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UPD72012CU-XXX Datasheet(PDF) 20 Page - NEC |
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UPD72012CU-XXX Datasheet(HTML) 20 Page - NEC |
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20 / 36 page  20 Data Sheet S13918EJ3V0DS µPD72012 (4/4) Value Standard ROM code product No. Field Size (Bytes) Contents 003 004 Mask ROM code product 7 bDeviceRemovable 1 Uses a bitmap to show whether or not removable devices are connected to HUB ports. “1” shows that the connected device is non- removable, and “0” shows that it is removable. Set “1” if a port that is used cannot be connected nor disconnected using an external circuit. Note that, if a non-removable device is connected to a downstream port of the HUB, bit 2 of wHubCharacteristics field should be set to “1”. When the number of ports that can be port enabled is limited by the PVSEL pin setting or Mask ROM code product settings, set “0” for all ports that are not port enabled. The meaning of the bitmap is as follows. Bit 0: Always set to “0”. Bit 1: If “1”, the device connected to port 1 is non-removable. Bit 2: If “1”, the device connected to port 2 is non-removable. Bit 3: If “1”, the device connected to port 3 is non-removable. Bit 4: If “1”, the device connected to port 4 is non-removable. Bit 5: If “1”, the device connected to port 5 is non-removable. Bits 7,6: Always set to “0”. For a standard ROM code product (003, 004), all ports are removable. 0x00 0x00 0xXX 8 bPortPwrCtrlMask 1 This field exists for reasons of compatibility with software written for 1.0 compliant devices. All bits in this field should be set to 1B. 0xFF 0xFF 0xFF |
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