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Silicon Motion SM2246EN SSD Controller Preview - Silicon Motion SM2246EN Reference Design

Silicon Motion SM2246EN SSD Controller Preview
Silicon Motion is looking to take a large portion of LSI SandForce and Marvell's market share with a new 4-channel SSD controller. Let's take a look.
| SSDs in Storage | Posted: Sep 2, 2013 1:01 pm

Silicon Motion SM2246EN Reference Design

 

TweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

Before we dive in and look at the drive we want to preface the rest of this preview. The sample we received is only a reference design. The drive was built for performance using the best NAND on the open market today and the performance shown today does not represent a specific branded product. A manufacture could build a drive like the one we're testing though. The firmware on the reference design could and most likely will change before retail products come to market so the performance today could increase or decrease.

 

TweakTown image silicon_motion_sm2246en_ssd_controller_previewTweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

TweakTown image silicon_motion_sm2246en_ssd_controller_previewTweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

The PCB design doesn't look overly complicated. The controller sits close to the SATA connection and a fair amount of space between the controller, the NAND flash and the DRAM buffer keeps controller heat away from the other components.

 

TweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

There are eight NAND flash packages, four on each side.

 

TweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

Here we get our first look at the new SM2246EN controller.

 

TweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

The flash used is Toshiba 19nm Toggle Type C with 16KB page size. Each package is 16GB in size.

 

TweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

The 256MB DDR3 DRAM buffer is clocked at 800MHz (DDR3-1600) and has 11-11-11 timings.

 

TweakTown image silicon_motion_sm2246en_ssd_controller_preview

 

Our reference design sample uses firmware M0709A and uses the ACS-2 ATA command set. Crystal Disk Info detected the capacity size at 126.5GB, an odd size. We suspect Silicon Motion reserved a small amount of space for background activities.

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