ds26519 Maxim Integrated Products, Inc., ds26519 Datasheet - Page 36

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

generation. This register is also used to program REFCLKIO as an input or output. REFCLKIO can be an output
sourcing MCLKT1 or MCLKE1 as shown in
This backplane clock and frame pulse (TSSYNCIOn) can be used by the DS26519 and other IBO-equipped
devices as an “IBO Bus Master.” Hence, the DS26519 provides the 8kHz sync pulse and 4MHz, 8MHz, and 16MHz
clock. This can be used by the link layer devices and frames connected to the IBO bus.
Figure 9-9. Backplane Clock Generation
The reference clock for the backplane clock 1 generator can be as follows:
The reference clock for the backplane clock 2 generator can be as follows:
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External Master Clock. A prescaler can be used to generate T1 or E1 frequency.
External Reference Clock REFCLKIO. This allows for multiple DS26519s to use the backplane clock from
a common reference.
Internal LIU recovered RCLKs 1 to 8.
The clock generator can be used to generate BPCLK1 of 2.048MHz, 4.096MHz, 8.192MHz, or 16.384MHz
for the IBO.
If MCLK or RCLKn is used as a reference, REFCLKIO can be used to provide a 2.048MHz or 1.544MHz
clock for external use.
External Master Clock. A prescaler can be used to generate T1 or E1 frequency.
External Reference Clock REFCLKIO. This allows for multiple DS26519s to use the backplane clock from
a common reference.
Internal LIU recovered RCLKs 9 to 16.
The clock generator can be used to generate BPCLK2 of 2.048MHz, 4.096MHz, 8.192MHz, or 16.384MHz
for the IBO.
If MCLK or RCLKn is used as a reference, REFCLKIO can be used to provide a 2.048MHz or 1.544MHz
clock for external use.
MCLK
Scaler
PLL
Pre
REFCLKIO
MCLKT1
MCLKE1
RCLK1
RCLK2
RCLK3
RCLK4
RCLK5
RCLK6
RCLK7
RCLK8
Figure
BPREFSEL3:0
9-9.
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DS26519 16-Port T1/E1/J1 Transceiver
BFREQSEL
BPCLK1:0
GEN
CLK
TSSYNCIO
REFCLKIO
BPCLK