MIC2569 Datasheet, PDF (13/16 Pages) Micrel Semiconductor – CableCARD™ Power Switch

Micrel, Inc.
Application Information
CableCARD™ Operating Modes
The OpenCable system has a host component (S-Host
or M-Host) and a card component (S-Card or M-Card).
The host / card combination determines which
operational mode is used i.e. S-Mode or M-Mode. This
in turn determines the appropriate state diagram. Table
3 below shows all of the combinations and operating
modes.
S-Host
M-Host
S-Card
S-Mode
S-Mode or No power
M-Card
S-Mode
M-Mode
Table 3 Operating Mode Combinations
An M-Host has the choice to accept or not accept an S-
Card. If the M-Host accepts the S-Card then the M-Host
will initiate a change from M-Mode to S-Mode.
Otherwise, the M-Host will not power-up the S-Card.
S-Host
After power-up, the S-Host remains in state 0 [000]
unless one of two events occurs:
1. CIS Request – The CableCard™ may request
that the Vpp outputs be provided with 5VIN, that
is, enter state 1 [001]. It is the S-Host decision
whether to provide the Vpp outputs with 5VIN.
The S-Host has two possible options.
a. If the S-Host refuses to provide 5VIN,
then the S-Host does not change to
state 1 [001] and will remain in state
0 [000], even upon card removal. See
paragraph 2 below.
b. If the S-Host grants 5VIN, then S-Host
changes to state 1 [001]. The S-Host
remains in state 1 [001] without
returning. See paragraph 2 below.
2. Card removal – Upon card removal, the S-Host
has two possible options:
a. The S-Host changes directly to state
0 [000], regardless of the state at card
was removed.
b. The S-Host has the option to pass
through state 6 [110] to remove any
excessive voltage or charge on the Vpp
outputs. The S-Host then returns to
state 0 [000].
MIC2569
Figure 1 shows S-Mode power state diagram.
Figure 1 S-Host Power State Diagram
M-Host
1. Power-up - Upon power-up, M-Host two options:
a. Move directly the state 2 [010]
b. Pass through state 7 [111] to remove any
excess voltage or charge, then move to
state 2 [010]
2. No Card – M-Host will remain in state 2 [010]
until card insertion.
3. Card Detection – If the M-Host detects that the
inserted card is an M-card, then the M- Host will
change to state 3 [011]. This informs the card
that the host is an M-Host.
4. Card ID – The M-Host uses the card
identification process to determine what type of
card it is and what modes the card can operate
in. There are three options:
a. If the card is an M-Card, then the M-
Host will change to state 4 [100] and
remain in state 4 [100] until card
removal.
b. If the card is an S-Card able to support
CH1, then the M-Host will reset the card
and power-up in S-Mode. The card will
remain in S-Mode until card removal.
c. If the card is not an M-Card, or an S-
Card not able to support Ch1, then
power will not be provided to the card.
The card will remain without power and
not change state until card removal.
September 2007
13
M9999-092507-C
[phone]