AMD Geode SC1201 User Manual

Page 257

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AMD Geode™ SC1200/SC1201 Processor Data Book

257

Core Logic Module - IDE Controller Registers - Function 2

32579B

Index 30h-3Fh

Reserved

Reset Value: 00h

Index 40h-43h

Channel 0 Drive 0 PIO Register (R/W)

Reset Value: 00009172h

If Index 44h[31] = 0, Format 0. Bits [15:0] configure the same timing control for both command and data.

Format 0 settings for a Fast-PCI clock frequency of 33.3 MHz:

— PIO Mode 0 = 00009172h
— PIO Mode 1 = 00012171h
— PIO Mode 2 = 00020080h
— PIO Mode 3 = 00032010h
— PIO Mode 4 = 00040010h

Format 0 settings for a Fast-PCI clock frequency of 66.7 MHz:

— PIO Mode 0 = 0000F8E4h
— PIO Mode 1 = 000153F3h
— PIO Mode 2 = 000213F1h
— PIO Mode 3 = 00034231h
— PIO Mode 4 = 00041131h

Note:

All references to “cycle” in the following bit descriptions are to a Fast-PCI clock cycle.

31:20

Reserved. Must be set to 0.

19:16

PIOMODE. PIO mode.

15:12

t2I. Recovery time (value + 1 cycle).

11:8

t3. IDE_IOW# data setup time (value + 1 cycle).

7:4

t2W. IDE_IOW# width minus t3 (value + 1 cycle).

3:0

t1. Address Setup Time (value + 1 cycle).

If Index 44h[31] = 1, Format 1. Bits [31:0] allow independent timing control of command and data.

Format 1 settings for a Fast-PCI clock frequency of 33.3 MHz:

— PIO Mode 0 = 9172D132h
— PIO Mode 1 = 21717121h
— PIO Mode 2 = 00803020h
— PIO Mode 3 = 20102010h
— PIO Mode 4 = 00100010h

Format 1 settings for a Fast-PCI clock frequency of 66.7 MHz:

— PIO Mode 0 = F8E4F8E4h
— PIO Mode 1 = 53F3F353h
— PIO Mode 2 = 13F18141h
— PIO Mode 3 = 42314231h
— PIO Mode 4 = 11311131h

Note:

All references to “cycle” in the following bit descriptions are to a Fast-PCI clock cycle.

31:28

t2IC. Command cycle recovery time (value + 1 cycle).

27:24

t3C. Command cycle IDE_IOW# data setup (value + 1 cycle).

23:20

t2WC. Command cycle IDE_IOW# pulse width minus t3 (value + 1 cycle).

19:16

t1C. Command cycle address setup time (value + 1 cycle).

15:12

t2ID. Data cycle recovery time (value + 1 cycle).

11:8

t3D. Data cycle IDE_IOW# data setup (value + 1 cycle).

7:4

t2WD. Data cycle IDE_IOW# pulse width minus t3 (value + 1 cycle).

3:0

t1D. Data cycle address Setup Time (value + 1 cycle).

Table 6-35. F2: PCI Header/Channels 0 and 1 Registers for IDE Controller Configuration (Continued)

Bit

Description

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