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Electrical Characteristics

MSC8144E Quad Core Digital Signal Processor Data Sheet, Rev. 6

Freescale Semiconductor

Table 23 summarizes the reset actions that occur as a result of the different reset sources.

2.7.3.1

Power-On Reset (PORESET) Pin

Asserting PORESET initiates the power-on reset flow. PORESET must be asserted externally for at least 32 CLKIN cycles after

VDD and VDDIO are both at their nominal levels.

2.7.3.2

Reset Configuration

The MSC8144E has two mechanisms for writing the reset configuration:

•

Through the I2C port

•

Through external pins

•

Through internal hard coded

Twenty-three signals (see Section 1 for signal description details) are sampled during the power-on reset sequence to define the

Reset Word Configuration Source and operating conditions:

•

RCW_SRC[2–0]

•

RC[16–0]

The RCFG_CLKIN_RNG pin must be valid during power-on or hard reset sequence. The STOP_BS pin must be always valid

and is also sampled during power-on reset sequence for RCW loading from an I

2C EEPROM.

Table 23. Reset Actions for Each Reset Source

Reset Action/Reset Source

Power-On Reset

(PORESET)

Hard Reset (HRESET)

Soft Reset (SRESET)

External only

External or Internal

(Software Watchdog,

Software or RapidIO)

External or

internal

Software

JTAG Command:

EXTEST, CLAMP, or

HIGHZ

Configuration pins sampled (Refer to

Section 2.7.3.2 for details).

Yes

NoNoNo

PLL state reset

Yes

Select reset configuration source

Yes

System reset configuration write

Yes

HRESET driven

Yes

IPBus modules reset (TDM, UART, SWT,

DDRC, IPBus master, GIC, HS, and GPIO)

Yes

SRESET driven

Yes

Depends on command

Extended cores reset

Yes

CLASS registers reset

Yes

Some

registers

Some registers

Timers, Performance Monitor

Yes

Packet Processor, PCI, DMA

Yes

Most

registers

Most registers

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