pnx1700 NXP Semiconductors, pnx1700 Datasheet - Page 209

• Manufacturer Part Number: pnx1700
• Description: Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
Figure 1:
Boot Block Diagram
2.2.1 MMIO Bus Interface
2.2.2 I
2.2 Boot Module Operation
DCS Bus
The following presents a high level block diagram of the boot module.
The four main components of the boot module are:
The MMIO bus sub-module contains only the master interface. Therefore despite the
general rule there is no MODULE_ID for the boot module and the master interface
module can only perform writes. It does not perform reads from other modules sitting
on the DCS bus. As a master, this module writes full 32-bit words to the DCS bus.
These write requests are then routed to the appropriate MMIO register or to the MMI.
Depending on the state of the BOOTMODE[1:0] pins, the I
activated after the reset is released. If the BOOTMODE[1:0] is equal to 0x3 then the
boot module takes over the control of the I
external EEPROM is decoded by the boot state machine. The MMIO bus sub-module
is activated to write data on the DCS bus per the command encoding described in
Section
there will be no other bus masters during the boot process. However, the I
does allow clock stretching by the slave (here the EEPROM). The clock stretching is
not expected from the EEPROM but the feature is there in order to meet the I
2
1. The MMIO to the DCS bus interface.
2. The I
3. The Boot Control & State Machine.
4. The Internal Scripts (detailed in
C Master
Boot Module
27 MHz
(clk_27)
MMIO to DCS
Bus Interface
2.3. The I
2
C Master Interface & Control.
2
C master does not arbitrate for the I
Rev. 1 — 17 March 2006
Internal
Boot
Script
peri_rst_n
I
2
#1
RESET Module
C Control
#2
PNX17xx
Section
2
C interface. The data received from the
3.)
I
2
8
2
C
BOOT_MODE[7:0]
2
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Optional 2 to
64 Kilobytes
EEPROM
with custom
C bus since it is expected that
PNX17xx Series
2
C master interface gets
Chapter 6: Boot Module
2
C master
2
C
6-4