Intel 460GX Software Developer’s Manual page 174

IFB Usage Considerations
Table 10-1. Identify Device Information Used for Determining Drive Capabilities (Cont'd)
Capability
DMA
DMA
DMA
DMA
DMA
PIO
PIO, DMA
PIO
PIO
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
10-4
Word
Bits
Offset
62 10:8 Single Word DMA Modes Active
bit 10: 1: Single Word DMA Mode 2 is active
bit 9: 1: Single Word DMA Mode 1 is active
bit 8: 1: Single Word DMA Mode 0 is active
62 2:0 Single Word DMA Modes Supported
bit 2: 1: Single Word DMA Mode 2 is supported
bit 1: 1: Single Word DMA Mode 1 is supported
bit 0: 1: Single Word DMA Mode 0 is supported
63 10:8 Multi Word DMA Modes Active
bit 10: 1: Multi Word DMA Mode 2 is active
bit 9: 1: Multi Word DMA Mode 1 is active
bit 8: 1: Multi Word DMA Mode 0 is active
63 2:0 Multi Word DMA Modes Supported
bit 2: 1: Multi Word DMA Mode 2 is supported
bit 1: 1: Multi Word DMA Mode 1 is supported
bit 0: 1: Multi Word DMA Mode 0 is supported
65 15:0 Minimum Multi Word DMA Transfer Cycle Time Per Word
51 15:8 PIO Data Transfer Cycle Timing Mode Supported
00h: PIO0
01h: PIO1
02h: PIO2
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
64 7:0 Advanced Flow Control PIO Transfer Modes Supported
bit 0: PIO3 (w/IORDY Flow Control)
bit 1: PIO4 (w/IORDY Flow Control)
68 15:0 Minimum PIO Transfer Cycle Time with IORDY Flow Control
Field
0: Single Word DMA Mode 2 is not active
0: Single Word DMA Mode 1 is not active
0: Single Word DMA Mode 0 is not active
0: Single Word DMA Mode 2 is not supported
0: Single Word DMA Mode 1 is not supported
0: Single Word DMA Mode 0 is not supported
0: Multi Word DMA Mode 2 is not active
0: Multi Word DMA Mode 1 is not active
0: Multi Word DMA Mode 0 is not active
0: Multi Word DMA Mode 2 is not supported
0: Multi Word DMA Mode 1 is not supported
0: Multi Word DMA Mode 0 is not supported
Intel® 460GX Chipset Software Developer's Manual