Device Overview
MFR4310 Reference Manual, Rev. 2
Freescale Semiconductor 41
2.4.3.11 RXD_BG[2:1] — PHY Data Receiver Inputs
RXD_BG[2:1] are bus driver receive data input signals if the FlexRay Optical/Electrical PHY is
configured:
• RXD_BG1 is the input to the CC from Physical Layer Channel 1
• RXD_BG2 is the input to the CC from Physical Layer Channel 2
These pins can be configured to enable or disable pullup or pulldown resistors on the pins.
2.4.3.12 TXEN[2:1]# — PHY Transmit Enable
TXEN[2:1]# are bus driver transmit enable output signals if the FlexRay Optical/Electrical PHY is
configured:
• TXEN1# is the output of the CC to Physical Layer Channel 1
• TXEN2# is the output of the CC to Physical Layer Channel 2
These pins can be configured to provide high or reduced output drive.
2.4.3.13 TXD_BG[1:2]/IF_SEL[1:0] — PHY Transmit Data Outputs, Host Interface
Selection
These pins can be configured to provide high or reduced output drive.
TXD_BG[1:2] are bus driver transmit data output signals if the FlexRay Optical/Electrical PHY is
configured:
• TXD_BG1 is the output of the CC to Physical Layer Channel 1
• TXD_BG2 is the output of the CC to Physical Layer Channel 2
IF_SEL[1:0] are the CC external interface selection input signals. Refer to Table 2-6 for the selection
coding.
NOTE
The IF_SEL[1:0] signals are inputs during the internal reset sequence and
are latched during the internal reset sequence.
While the IF_SEL[1:0] levels are being latched, the output drive control is
disabled and the internal pull resistors are connected (pullup on IF_SEL0;
pulldown on IF_SEL1).
As IF_SEL[1:0] signals share pins with Physical Layer Interface signals,
pullup/pulldown devices must be used for the selection. Recommended
pullup/pulldown resistor values for the IF_SEL[1:0] inputs are given in
Section 2.6.3, “Recommended Pullup/pulldown Resistor Values”.
2.4.3.14 CHICLK_CC — External CHI Clock Input
CHICLK_CC is the selectable external CHI clock input. It can be selected to drive the Asynchronous
Memory Interface (see Section 2.6.2, “External Host Interface Selection”).
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