ds26519 Maxim Integrated Products, Inc., ds26519 Datasheet - Page 136

• Manufacturer Part Number: ds26519
• Description: Ds26519 16-port T1/e1/j1 Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

Register Name:
Register Description:
Register Address:
Channels:
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 BPCLKn pin can be generated from the LIU’s 1 to 8 recovered
clocks, an external reference, or derivatives of MCLK input. This is shown in
additional information.
Bit 3: Backplane Frequency Select (BFREQSEL). In conjunction with BPRFSEL[3:0], this bit identifies the
reference clock frequency used by the DS26519 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 DS26519.
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 DS26519. 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
1 to 8
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
136 of 310
BPREFSEL0
4
0
BFREQSEL
0
3
DS26519 16-Port T1/E1/J1 Transceiver
Table
FREQSEL
2
0
10-15. See
MPS1
1
0
Table
Figure 9-9
10-14.
MPS0
0
0
for