Mmc Interface - Siemens SXG 75 Service Repair Documentation

20 MMC interface

Reduced size MMC are supported. The card interface is supplied from VREG_AUX1 (2.85V). Card
insertion is detected by the MMC_CD line. This line is an input to a MSM6250 port. The line has an
external pull-up (R1400) to VREG_MSME. When a card is inserted, the MMC_CD line is pulled to
ground by an internal connection in the card. This causes an interrupt to be generated to the
MSM6250.
The MMC interface lines are MMC_DATA, MMC_CLK, and MMC_CMD. These lines are connected
directly to MSM6250 ports. Note that MMC_DATA and MMC_CMD ports on the MSM6250 are 3
volt-tolerant.
The MMC clock is programmable by the MSM6250 and is set to 9.6 MHz (maximum possible
operating frequency, when the MMC clock is derived from the 19.2MHz VCTXO).
Technical Documentation
TD_Repair_L3_SXG75_R1.0.pdf
Company Confidential
2006©BenQ
Release 1.0
01/2006
Page 71 of 73