W83977F-A Datasheet, PDF (137/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
CR60, CR 61 (Default 0x03, 0x78 at PNPCSV=0)
These two registers select Parallel Port I/O base address.
[0x100:0xFFC] on 4 byte boundaries(EPP not supported) or
[0x100:0xFF8] on 8 byte boundaries(all modes supported, EPP is only available when the base
address is on an 8byte boundary).
CR70 (Default 0x07 when PNPCSV=0 at POR)
Bit 7-4 : Reserved.
Bit [3:0] : These bits select IRQ resource for Parallel Port.
CR71 (Default 0x02, read only)
Bit 7-2 : Reserved.
Bit 1 : IRQLEV -- > IRQ Level
= 1: High; = 0: Low
Bit 0 : IRQTYPE --> IRQ Type
= 1: Level trigger; = 0: Edge trigger
CR74 (Default 0x04)
Bit 7-3 : Reserved.
Bit 2-0 : These bits select DRQ resource for Parallel Port.
0x00=DMA0
0x01=DMA1
0x02=DMA2
0x03=DMA3
0x04-0x07= No DMA active
CRF0 (Default 0x3F)
Bit 7 : PP Interrupt Type:
Not valid when the parallel port is in the printer Mode (100) or the standard & Bi-directional
Mode (000).
= 1 Pulsed Low, released to high-Z .
= 0 IRQ follows nACK when parallel port in EPP Mode or [Printer, SPP, EPP] under ECP.
Bit [6:3] : ECP FIFO Threshold.
Bit 2-0 Parallel Port Mode (CR F1 PRTMODS2= logical 1)
= 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
= 010 ECP mode
= 011 ECP and EPP-1.9 mode
= 111 ECP and EPP-1.7 mode.
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Publication Release Date: May 2006
Revision 0.60