CM120 C-Media Electronics, Inc., CM120 Datasheet - Page 19

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CM120

Manufacturer Part Number
CM120
Description
Usb 7-in-1 Combo Card Reader Controller
Manufacturer
C-Media Electronics, Inc.
Datasheet

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Date: 09/09/2003
XCF-S1N XCF-CS0N XCF_SA2 XCF_SA1 XCF_SAD XCF_IORN=0
4.5 SD/MMC INTERFACE PROTOCOL
data command( In/Out ), PIO non-data command which may be referenced by “ Information
Technology - AT Attachment with Packet Interface Extension (ATA/ATAPI-4) Working Draft, Revision
18, 19 August 1998“ from p.223 to p.232. This protocol is used for the communication with C-Media
CF flash cards that are viewed as the IDE device.
Command, Data bus and Power Line) designed to operate in a low voltage range. The both
communication protocols are SD and SPI.
1. SD/MMC bus
1
1
1
1
1
1
1
1
0
0
After the pattern of the CF bus cycle is known, it also needs to know the protocol of the PIO
The SD/MMC communication is based on an advanced 9-pin interface (Clock,
0
0
0
0
0
0
0
0
1
1
Figure 6:”no response” and “no data” operations
0
0
0
0
1
1
1
1
1
1
Table 7:CF True IDE Mode I/O Decoding
0
0
1
1
0
0
1
1
1
1
- 18 -
0
1
0
1
0
1
0
1
0
1
USB 7-in-1 Combo Card Reader Controller
RD DATA
ERROR REGISTER
SECTOR COUNT
SECTOR NO.
CYLINDER LOW
CYLINDER HIGH
SELECT CARD/HEAD SELECT CARD/HEAD
STATUS
ALL STATUS
DRIVE ADDRESS
CXF_IOWN=0
WR DATA
FEATURES
SECTOR COUNT
SECTOR NO.
CYLINDER LOW
CYLINDER HIGH
COMMAND
DEVICE CONTROL
RESERVED
Version: 1.3
CM120

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