DS26518GN+ Maxim Integrated Products, DS26518GN+ Datasheet - Page 123

• Manufacturer Part Number: DS26518GN+
• Description: IC TXRX T1/E1/J1 8PORT 256-CSBGA
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of DS26518GN+

• 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

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 10-12. 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
123 of 286
BPREFSEL0
4
0
BFREQSEL
Table
3
0
DS26518 8-Port T1/E1/J1 Transceiver
10-13. See
FREQSEL
2
0
Figure 9-9
MPS1
1
0
Table
for additional
10-12.
MPS0
0
0