pnx1500 NXP Semiconductors, pnx1500 Datasheet - Page 204

• Manufacturer Part Number: pnx1500
• Description: Pnx15xx Series Connected Media Processor
• Manufacturer: NXP Semiconductors

1. Introduction
2. Functional Description
Before a PNX15xx Series system can begin operating, there are a couple of system
related MMIO registers,
PNX15xx Series interfaces like the main memory interface (MMI) or the PCI that
require to be configured. Since the TM3260 cannot begin operating before these
registers and circuits are initialized, the TM3260 cannot be relied on to initialize these
resources. Consequently, PNX15xx Series needs an independent bootstrap facility
for low-level initialization: the Boot module.
The boot module provides boot scripts to reduce the board system cost. The scripts
allow support for both host-assisted mode, and standalone boot mode. The
supported four boot modes are:
The different modes are determined by the GPIO[11:8,3:0]/BOOT_MODE[7:0] pins.
system reset event occurs, see
The PNX15xx Series boot sequence begins with the assertion of the system reset.
The system reset is seen by the boot module through the internal signal peri_rst_n.
After this internal reset is de-asserted only the system boot block and the PCI
interfaces are allowed to operate. In particular, the TM3260 remains in the reset state
until it is explicitly released from reset during or after the boot procedure. In the
standalone boot mode the system boot module is responsible for releasing the
TM3260 from the reset state. In host-assisted boot the boot logic releases the
PNX15xx Series system from reset such that the PNX15xx Series software driver
(which runs on the host processor) can finish the configuration of the PNX15xx
Series system, download the TM3260 binary code and then release the TM3260 from
its reset state.
Once the boot procedure is complete, the boot module goes to sleep until another
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Chapter 6: Boot Module
PNX15xx Series Data Book – Volume 1 of 1
Rev. 3 — 17 March 2006
Boot from an external EEPROM attached on the I
contains a list of MMIO registers and memory locations to be written.
Boot for host-assisted systems. The host CPU kicks off TM3260. Therefore the
host is in charge of downloading the TM3260 binary program and in charge of
setting properly the remaining of the system.
Boot from NAND or NOR Flash memory devices. The first 8 Kilobytes of the
Flash memory contains the bootstrapping program for TM3260. The Flash
memory can be 8- or 16-bit wide.
Chapter 3 System On Chip
Chapter 4
Reset.
Resources, but also the main
2
C bus interface. The EEPROM
Product data sheet