w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 148

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

14.3 Logical Device 1 (Parallel Port)
CR30 (Default 0x01 if PNPCSV = 0 during POR, default 0x00 otherwise)
CR60, CR 61 (Default 0x03, 0x78 if PNPCSV = 0 during POR, default 0x00, 0x00 otherwise)
CR70 (Default 0x07 if PNPCSV = 0 during POR, default 0x00 otherwise)
CR74 (Default 0x04)
CRF0 (Default 0x3F)
Bit 7 - 1
Bit 0:
Bit 7 - 4
Bit [3:0]
Bit 7 - 3
Bit 2 - 0
Bit 7
Bit [6:3]
Bit 2 - 0
These two registers select Parallel Port I/O base address.
[0x100:0xFFC] on 4 byte boundary (EPP not supported) or
[0x100:0xFF8] on 8 byte boundary (all modes supported, EPP is only available when the base
address is on 8 byte boundary).
: Reserved.
= 1
= 0
: Reserved.
: These bits select IRQ resource for Parallel Port.
: Reserved.
: These bits select DRQ resource for Parallel Port.
0x00=DMA0
0x01=DMA1
0x02=DMA2
0x03=DMA3
0x04 - 0x07= No DMA active
: PP Interrupt Type:
Not valid when the parallel port is in the printer Mode (100) or the standard & Bi-
directional Mode (000).
= 1
= 0
under ECP.
: ECP FIFO Threshold.
: Parallel Port Mode
= 100 Printer Mode (Default)
= 000 Standard and Bi-direction (SPP) mode
= 001 EPP - 1.9 and SPP mode
= 101 EPP - 1.7 and SPP mode
Logical device is inactive.
Pulsed Low, released to high-Z.
IRQ follows nACK when parallel port in EPP Mode or [Printer, SPP, EPP]
Activates the logical device.
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W83977ATF/W83977ATG