MSC8144ADS Freescale, MSC8144ADS Datasheet - Page 25

• Manufacturer Part Number: MSC8144ADS
• Manufacturer: Freescale

Specifications of MSC8144ADS

• Lead Free Status / RoHS Status: Compliant

5
ADS Functional Description
The ADS functional components are described in the following sections.
5.1 MSC8144 Memory System
The MSC8144ADS has two types of memory devices: DDR2 and DDR1.
5.1.1 DDR2
The DDR2 device is a SODIMM made by Micron (MT8HTF6464HDY-53E), with 512 Mbyte
and rated at 533 MHz, with a width of 64bits. Half of its width is used (32 bits), in the 4 × 8-bit
mode, giving a maximum effective capacity of 256 Mbyte. The DDR2 draws 1.8 V from the
TPS51116 power supply on the MSC8144ADS.
5.1.2
DDR1
The MSC8144ADS can use two DDR1 SODIMM modules. These have ECC functionality and
include 3 or 5 DDR1 parts with a 16- or 8-bit size, respectively. The DDR1 modules each draw
2.6 V from TPS51116 power supply on the MSC8144ADS.
5.1.3 DDR Connection
The main memory module used is the Micron DDR2 SODIMM MT8HTF6464HDY-53E, with
512 Mbyte, working at 533 Hz, and 64 bits wide. However, since the MSC8144 has a 32-bit
DDR memory controller, therefore, only half of the DDR2 device capacity is utilized and only
half of the data port DQ[31–0] must be connected. Another result of this is that the SODIMM
effective volume is 256 Mbyte.
Address and control lines are terminated to VTT on the universal DDR power supply
(TPS51116) that provides power to the DDR1 memory as well. SODIMM Data Lines omitted in
the interface are terminated to VDD. When the MSC8144 Memory controller (which has a
maximum size of 32 bits) is configured to have a 16-bit port size, the unused 16-bits are tied to
VDD. The ECC byte remains the same as for a 32-bit configuration.
MSC8144ADS MSC8144, Rev. 0
Freescale Semiconductor
5-1