CS5530 datasheet(186/241 Pages) NSC

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186

Revision 4.1

Offset 0Ah

IDE Bus Master 1 Status Register — Secondary (R/W)

Reset Value = 00h

Simplex Mode (Read Only): Can both the primary and secondary channel operate independently? 0 = Yes;

1 = No (simplex mode)

Drive 1 DMA Capable: Allow Drive 1 to be capable of DMA transfers: 0 = Disable; 1 = Enable.

Drive 0 DMA Capable: Allow Drive 0 to be capable of DMA transfers: 0 = Disable; 1 = Enable.

4:3

Reserved: Set to 0. Must return 0 on reads.

Bus Master Interrupt: Has the bus master detected an interrupt? 0 = No; 1 = Yes.

Write 1 to clear.

Bus Master Error: Has the bus master detected an error during data transfer? 0 = No; 1 = Yes.

Write 1 to clear.

Bus Master Active (Read Only): Is the bus master active? 0 = No; 1 = Yes.

Offset 0Bh

Not Used

Offset 0Ch-0Fh

IDE Bus Master 1 PRD Table Address — Secondary (R/W)

Reset Value = 00000000h

31:2

Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for IDE Bus Master 1.

When written, this register points to the first entry in a PRD table. Once IDE Bus Master 1 is enabled (Command Register

bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.

When read, this register points to the next PRD.

1:0

Reserved: Set to 0.

Offset 10h-1Fh

Not Used

Offset 20h-23h

Channel 0 Drive 0 PIO Register (R/W)

Reset Value = 0000E132h (Note)

If Offset 24h[31] = 0, Format 0: Selects slowest PIOMODE per channel for commands.

Format 0 settings for: PIO Mode 0 = 00009172h

PIO Mode 1 = 00012171h

PIO Mode 2 = 00020080h

PIO Mode 3 = 00032010h

PIO Mode 4 = 00040010h

31:20

Reserved: 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 Offset 24h[31] = 1, Format 1: Allows independent control of command and data.

Format 1 settings for: PIO Mode 0 = 9172D132h

PIO Mode 1 = 21717121h

PIO Mode 2 = 00803020h

PIO Mode 3 = 20102010h

PIO Mode 4 = 00100010h