BCM89071A1CUBXGT Datasheet, PDF (38/69 Pages) Cypress Semiconductor – Single-Chip Automotive Grade Bluetooth Transceiver and Baseband Processor

BCM89071 Data Sheet
External Frequency Reference
TCXO OR Option
The BCM89071 has an optional feature that allows the application to perform a logical OR function on a system
TCXO clock request signal and the BCM89071 clock request to form one clock request output to the TCXO
device. This logical OR function is embedded in the pad ring so that it is available at any time, as long as the
pad ring is receiving a VDDO supply. The function works even if the BCM89071’s digital core is sleeping or
completely powered off.
Table 4 shows the truth table.
GPIO_6
CLK_REQ_IN
0
0
1
1
Table 4: Truth Table
Internal Clock Request State
(0 = sleep)
0
1
0
1
GPIO_5
CLK_REQ
0
1
1
1
Broadcom^®
April 16, 2015 • 89071-DS106-R
Baseband Transceiver and Baseband Processor
Page 37