Datasheet

DS26514 4-Port T1/E1/J1 Transceiver
19-5856; Rev 4; 5/11 132 of 305
Table 10-16. Backplane Reference Clock Select
BPREFSEL3 BPREFSEL2 BPREFSEL1 BPREFSEL0 BFREQSEL
REFERENCE CLOCK
SOURCE
0
0
0
0
0
2.048MHz RCLK1
0
0
0
0
1
1.544MHz RCLK1
0
0
0
1
0
2.048MHz RCLK2
0
0
0
1
1
1.544MHz RCLK2
0
0
1
0
0
2.048MHz RCLK3
0
0
1
0
1
1.544MHz RCLK3
0
0
1
1
0
2.048MHz RCLK4
0
0
1
1
1
1.544MHz RCLK4
1 0 0 0 0
2.048MHz derived from
MCLK. (REFCLKIO is an
output.)
1 0 0 0 1
1.544MHz derived from
MCLK. (REFCLKIO is an
output.)
1 0 0 1 0
2.048MHz external clock
input at REFCLKIO.
(REFCLKIO is an input.)
1 0 0 1 1
1.544MHz external clock
input at REFCLKIO.
(REFCLKIO is an input.)