Freescale Semiconductor FlexRay MFR4310, Reference Manual

Page: 40 / 268

Device Overview
MFR4310 Reference Manual, Rev. 2
40 Freescale Semiconductor
D[15:8] are data signals of the AMI/MPC interface. D15 is the MSB of the AMI/MPC data bus.
PB[0:7] are HCS12 interface multiplexed address/data signals in the HCS12 Host interface mode of
operation. PB0 is the LSB of the HCS12 address/data bus.
2.4.3.7 D[7:0]/PA[0:7] — AMI/MPC Data Bus, HCS12 Multiplexed Address/Data
Bus
D[7:0]/PA[0:7] are general purpose input or output pins. Their functions are selected by the IF_SEL[1:0]
pins. Refer to
Section 2.7, “External Host Interface ” for more information. These pins can be configured
to provide high or reduced output drive, and also to enable or disable pullup or pulldown resistors on the
pins.
D[7:0] are data signals of the AMI/MPC interface. D0 is the LSB of the AMI/MPC data bus.
PA[0:7] are HCS12 interface multiplexed address/data signals in the HCS12 Host interface mode of
operation. PA7 is the MSB of the HCS12 address/data bus.
2.4.3.8 CE#/LSTRB — AMI/MPC Chip Select, HCS12 Low-byte Strobe
The function of this pin is selected by IF_SEL[1:0] pins. Refer Section 2.7, “External Host Interface ” for
more information. The pin can be configured to enable or disable a pullup or pulldown resistor on the pin.
CE# is an AMI/MPC interface transfer size input signal. It indicates the size of the requested data transfer
in the current bus cycle.
LSTRB is an HCS12 interface low-byte strobe input signal. It indicates the type of bus access.
2.4.3.9 WE#/RW_CC# — AMI Write Enable, HCS12 Read/Write Select
The function of this pin is selected by the IF_SEL[1:0] pins. Refer to Section 2.7, “External Host
Interface ” for more information. The pin can be configured to enable or disable a pullup or pulldown
resistor on the pin.
WE# is an AMI interface write select signal. It strobes the valid data provided by the host on the D[15:0]
pins during write operations to the MFR4310 memory.
RW_CC# is an HCS12 interface read/write input signal. It indicates the direction of data transfer for a
transaction.
2.4.3.10 A10/ECLK_CC — AMI/MPC Address Bus, HCS12 Clock Input
The function of this pin is selected by the IF_SEL[1:0] pins. Refer Section 2.7, “External Host Interface ”
for more information. The pin can be configured to enable or disable a pullup or pulldown resistor on the
pin.
A10 is an AMI/MPC interface address signal.
ECLK_CC is the HCS12 interface clock input signal. (The maximum frequency of this signal can be
calculated from the ECLK_CC pulse width low and high times, t
LEC
and t
HEC
given in Table A-15 .)