PNX1700EH,557 NXP Semiconductors, PNX1700EH,557 Datasheet - Page 206

• Manufacturer Part Number: PNX1700EH,557
• Manufacturer: NXP Semiconductors

Specifications of PNX1700EH,557

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

1. Introduction
2. Functional Description
Before a PNX17xx Series system can begin operating, there are a couple of system
related MMIO registers,
PNX17xx Series interfaces like the main memory interface (MMI) or the PCI that
require to be configured. Since the TM5250 cannot begin operating before these
registers and circuits are initialized, the TM5250 cannot be relied on to initialize these
resources. Consequently, PNX17xx 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 PNX17xx 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 TM5250 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
TM5250 from the reset state. In host-assisted boot the boot logic releases the
PNX17xx Series system from reset such that the PNX17xx Series software driver
(which runs on the host processor) can finish the configuration of the PNX17xx
Series system, download the TM5250 binary code and then release the TM5250 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
PNX17xx Series Data Book – Volume 1 of 1
Rev. 1 — 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 TM5250. Therefore the
host is in charge of downloading the TM5250 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 TM5250. 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
Preliminary data sheet