User Manual

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1. Introduction to the TriFlash with SD Interface

The SanDisk TriFlash is a very small, flash storage device, designed specifically for storage applications that put a

premium on small form factor, low power and low cost. Flash is the ideal storage medium for portable, battery-

powered devices. It features low power consumption and is non-volatile, requiring no power to maintain the stored

data. It also has a wide operating range for temperature, shock and vibration.

TriFlash is well suited to meet the needs of small, low power, electronic devices. With a form factor as small as 10

mm by 12 mm and 1.1 mm thick, TriFlash is expected to be used in a wide variety of portable devices like mobile

phones, pagers, and voice recorders.

To support this wide range of applications, the TriFlash is offered with either the MultiMediaCard (see TriFlash

with MultiMediaCard Interface Product Manual) or Secure Digital (SD) interface. The SD interface product is fully

compatible with SD cards, provides a 4-bit data bus for maximum performance, and, optionally, has the full SD

security features. For compatibility with existing controllers, the TriFlash offers, in addition to these interfaces, an

alternate communication protocol based on the SPI standard.

These interfaces allow for easy integration into any design, regardless of microprocessor used. All device and

interface configuration data (such as maximum frequency and card identification) are stored on the device.

The TriFlash provides up to 1024 million bits of memory using SanDisk Flash memory chips, which were designed

by SanDisk especially for use in mass storage applications. In addition to the mass storage specific flash memory

chip, the TriFlash includes an intelligent controller, which manages interface protocols, and data storage and

retrieval, as well as Error Correction Code (ECC) algorithms, defect handling and diagnostics, power management

and clock control. Figure 1-1 is a block diagram of the TriFlash with SD Interface.

SanDisk TriFlash

Data

In/Ou

Contro

SanDisk

Single

Chip

Controlle

Data

Flash

Module

SD Bus/SPI Bus

Interface

Figure 1-1. TriFlash with SD Interface Block Diagram