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The
pin is active in every data cycle of a flyby transaction. For read
FLYBY
transactions, the
data on the data bus and to increment its internal state machines or
FIFOs, if necessary. In write transactions, this is slightly more compli-
cated. The
FLYBY
machines or FIFOs if necessary. It cannot, however, be used for driving
data by the I/O because there may be a long delay path from the Tiger-
SHARC processor to the I/O output buffers and from the I/O device to
memory—all in one cycle. The I/O output buffers are enabled by the
pin. The
IOEN
after any other device ceases driving the data bus. An example of flyby
transactions, in this case a data write to the SDRAM, is shown in
Figure 5-18 on page 5-36. The
,
,
, and
da0
da1
db0
to change the data. The data drive, however, is indicated by asserting the
.
IOEN
The sequence illustrated in Figure 5-18 applies when:
• Transfer is followed by another burst write transfer from I/O to the
SDRAM device
• Flyby transaction and bus width = 64
ADSP-TS101 TigerSHARC Processor
Hardware Reference
pin is an indication to the I/O device to strobe the
FLYBY
pin can be used to increment the I/O internal state
is active at least one cycle before the data cycle, but only
FLYBY
. The
db1
FLYBY
pin is asserted on the data cycles
pin is the indication to the I/O device
Cluster Bus
IOEN
5-35
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