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Document Reference No.: FT_000006
Vinculum Firmware User Manual Version 2.05
Clearance No.: FTDI# 46
6.3.1 Suspend Disk (SUD)
Summary
Automatically suspend disk devices when not in use.
Parameters
None
Remarks
Puts the VNC1L into a mode where the disk is automatically suspended when it is not in use. It
is woken up each time a monitor command is called. This only needs to be called once to
enable the mode. Disable the mode by calling the Wake Disk command.
There is a large latency in accessing all disks in Suspend Disk Mode. If frequent or rapid access
to data on a disk is required then the Wake Disk command should be called before the data is
accessed.
Important: Due to the variability of the quality of BOMS devices (especially USB Flash Disks)
it is not always possible to reliably suspend and restore disks.
It is highly recommended that the disk should not be suspended while a file is opened for write
or read. It is also prudent to test and verify different makes and models disks before
deployment.
Error Codes
File Open – A file is currently open for reading or writing. Close the file first before retrying this
command.
No Disk – There is no disk detected by the firmware.
6.3.2 Wake Disk (WKD)
Summary
Keep disks active when not in use.
Parameters
None
Remarks
This command turns off the automatic suspended mode which is enabled by the Suspend Disk
command. It should be called before transferring large amounts of data to or from a disk.
Error Codes
No Disk – There is no disk detected by the firmware.
6.3.3 Suspend Monitor (SUM)
Summary
Move the VNC1L to a low power suspend mode.
Parameters
None
Remarks
This command turns off all internal clocks and suspends both USB hosts. The monitor is
disabled, whether it is on UART, SPI or FIFO. The monitor is started again by toggling the Ring
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