Texas-instruments TMS320C6454 Uživatelský manuál stáhnout pdf (Strana 56)

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PRODUCT PREVIEW

3.4.1 Peripheral Lock Register Description

TMS320C6454

Fixed-Point Digital Signal Processor

SPRS311A – APRIL 2006 – REVISED DECEMBER 2006

When written with correct 32-bit key (0x0F0A0B00), the Peripheral Lock Register (PERLOCK) allows one

write to the PERCFG0 register within 16 SYSCLK3 cycles.

NOTE

The instructions that write to the PERLOCK and PERCFG0 registers must be in the same

fetch packet if code is being executed from external memory. If the instructions are in

different fetch packets, fetching the second instruction from external memory may stall the

instruction long enough such that PERCFG0 register will be locked before the instruction

is executed.

31 0

LOCKVAL

R/W-F0F0 F0F0

LEGEND: R/W = Read/Write; - n = value after reset

Figure 3-3. Peripheral Lock Register (PERLOCK) - 0x02AC 0004

Table 3-6. Peripheral Lock Register (PERLOCK) Field Descriptions

Bit Field Value Description

31:0 LOCKVAL When programmed with 0x0F0A 0B00 allows one write to the PERCFG0 register within 16

SYSCLK3 clock cycles.

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Texas-instruments TMS320C6454 Uživatelský manuál Strana 56