82801FB Datasheet, PDF (468/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

SATA Controller Registers (D31:F2)
12.1.23 SDMA_CNT—Synchronous DMA Control Register
(SATA–D31:F2)
Address Offset: 48h
Default Value: 00h
Attribute: R/W
Size:
8 bits
Note: This register is R/W to maintain software compatibility and enable parallel ATA functionality when
the PCI functions are combined. These bits have no effect on SATA operation unless otherwise
noted.
Bit
Description
7:4 Reserved
Secondary Drive 1 Synchronous DMA Mode Enable (SSDE1) — R/W.
3
0 = Disable (default)
1 = Enable Synchronous DMA mode for secondary channel drive 1
Secondary Drive 0 Synchronous DMA Mode Enable (SSDE0) — R/W.
2
0 = Disable (default)
1 = Enable Synchronous DMA mode for secondary drive 0.
Primary Drive 1 Synchronous DMA Mode Enable (PSDE1) — R/W.
1
0 = Disable (default)
1 = Enable Synchronous DMA mode for primary channel drive 1
Primary Drive 0 Synchronous DMA Mode Enable (PSDE0) — R/W.
0
0 = Disable (default)
1 = Enable Synchronous DMA mode for primary channel drive 0
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet