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Fast CS Access
Normally, FlexROM III drives its SRAM CS (chip select) lines with a buffered version of your target’s CS
line and provides stable data 45ns after the last transition on address or after CS goes active – whichever is
later.
Enabling FAST CS ACCESS causes FlexROM III to force its SRAM CS lines always active. FlexROM
III’s output buffers are still gated with your target CS so the emulator continues to honor all target control
signals. This reduces the emulator’s Tcs access time from 45ns to 12ns.
Many targets will decode their CS signal off of address lines. This makes the Tcs the determining factor in
setting its ACCESS time requirements. The Tacc might be 45ns but due to decoding delays, the Tcs could
be 30 – 40ns. In this situation, the FAST CS option would allow our 45ns emulator to function properly in
a target that normally requires a 30-40ns emulator.
You normally would not turn this option on unless your target has a Tcs requirement of < 45ns and its
addresses are stable before CS is activated.
Turning on this option will result in higher operating current requirements and could increase system noise
in targets that have extended periods of address line float.
Fast OE Access
Normally, FlexROM III drives its SRAM OE (output enable) lines with a buffered version of your target’s
OE line and provides stable data 45ns after the last transition on address or after CS goes active, or 30ns
after OE goes active – whichever is later.
Enabling FAST OE ACCESS causes FlexROM III to force its SRAM OE lines always active. FlexROM
III’s output buffers are still gated with your target OE so the emulator continues to honor all target control
signals. This reduces the emulator’s OE access time from 30ns to 12ns.
Turning on this option will result in slightly higher operating current requirements and could increase
system noise in some targets during target writes to the emulator.
You normally would not turn on this option unless your target has a Toe timing specification of < 30ns.
However, it generally does not hurt to do so.
It is acceptable to use FAST CS and FAST OE at the same time.
FlexROM III User’s Manual
22
Copyright ? 2001, TechTools
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