet - Page 132
DS26518GNB1+
Manufacturer Part Number
DS26518GNB1+
Description
IC TXRX T1/E1/J1 8PRT 256-CSBGA
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet
1.DS26518GNB1.pdf
(312 pages)
Specifications of DS26518GNB1+
Number Of Drivers/receivers
8/8
Protocol
T1/E1/J1
Voltage - Supply
3.135 V ~ 3.465 V
Mounting Type
Surface Mount
Package / Case
256-CSBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 7 to 4: Backplane Clock Reference Selects (BPREFSEL[3:0]). These bits select which reference clock
source will be used for BPCLK1 generation. The BPCLK1 can be generated from LIU’s 1 to 8 recovered clocks, an
external reference, or derivatives of MCLK input. This is shown in
information.
Bit 3: Backplane Frequency Select (BFREQSEL). In conjunction with BPRFSEL[3:0], this bit identifies the
reference clock frequency used by the DS26518 backplane clock generation circuit. Note that the setting of this bit
should match the T1E1 selection for the LIU whose recovered clock is being used to generate the backplane clock.
See
Bit 2: Frequency Selection (FREQSEL). In conjunction with the MPS[1:0] bits, this bit selects the external MCLK
frequency of the signal input at the MCLK pin of the DS26518.
Bits 1 and 0: Master Period Select 1 and 0 (MPS[1:0]). In conjunction with the FREQSEL bit, these bits select
the external MCLK frequency of the signal input at the MCLK pin of the DS26518. This is shown in
Table 10-14. Master Clock Input Selection
FREQSEL
Figure 9-9
0
0
0
0
1
1
1
1
0 = Backplane reference clock is 2.048MHz.
1 = Backplane reference clock is 1.544MHz.
0 = The external master clock is 2.048MHz or multiple thereof.
1 = The external master clock is 1.544MHz or multiple thereof.
BPREFSEL3
MPS1
for additional information.
0
0
1
1
0
0
1
1
7
0
MPS0
0
1
0
1
0
1
0
1
GTCCR1
Global Transceiver Clock Control Register 1
00F3h
BPREFSEL2
6
0
(MHz ±50ppm)
16.384
12.352
MCLK
2.048
4.096
8.192
1.544
3.088
6.176
BPREFSEL1
5
0
132 of 312
BPREFSEL0
4
0
BFREQSEL
Table
3
0
10-15. See
FREQSEL
2
0
Figure 9-9
MPS1
1
0
Table
for additional
10-14.
MPS0
0
0
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