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IFB Usage Considerations
10-4 Intel® 460GX Chipset Software Developer’s Manual
For IFB IDE Timing Configuration, each of the following things must be determined:
• Drive Type: ATAPI or ATA (non-ATAPI)
• Best DMA Capability
• Best Ultra DMA Capability OR
• Best Multi Word DMA Capability (if Ultra DMA not supported) OR
• Best Single Word DMA Capability (if neither Ultra DMA nor Multi Word DMA supported)
• Best PIO Capability
DMA 62 10:8 Single Word DMA Modes Active
bit 10: 1: Single Word DMA Mode 2 is active
0: Single Word DMA Mode 2 is not active
bit 9: 1: Single Word DMA Mode 1 is active
0: Single Word DMA Mode 1 is not active
bit 8: 1: Single Word DMA Mode 0 is active
0: Single Word DMA Mode 0 is not active
DMA 62 2:0 Single Word DMA Modes Supported
bit 2: 1: Single Word DMA Mode 2 is supported
0: Single Word DMA Mode 2 is not supported
bit 1: 1: Single Word DMA Mode 1 is supported
0: Single Word DMA Mode 1 is not supported
bit 0: 1: Single Word DMA Mode 0 is supported
0: Single Word DMA Mode 0 is not supported
DMA 63 10:8 Multi Word DMA Modes Active
bit 10: 1: Multi Word DMA Mode 2 is active
0: Multi Word DMA Mode 2 is not active
bit 9: 1: Multi Word DMA Mode 1 is active
0: Multi Word DMA Mode 1 is not active
bit 8: 1: Multi Word DMA Mode 0 is active
0: Multi Word DMA Mode 0 is not active
DMA 63 2:0 Multi Word DMA Modes Supported
bit 2: 1: Multi Word DMA Mode 2 is supported
0: Multi Word DMA Mode 2 is not supported
bit 1: 1: Multi Word DMA Mode 1 is supported
0: Multi Word DMA Mode 1 is not supported
bit 0: 1: Multi Word DMA Mode 0 is supported
0: Multi Word DMA Mode 0 is not supported
DMA 65 15:0 Minimum Multi Word DMA Transfer Cycle Time Per Word
PIO 51 15:8 PIO Data Transfer Cycle Timing Mode Supported
00h: PIO0
01h: PIO1
02h: PIO2
PIO, DMA 53 1 Field Validity
0: the fields reported in words 64-70 are not valid
1: the fields reported in word 64-70 are valid
PIO 64 7:0 Advanced Flow Control PIO Transfer Modes Supported
bit 0: PIO3 (w/IORDY Flow Control)
bit 1: PIO4 (w/IORDY Flow Control)
PIO 68 15:0 Minimum PIO Transfer Cycle Time with IORDY Flow Control
Table 10-1. Identify Device Information Used for Determining Drive Capabilities (Cont’d)
Capability
Word
Offset
Bits Field