mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 249

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

1
A.3.2
The device features an internal Pierce oscillator with a clock monitor. A clock monitor failure is asserted
if the clock signal is below the Clock Monitor Assert Frequency, f
A.4
The CC AMI Interface read/write timing diagram is shown in the following figures.
Freescale Semiconductor
Conditions are shown in
Num C
10
11
Depending on the crystal a damping series resistor might be necessary
1
2
4
5
6
7
8
9
•
•
•
C Crystal oscillator range (Pierce)
P Startup Current
P Clock monitor assert frequency
P External square wave input frequency
D External square wave pulse width low
D External square wave pulse width high
D External square wave rise time
D External square wave fall time
D Input Capacitance (EXTAL, XTAL pins)
C DC Operating Bias in Pierce mode on EXTAL Pin
Writing to the device is accomplished when Chip Enable (CE#) and Write Enable (WE#) inputs
are LOW (asserted).
Reading from the device is accomplished when Chip Enable (CE#) and Output Enable (OE#) are
LOW (asserted) while the Write Enable (WE#) is HIGH (deasserted).
The input/output pins D[15:0] are in a high-impedance state when the device is not selected (CE#
is HIGH), the outputs are disabled (OE# HIGH) or during a write operation (CE# LOW, and WE#
LOW).
Asynchronous Memory Interface Timing
Oscillator
Table A-4
Rating
unless otherwise noted
Table A-12. Oscillator Characteristics
1
MFR4300 Data Sheet, Rev. 3
Symbol
V
f
t
t
t
t
DCBIAS
f
CMAF
i
EXTH
EXTR
f
EXTL
EXTF
OSC
OSC
C
EXT
IN
CMFA
Min
100
0.5
0.5
9.5
9.5
50
—
—
—
—
.
TBD
Typ
100
—
—
—
—
—
—
—
7
Electrical Characteristics
Max
200
40
50
—
—
—
—
—
1
1
MHz
MHz
Unit
kHz
PA
pF
ns
ns
ns
ns
V
249