MSC8144E Reference Manual, Rev. 3
5-8
Freescale
Semiconductor
Reset
Note:
The value of the reset configuration signals affects the duration of power-on and hard
reset sequences, but the duration of the reset sequence will not exceed 4 ms.
Table 5-3 for input signal details.
5.2.3 CLKIN Frequency Range Signal
The
CLKIN
frequency range reset configuration input (
CFG_CLKIN_RNG
) indicates whether the
CLKIN
is less than or more than 66 MHz. See Table 5-3 for input signal details.
5.2.4 Reset Configuration Load Fail Signal
The reset configuration load fail (
RC_LDF
) output is valid only when the reset configuration words
are loaded from an I
2
C EEPROM using the boot sequencer and indicates that the boot sequencer
failed due to an error. The failure can be caused by an incorrect EEPROM data structure or an I
2
C
bus problem (see Chapter 24, I
C for details. This output signal is valid while
HRESET
is
asserted. It may be asserted any time between deassertion of
PORESET
and deassertion of
HRESET
. If a failure occurs, the MSC8144E does not deassert
HRESET
and stays in the reset state.
The MSC8144E resumes reading the RCW; the flow may repeat itself until no error id is
detected. This signal can help debug reset issues.
5.2.5 Selecting Reset Configuration Input Signals
Table 5-3 shows how to pull down (0) or pull up (1) the reset configuration input signals for
various configurations. The reset sequence duration is measured from the deassertion of
PORESET
to the deassertion of
SRESET
.
Note:
When loading the RCW from I
2
C, RCWHR[ER] must be set (1).
Table 5-3. Selecting Reset Configuration Input Signals
Configuration
Words on I
2
C
EEPROM
CLKIN
Frequency
CFG_CLKIN_RNG, RCW_SRC[0–2]
Reset Sequence
Duration in CLKIN
Cycles
Duration in µs
No
33 MHz
0, 011–111 (not I
2
C EEPROM)
15385
466
No
67 MHz
1, 011–111 (not I
2
C EEPROM)
34841
520
Yes
33 MHz
0, 001 (I
2
C EEPROM, low clock in frequency)
92561
2805
Yes
66 MHz
0, 010 (I
2
C EEPROM, mid clock in frequency)
107451
1628
Yes
67 MHz
1, 001 (I
2
C EEPROM, high clock in frequency)
124224
1854
Yes
133 MHz
1, 010 (I
2
C EEPROM, high clock in frequency)
157896
1187
Notes: 1.
Do not extend the external assertion of the
HRESET
or
SRESET
signals to the input pins for more than 0.36 ms
after the deassertion of the MSC8144
PORESET
signal. If the timing of the
PORESET
circuits is not accurate
enough to guarantee this limitation, do not extend the assertion of
HRESET
and
SRESET
beyond the deassertion
of
PORESET
.
2.
When loading the RCW from I
2
C, the duration values assume STOP_BS is held low during the
PORESET
sequence and that SDA is not stuck.
Summary of Contents for MSC8144E
Page 1: ...MSC8144E Reference Manual Quad Core Media Signal Processor MSC8144ERM Rev 3 July 2009 ...
Page 48: ...MSC8144E Reference Manual Rev 3 xlviii Freescale Semiconductor ...
Page 86: ...MSC8144E Reference Manual Rev 3 1 38 Freescale Semiconductor Overview ...
Page 168: ...MSC8144E Reference Manual Rev 3 3 60 Freescale Semiconductor External Signals ...
Page 242: ...MSC8144E Reference Manual Rev 3 5 26 Freescale Semiconductor Reset ...
Page 314: ...MSC8144E Reference Manual Rev 3 8 24 Freescale Semiconductor General Configuration Registers ...
Page 414: ...MSC8144E Reference Manual Rev 3 10 14 Freescale Semiconductor MSC8144E SC3400 DSP Subsystem ...
Page 452: ...MSC8144E Reference Manual Rev 3 11 38 Freescale Semiconductor Internal Memory Subsystem ...
Page 520: ...MSC8144E Reference Manual Rev 3 12 68 Freescale Semiconductor DDR SDRAM Memory Controller ...
Page 1070: ...MSC8144E Reference Manual Rev 3 21 28 Freescale Semiconductor Timers ...