
I/O Software Control in Low-Power Flash Devices
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In addition, there are six single-ended I/Os used that have the same VCCI voltage. Since two banks
are already assigned with the same VCCI voltage and there are enough unused bonded I/Os in those
banks, the user does not need to assign the same VCCI voltage to another bank. The user needs to
assign the other three VCCI voltages to three more banks.
Assigning Technologies and VREF to I/O Banks
Low-power flash devices offer a wide variety of I/O standards, including voltage-referenced
standards. Before proceeding to Layout, each bank must have the required VCCI voltage assigned
for the corresponding I/O technologies used for that bank. The voltage-referenced standards
require the use of a reference voltage (VREF). This assignment can be done manually or
automatically. The following sections describe this in detail.
Manually Assigning Technologies to I/O Banks
The user can import the PDC at this point and resolve this requirement. The PDC command is
set_iobank [bank name] –vcci [vcci value]
Another method is to use the I/O Bank Settings dialog box (MVN > Edit > I/O Bank Settings) to set
Figure 8-13 Setting VCCI for a Bank