USB2227/USB2228
DS00002256A-page 4 2007-2016 Microchip Technology Inc.
1.0 GENERAL DESCRIPTION
The USB2227/USB2228 is a USB 2.0 Bulk Only Mass Storage Class Peripheral Controller intended for supporting Com-
pactFlash (CF and CF Ultra I/II) in True IDE Mode only, SmartMedia (SM) and XD cards, Memory Stick (MS), Memory
Stick DUO (MSDUO) and Memory Stick Pro (MSPRO), Secure Digital (SD), and MultiMediaCard (MMC) flash memory
devices. It provides a single chip solution for the most popular flash memory cards in the market.
The device consists of a USB 2.0 PHY and SIE, buffers, Fast 8051 microprocessor with expanded scratchpad, and pro-
gram SRAM, and CF, MS, SM and SD controllers. The SD controller supports both SD and MMC devices. SM controller
supports both SM and xD cards.
Provisions for external Flash Memory up to 64K bytes for program storage is provided.
12K bytes of scratchpad SRAM and 768 Bytes of program SRAM are also provided.
Fifteen GPIO pins are provided for indicators, external serial EEPROM for OEM id and system configuration information,
and other special functions.
Internal power FETs are provided to directly supply power to the xD/SM, MMC/SD and MS/MSPro cards.
The internal ROM program is capable of implementing any combination of single or multi-LUN CF/SD/MMC/SM/MS
reader functions with individual card power control and activity indication. Microchip also provides licenses** for Win98
and Win2K drivers and setup utilities. Note: Please check with Microchip for precise features and capabilities for the
current ROM code release.
1.1 Acronyms
SM: SmartMedia
SMC: SmartMedia Controller
FM: Flash Media
FMC: Flash Media Controller
CF: Compact Flash
CFC: CompactFlash Controller
SD: Secure Digital
SDC: Secure Digital Controller
MMC: MultiMediaCard
MS: Memory Stick
MSC: Memory Stick Controller
TPC: Transport Protocol Code.
ECC: Error Checking and Correcting
CRC: Cyclic Redundancy Checking
