SDHCI_BUFFER
data = RD4(slot, SDHCI_BUFFER);
RD_MULTI_4(slot, SDHCI_BUFFER,
data = RD4(slot, SDHCI_BUFFER);
WR4(slot, SDHCI_BUFFER, data);
WR_MULTI_4(slot, SDHCI_BUFFER,
WR4(slot, SDHCI_BUFFER, data);