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W83977EF-AW Datasheet(PDF) 96 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 96 Page - Winbond |
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96 / 142 page  W83977EF-AW/W83977EG-AW -94- 12.3 Logical Device 1 (Parallel Port) CR30 (Default 0x01 if PNPCSV# = 0 during POR, default 0x00 otherwise) Bit 7 - 1: Reserved. Bit 0: = 1 Activates the logical device. = 0 Logical device is inactive. CR60, CR 61 (Default 0x03, 0x78 if PNPCSV# = 0 during POR, default 0x00, 0x00 otherwise) 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). CR70 (Default 0x07 if PNPCSV# = 0 during POR, default 0x00 otherwise) Bit 7 - 4: Reserved. Bit [3:0]: These bits select IRQ resource for Parallel Port. 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 = 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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