w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 144

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

CR2E (Default 0x00)
CR2F (Default 0x00)
14.2 Logical Device 0 (FDC)
CR30 (Default 0x01 if PNPCSV = 0 during POR, default 0x00 otherwise)
CR60, CR 61 (Default 0x03, 0xf0 if PNPCSV = 0 during POR, default 0x00, 0x00 otherwise)
CR70 (Default 0x06 if PNPCSV = 0 during POR, default 0x00 otherwise)
CR74 (Default 0x02 if PNPCSV = 0 during POR, default 0x04 otherwise)
CRF0 (Default 0x0E)
FDD Mode Register
Bit 7 - 1
Bit 0:
Bit 7 - 4
Bit 3 - 0
Bit 7 - 3
Bit 2 - 0
Bit 7
Test Modes: Reserved for Winbond.
Test Modes: Reserved for Winbond.
These two registers select FDC I/O base address [0x100:0xFF8] on 8 byte boundary.
: Reserved.
= 1 Activates the logical device.
= 0 Logical device is inactive.
: Reserved.
: These bits select IRQ resource for FDC.
: Reserved.
: These bits select DRQ resource for FDC.
= 0x00
= 0x01
= 0x02
= 0x03
= 0x04 - 0x07 No DMA active
: FIPURDWN
This bit controls the internal pull-up resistors of the FDC input pins RDATA, INDEX,
TRAK0, DSKCHG, and WP.
= 0
= 1
The internal pull-up resistors of FDC are turned on.(Default)
The internal pull-up resistors of FDC are turned off.
DMA0
DMA1
DMA2
DMA3
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W83977ATF/W83977ATG