mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 47

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

2.6.3
As the IF_SEL[1:0] signals share pins with Physical Layer Interface signals, pullup and pulldown resistors
should be used for the selection. The recommended pullup/pulldown resistor values for the IF_SEL[1:0]
inputs are given in
2.7
The MFR4300 can be connected through two types of bus interface (see
Interface
interface are described below.
2.7.1
Figure 2-5
Freescale Semiconductor
•
•
•
•
1
IO, Regulator and analog supply level
The listed values are calculated for the MFR4300-Physical Layer connection where no internal pullup/pulldown
resistors are assumed in the Electrical PHY at the TXD_BG1 and TXD_BG2 interface lines. If an Electrical PHY
device has internal pullup/pulldown resistors connected to these signals, then the external pullup/pulldown resistor
values must be recalculated to ensure that V
resistors for the chosen V
Data exchange in AMI Mode is controlled by the CE#, WE# and OE# signals.
The FlexRay AMI interface is implemented as an asynchronous memory slave module, thus
enabling fast interfacing between the CC and a variety of microcontrollers.
The FlexRay CC MCU interface decodes its internal register addresses with the help of the chip
select signal CE# and the address lines A[12:1].
The AMI interface accepts only aligned 16-bit read and 8-bit or 16-bit write transactions. The AMI
interface does not support 8-bit read accesses.
— The byte selects BSEL[1:0]#, the chip enable CE#, the output enable OE#, and the write enable
Selection” for information on how to select the host interface). The two types of microprocessor
External Host Interface
Table 2-7. Recommended Pullup and Pulldown Resistor Values for IF_SEL[1:0] Inputs
shows how to connect the FlexRay CC to a microcontroller using the AMI interface.
Recommended Pullup/pulldown Resistor Values
Asynchronous Memory Interface
WE# are used to determine the type of access as shown in
2.Assert the external hard reset signal of the CC again.
(V
Table
3.3V
5V
DD5
)
2-7:
DD5
are met. See
MFR4300 Data Sheet, Rev. 3
Section A.1.9, “I/O
Pullup resistor
IL
requirements for pulldown resistors or V
16
10
1
Characteristics” for more details on V
Pulldown resistor
47
47
Table
Section 2.6.2, “External Host
2-8.
1
IH
requirements for pullup
IL
Units
, V
k
k
:
:
IH
Device Overview
and V
DD5
.
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