CM120 C-Media Electronics, Inc., CM120 Datasheet - Page 28

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

CM120
USB 7-in-1 Combo Card Reader Controller
Figure 20: MS Write Protocol
Above is the MS write command running chart. Just like the read command, it contains 4 stages:
BS1 stage for command to transmit from host to card. And then data will be transmitted from host
to card during BS2 state with CRC check immediately. After getting the reply during BS3 stage,
both sides will return to BS0 stage and wait, just like what is mentioned in the read command
section.
4.8 USB LOW POWER MODE
The CM120 can be placed in the low power mode by host-issued suspend mode. Both crystal and
PLL will turn off the power, and be held at a logic low power level. The CM120 USB device controller
can wake up host resume signal when DP goes to low state.
Figure 21: Suspend and Resume wakeup state
Date: 09/09/2003
Version: 1.3
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