CYP15G0401DXB Cypress Semiconductor Corporation., CYP15G0401DXB Datasheet - Page 29

• Manufacturer Part Number: CYP15G0401DXB
• Description: Quad Hotlink Ii Transceiver
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-02002 Rev. *L
Receive Synchronization State Machine when Channel
Bonding is enabled
Each receive channel contains a Receive Synchronization
State Machine that is enabled whenever the receive channels
are configured for channel bonding (RXMODE[1] ≠ LOW). This
machine handles loss and recovery of bit, channel, and word
framing, and part of the control for channel bonding. Separate
forms of the state machine exist for the two different types of
status reporting. When operated without channel bonding
(RXMODE[1] = LOW, RX Modes 0 and 2), these state
machines are disabled and characters are decoded directly as
shown in Table 23.
Table 20. Receive Character Status Bits when Channel Bonding is enabled
RXSTx
[2:0]
000
001
010
100
101
011
110
111
Priority
7
7
2
5
4
1
6
3
Normal Character Received. The valid Data character on the output bus meets all the formatting require-
ments of Data characters listed in Table 28.
Special Code Detected. The valid special character on the output bus meets all the formatting requirements
of the Special Code characters listed in Table 29, but is not the presently selected framing character or a
decoder violation indication.
Receive Elasticity Buffer Underrun/Overrun Error.
The receive buffer was not able to add/drop a K28.5 or
framing character.
Framing Character Detected. This indicates that a character matching the patterns identified as a framing
character (as selected by FRAMCHAR) was detected. The decoded value of this character is present to the
associated output bus.
Codeword Violation. The character on the output bus is a C0.7. This indicates that the received character
cannot be decoded into any valid character.
Loss of Sync. The character on the bus is invalid, due
to an event that has caused the receive channels to
lose synchronization. When channel bonding is
enabled, this indicates that one or more channels have
either lost bit synchronization (loss of character
framing), or that the bonded channels are no longer in
proper character alignment. When the channels are
operated independently (with the decoder enabled),
this indicates a PLL Out of Lock condition.
Running Disparity Error. The character on the output bus is a C4.7, C1.7, or C2.7.
Resync. The receiver state machine is in the Resynchronization state. In this state the data on the output bus
reflects the presently decoded FRAMCHAR.
RX Status A
Status Type-A Receive State Machine
This machine has four primary states: NO_SYNC, RESYNC,
COULD_NOT_BOND, and IN_SYNC, as shown in Figure 2.
The IN_SYNC state can respond with multiple status types,
while others can respond with only one type.
Status Type-B Receive State Machine
This machine has four primary states: NO_SYNC, RESYNC,
IN_SYNC, and COULD_NOT_BOND, as shown in Figure 3.
Some of these states can respond with only one status value,
while others can respond with multiple status types.
Description
Channel Lock Detected. Asserts when the bonded
channels have detected RESYNC within the allotted
window. Presented only on the last cycle before
aligned data is presented.
Loss of Sync. The character on the bus is invalid, due
to an event that has caused the receive channels to
lose synchronization. When channel bonding is
enabled, this indicates that one or more channels have
either lost bit synchronization (loss of character
framing), or that the bonded channels are no longer in
proper character alignment. When the channels are
operated independently (with the decoder enabled),
this indicates a PLL Out of Lock condition. Also used
to indicate Receive Elasticity Buffer underflow/
overflow errors.
RX Status B
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