DSP56300FMSLASHAD datasheet(11/120 Pages) NXP

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1-5

Phase Lock Loop (PLL)

1.5 Phase Lock Loop (PLL)

1.6 External Memory Expansion Port (Port A)

Note:

When the DSP56305 enters a low-power stand-by mode (Stop or Wait), it releases bus

mastership and tri-states the relevant Port A signals: A[0–23], D[0–23], AA0/RAS0–AA3/RAS3,

, WR, BB, CAS, BCLK, and BCLK. If hardware refresh of external DRAM is enabled, Port A

exits the Wait mode to allow the refresh to occur and then returns to the Wait mode.

1.6.1 External Address Bus

Table 1-5. Phase Lock Loop Signals

Signal

Name

Type

State

During

Reset

Signal Description

CLKOUT

Output

Chip-driven

Clock Output

Provides an output clock synchronized to the internal core clock

phase.

If the PLL is enabled and both the multiplication and division

factors equal one, then CLKOUT is also synchronized to EXTAL.

If the PLL is disabled, the CLKOUT frequency is half the

frequency of EXTAL.

PCAP

Input

PLL Capacitor

Connects an off-chip capacitor to the PLL filter. Connect one

capacitor terminal to PCAP and the other terminal to VCCP.

If the PLL is not used, PCAP can be tied to VCC, GND, or left

floating.

PINIT/NMI

Input

PLL Initial/Non-Maskable Interrupt

During assertion of RESET, the value of PINIT/NMI is written into

the PLL Enable (PEN) bit of the PLL control register, determining

whether the PLL is enabled or disabled. After RESET

deassertion and during normal instruction processing, the

PINIT/NMI Schmitt-trigger input is a negative-edge-triggered

Non-Maskable Interrupt (NMI) request internally synchronized to

CLKOUT.

PINIT/NMI can tolerate 5 V.

Table 1-6. External Address Bus Signals

Signal

Name

Type

State

During

Reset

Signal Description

A[0–23]

Output

Tri-stated

Address Bus

When the DSP is the bus master, A[0–23] specify the address

for external program and data memory accesses. Otherwise, the

signals are tri-stated. To minimize power dissipation, A[0–23] do

not change state when external memory spaces are not being

accessed.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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