SC2200 datasheet(263/433 Pages) NSC

263 / 433 page

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Core Logic Module (Continued)

Index 40h-43h

Channel 0 Drive 0 PIO Register (R/W)

Reset Value: 00009172h

If Index 44h[31] = 0, Format 0. The bits in this register select the slowest PIO mode per channel for commands.

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 48 MHz:

— PIO Mode 0 = 0000FAA3h

— PIO Mode 1 = 0001C232h

— PIO Mode 2 = 00025131h

— PIO Mode 3 = 00033121h

— PIO Mode 4 = 00041021h

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

— PIO Mode 0 = 0000FFF4h

— PIO Mode 1 = 0001F353h

— PIO Mode 2 = 00028141h

— 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. The bits in this register allow independent 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 48 MHz:

— PIO Mode 0 = E2A3F383h

— PIO Mode 1 = 42A2B232h

— PIO Mode 2 = 11B16121h

— PIO Mode 3 = 31213121h

— PIO Mode 4 = 10211021h

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.