4.4 PCI Interface Signals –Table 2
Name
Type
Description
DEVSEL#
I/O
Device Select:
The Ibex Peak asserts DEVSEL# to claim a
PCI transaction. As an output, the Ibex Peak asserts
DEVSEL# when a PCI master peripheral attempts an access
to an internal Ibex Peak address or an address destined for
DMI (main memory or graphics). As an input, DEVSEL#
indicates the response to an Ibex Peak-initiated transaction on
the PCI bus. DEVSEL# is tri-stated from the leading edge of
PLTRST#. DEVSEL# remains tri-stated by the Ibex Peak
until driven by a target device.
FRAME#
I/O
Cycle Frame:
The current initiator drives FRAME# to
indicate the beginning and duration of a PCI transaction.
While the initiator asserts FRAME#, data transfers continue.
When the initiator negates FRAME#, the transaction is in the
final data phase. FRAME# is an input to the Ibex Peak when
the Ibex Peak is the target, and FRAME# is an output from
the Ibex Peak when the Ibex Peak is the initiator. FRAME#
remains tri-stated by the Ibex Peak until driven by an initiator.
