AN2654 Freescale Semiconductor / Motorola, AN2654 Datasheet

no-image

AN2654

Manufacturer Part Number
AN2654
Description
Interfacing SDRAM Devices to the MPC8280 at 100 MHz
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
Application Note
AN2654
Rev. 0, 2/2004
Interfacing SDRAM Devices
to the MPC8280 at 100 MHz
NCSD Applications,
East Kilbride,
Scotland
The demand for ever higher bus frequencies when using MPC8260 PowerQUICC II™
communications processors has led to the introduction of the enhanced MPC8280
PowerQUICC II family—the MPC8280, the MPC8275, and the MPC8270 (collectively
referred to in this document as the MPC8280). PowerQUICC II family members contain
PowerPC™ processor cores.
This document discusses the interface of SDRAM memory devices using the MPC8280
on-chip SDRAM controller operating with a bus frequency of 100 MHz.
1 Introduction
The MPC8280 is similar to the MPC8260 family of devices except that it has been
implemented in Motorola’s advanced .13-µm (HiP7) process, which allows the devices to
operate at higher clock frequencies.
The major enhancements to the MPC8280 compared with earlier MPC8260 devices are as
follows:
The increased bus frequency of 100 MHz leads to some restrictions on the interface bus due
to the shorter cycle time. These restrictions require the use of faster memory devices with
reduced setup and hold time requirements. We will now consider the bus interface in more
detail.
System core microprocessor supporting frequencies of 166–450 Mhz
CPM dual-port RAM (original MPC8260 has the 24 Kbytes)
— 32 Kbytes CPM RISC data RAM for storage of protocol parameters
— 32 Kbytes CPM RISC instruction RAM for storage of CPM microcode
Reduced core supply voltage of 1.45–1.6 V
Bus frequency of 100 MHz
Communication interfaces
— ATM: Extended number of PHYs for FCC2 (MPC8280 only)
— Internal rate scheduling for 31 PHYs
— RMII interface
Universal serial bus (USB) controller
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com

Related parts for AN2654

AN2654 Summary of contents

Page 1

... Freescale Semiconductor, Inc. Application Note AN2654 Rev. 0, 2/2004 Interfacing SDRAM Devices to the MPC8280 at 100 MHz NCSD Applications, The demand for ever higher bus frequencies when using MPC8260 PowerQUICC II™ East Kilbride, communications processors has led to the introduction of the enhanced MPC8280 Scotland PowerQUICC II family— ...

Page 2

Freescale Semiconductor, Inc. Bus Interface Timing Specifications Bus Interface Timing Specifications 2 Bus Interface Timing Specifications The interaction of several of the 60x bus interface signals is shown in Figure 1. Table 1 and Table 2 show the timing parameters ...

Page 3

Freescale Semiconductor, Inc. Table 1. AC Characteristics for SIU Inputs Spec Number Setup Hold sp11 sp10 AACK/TA/TS/DBG/BG/BR sp11a sp10 ARTRY/ TEA sp12 sp10 Data bus in normal mode sp13 sp10 Data bus in ECC and PARITY modes sp13a sp10 Pipeline ...

Page 4

Freescale Semiconductor, Inc. Interface to SDRAM at 100 MHz Interface to SDRAM at 100 MHz 3 Interface to SDRAM at 100 MHz The on-chip SDRAM controller on the MPC8280 is designed to provide a ‘glueless’ interface to standard SDRAM devices ...

Page 5

Freescale Semiconductor, Inc. If system with a clock driver with a 0.1-ns skew between the SDRAM clock and the MPC8280 clock, we assume an equal track length between the clock driver and the MPC8280 and the clock driver ...

Page 6

Freescale Semiconductor, Inc. Conclusion Conclusion THIS PAGE INTENTIONALLY LEFT BLANK 6 Interfacing SDRAM Devices to the MPC8280 at 100 MHz For More Information On This Product, Go to: www.freescale.com MOTOROLA ...

Page 7

Freescale Semiconductor, Inc. THIS PAGE INTENTIONALLY LEFT BLANK MOTOROLA Interfacing SDRAM Devices to the MPC8280 at 100 MHz For More Information On This Product, Go to: www.freescale.com Conclusion 7 ...

Page 8

... The PowerPC name is a trademark of IBM Corp. and used under license. All other product or service names are the property of their respective owners. Motorola, Inc Equal Opportunity/Affirmative Action Employer. © Motorola, Inc. 2004 AN2654 For More Information On This Product, Go to: www.freescale.com ...

Related keywords