W83L517D Datasheet, PDF (120/138 Pages) Winbond – LPC SUPER I/O

9.5 Logical Device 0 (FDC)
CR30 (Default 0x01h if PNPCSV = 0 during POR, 0x00h otherwise)
Bit 7 - 1: Reserved.
Bit 0: = 1 Activates the logical device.
= 0 Logical device is inactive.
W83L517D
Version 0.6
CR60, CR 61 (Default 0x03, 0xF0h if PNPCSV = 0 during POR, Default 0x00h, 0x00h otherwise)
These two registers select FDC I/O base address [0x100:0xFF8] on 8 byte boundary.
CR70 (Default 0x06 if PNPCSV = 0 during POR, 0x00h otherwise)
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for FDC.
CR74 (Default 0x02 if PNPCSV = 0 during POR, 0x04h otherwise)
Bit 7 - 3: Reserved.
Bit 2 - 0: These bits select DRQ resource for FDC.
= 0x00h DMA0
= 0x01h DMA1
= 0x02h DMA2
= 0x03h DMA3
= 0x04h - 0x07h No DMA active
CRF0 (Default 0x0Eh)
FDD Mode Register
Bit 7: FIPURDWN
This bit controls the internal pull-up resistors of the FDC input pins RDATA, INDEX, TRAK0,
DSKCHG, and WP.
= 0 The internal pull-up resistors of FDC are turned on.(Default)
= 1 The internal pull-up resistors of FDC are turned off.
Bit 6: INTVERTZ,This bit determines the polarity of all FDD interface signals.
= 0 FDD interface signals are active low.
= 1 FDD interface signals are active high.
Bit 5: DRV2EN (PS2 mode only)
When this bit is a logic 0, indicates a second drive is installed and is reflected in status register A.
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Publication Release Date: Apr. 2000
Revision 0.60