Freescale Semiconductor TWR-MEM User guide
TWR-MEM
User’s Manual
Rev. 1.2
Freescale Semiconductor Inc.
Revision
Date
Changes
1.0
Jan, 2010
Initial Release
1.1
Feb 9, 2010
Corrections to SPI Flash, CPLD, and MRAM part numbers
1.2
April 20, 2010
Correction to default setting of J16
Contents
1 Overview ...................................................................................................................................................... 4
2 Reference Documents .............................................................................................................................. 4
3 Hardware Features ................................................................................................................................... 5
3.1 Power Supply ....................................................................................................................................................................... 5
3.2 Serial Flash ............................................................................................................................................................................ 5
3.3 MRAM ...................................................................................................................................................................................... 5
3.4 SD Card .................................................................................................................................................................................... 5
3.5 CompactFlash ....................................................................................................................................................................... 6
3.6 CPLD ......................................................................................................................................................................................... 6
3.7 Elevator Connections ........................................................................................................................................................ 8
4 Jumper Table ........................................................................................................................................... 10
4.1 Mechanical Form Factor ............................................................................................................................................... 11
Revision History
TWR-MEM User’s Manual Page 2 of 11
TWR-MEM User’s Manual Page 3 of 11
Tower Primary Elevator Connector
External Connectors
Interface IC
Power
CompactFlash
Socket
3.3V
SPI1, IRQ, GPIO
SD Card
Socket
Tower Secondary Elevator Connector
CPLD
Spare I/O
SPI
Flash
(1 MB)
MRAM
(512 KB)
Memory Device
SPI0
External Bus Interface (EBI)
JTAG
1 Overview
The Tower Memory Module (TWR-MEM) adds external memory and expansion I/O card support to the
Tower System. It can be used with a wide variety of Tower Processor Modules with an SPI and/or
external bus interface (EBI).
The TWR-MEM features a Serial Flash device, MRAM device, SD™ Card slot, and CompactFlash® slot. A
CPLD is used to interface between the external bus interface (memory bus) of the host processor and
the CompactFlash slot. This CPLD can also be used to prototype custom interfaces. A block diagram
for the TWR-MEM is shown in the figure below.
Figure 1. TWR-MEM Block Diagram
2 Reference Documents
The documents listed below should be referenced for more information on the Freescale Tower
system and the TWR-MEM. Refer to http://www.freesale.com/tower for the latest revision of all
Tower documentation.
TWR-MEM User’s Manual Page 4 of 11
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