Analog Devices ADSP-SC58 Series Hardware Reference Manual page 1370

ADSP-SC58x MSI Register Descriptions
Table 26-25: MSI_CMD Register Fields (Continued)
Bit No.
(Access)
29 USEHOLDREG
(R/W)
27 BOOTMODE
(R/W)
26 BOOTDIS
(R/W)
25 XPECTBOOTACK
(R/W)
24 BOOTEN
(R/W)
26–64
Bit Name
Use Hold Reg.
When the MSI_CMD.USEHOLDREG bit is set, CMD and DATA are sent to the card
through the HOLD register. When the MSI_CMD.USEHOLDREG bit is cleared,
CMD and DATA are sent to the card bypassing the HOLD register.
Boot Mode.
When the MSI_CMD.BOOTMODE bit is set, the MSI has an alternate boot operation.
When the MSI_CMD.BOOTMODE bit is cleared, the MSI has a mandatory boot oper-
ation.
Disable Boot.
When the MSI_CMD.BOOTDIS bit is set with the MSI_CMD.STARTCMD bit, the
CIU terminates the boot operation. Do NOT set MSI_CMD.BOOTDIS and
MSI_CMD.BOOTEN together.
Expect Boot Ack.
When the MSI_CMD.XPECTBOOTACK bit is set with with the
MSI_CMD.BOOTEN bit, the CIU expects a boot acknowledge start pattern of 0-1-0
from the selected card.
Enable Boot.
The MSI_CMD.BOOTEN bit should be set only for mandatory boot mode. When
software sets this bit along with the MSI_CMD.STARTCMD bit, CIU starts the boot
sequence for the corresponding card by asserting the CMD line low. Do NOT set the
MSI_CMD.BOOTEN bit and the MSI_CMD.BOOTDIS bit together.
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
Description/Enumeration
0 CMD and DATA sent to card bypassing the HOLD
register
1 CMD and DATA sent to card through the HOLD reg-
ister
0 Mandatory Boot
1 Alternate Boot
0 No action
1 Terminate boot
0 No ACK expected
1 ACK expected