CDP1020 Ver la hoja de datos (PDF) - Intersil
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CDP1020 Datasheet PDF : 23 Pages
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NOTE: THERE IS NO
LED SOLID AMBER STATE.
CDP1020
BAY EMPTY
LED:
OFF
LED:
OFF
REMOVAL
ALLOWED
%001 ->
BAY_STREQ
%100 -> BAY_STREQ
DEVICE
INSERTED
LED:
FLASH
GREEN
BA%Y_0S1T0R->EQ
LED:
FLASH
AMBER
REMOVAL
REQUESTED
=1
REMREQ
%011 ->
BAY_STREQ
%010 -> BAY_STREQ
REMREQ = 1
%011 -> BAY_STREQ
DEVICE
ENABLED
LED:
SOLID
GREEN
FIGURE 9. CDP1020 BAY STATE DIAGRAM
The first events listed above is known as an insertion
interrupt event. On an insertion interrupt event, the bay state
machine is transitioned to the Device Inserted state, the bay
status LED is set to flash green, and the ALRT output is
asserted to notify the OS of the device insertion.
The second and third events are removal interrupt events. If
the DEVSTSCHG_EN flag is set, the CDP1020 will assert its
ALRT output to notify the OS of the device removal.
Regardless of the state of the DEVSTSCHG_EN bit, the
CDP1020 will always transition the bay state to Bay Empty,
clear the PWREN flag, turn of the PWREN output, and clear
the bay state request field of the associated BCER.
The last event is a remove request event. When a user
presses the REMREQ button on a bay with a device
inserted, the CDP1020 will set the REMREQ_STS flag for
that bay. If the REMREQ_EN bit is set, the CDP1020 will
assert its ALRT output to notify the OS.
Figure 4 shows the output logic for the ALRT pin. As shown
in this diagram, an interrupt event can be generated by
setting an enable flag after the status bit has been set by
some hardware event. For example, the REMREQ_EN flag
is clear and a user presses the REMREQ button. The
CDP1020 will set the REMREQ_STS flag, but will not
generate an interrupt event. Now, the OS sets the
REMREQ_EN flag. As soon as this occurs, the CDP1020
will assert its ALRT output and generate a REMREQ
interrupt event.
Insertion Time Out
When a device is inserted into a bay, it will make electrical
contact with device bay connector very quickly. However, in
most systems there will need to a delay while the user
releases the device and it settles into the bay itself.
The insertion time out function of the CDP1020 allows a system
designer to specify a delay time that the CDP1020 will wait
before notifying the OS that a device has been inserted. This
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