Analog Devices ADSP-SC58 Series Hardware Reference Manual page 1352

Normal Boot Operation
8. Program the Rx FIFO threshold value in bytes in the
be set to half the FIFO depth.
9. Program the following fields: MSI_CMD.STARTCMD =1'b1, MSI_CMD.BOOTEN =1'b1,
MSI_CMD.XPECTBOOTACK (for start-acknowledge pattern ACK from the card) and MSI_CMD.DXPECT
=1'b1.
10. If MSI_CMD.XPECTBOOTACK =1'b1, the software driver must start a timer after step 9; the terminal value is
50 ms.
• Before this timer elapses, the BAR interrupt should be received from the MSI. If this action does not oc-
cur, program the CMD register as follows:
MSI_CMD.STARTCMD =1'b1
MSI_CMD.BOOTDIS =1'b1
All other fields = 0
• The MSI generates a Command Done (CD) interrupt after de-asserting the CMD line of the card. In
IDMAC:
Descriptor is closed
MSI_IDSTS.CES =1, indicating BAR timeout
MSI_IDSTS.RI =0
• If the BAR interrupt is received, the software should clear this interrupt by writing a 1 to it. The software
should then start another timer with a terminal value of 1 – 0.05 = 0.95 seconds. Before this timer elapses,
the BDS interrupt should be received from the MSI. If this action does not occur, the software driver
must program the CMD register as follows:
MSI_CMD.STARTCMD =1'b1
MSI_CMD.BOOTDIS =1'b1
All other fields =0
• The MSI generates a CD interrupt after de-asserting the CMD line of the card. In IDMAC:
Descriptor is closed
MSI_IDSTS.CES =1, indicating BDS timeout
MSI_IDSTS.RI =0
• If the BDS interrupt is received, it indicates that the boot data is being received from the card. The ID-
MAC engine starts transferring the data from the FIFO to the system memory as soon as the programmed
RX_WMark level is attained. At the end of a successful boot data transfer from the card, the following
interrupts are generated:
Command Done (CD) with the MSI_ISTAT.CMDDONE bit
26–46
MSI_FIFOTH
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
register. Typically, the threshold value can