AT91F_MCI_CfgPIO();//AT91F_PIO_CfgPeriph();
AT91F_MCI_CfgPMC();//AT91F_PMC_EnablePeriphClock(AT91C_ID_MCI);
AT91F_PDC_Open(AT91C_BASE_PDC_MCI);
// Configure MCI interrupt
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC,
AT91C_ID_MCI,
AT91C_AIC_PRIOR_HIGHEST,
AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE,
AT91F_ASM_MCI_Handler);

// Enable MCI interrupt
AT91F_AIC_EnableIt(AT91C_BASE_AIC,AT91C_ID_MCI);
AT91F_MCI_Configure(AT91C_BASE_MCI,
(AT91C_MCI_DTOMUL_1048576 | AT91C_MCI_DTOCYC) ,
// 15MHz for MCK = 60MHz (CLKDIV = 1)
(AT91C_MCI_MR_PDCMODE | 1),
AT91C_MCI_SDCARD_4BITS_SLOTA );

read_block:
AT91C_BASE_PDC_MCI->PDC_PTCR = (AT91C_PDC_TXTDIS | AT91C_PDC_RXTDIS);
AT91C_BASE_PDC_MCI->PDC_RPR = (unsigned int)dataBuffer;
AT91C_BASE_PDC_MCI->PDC_RCR = sizeToRead;

AT91F_MCI_SendCommand(pMCI_Device, AT91C_READ_SINGLE_BLOCK_CMD, src, 0);

// Enable AT91C_MCI_RXBUFF Interrupt
AT91C_BASE_MCI->MCI_IER = AT91C_MCI_RXBUFF;

// (PDC) Receiver Transfer Enable
AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_RXTEN;

void AT91F_MCI_Handler(void){
int status;

status = ( AT91C_BASE_MCI->MCI_SR & AT91C_BASE_MCI->MCI_IMR );
AT91F_MCI_Device_Handler(&MCI_Device,status);
}

ASM_ISR.s:
IRQ Entry
ldr r1, =AT91F_MCI_Handler
mov r14, pc
bx r1
IRQ Exit