Agilent Technologies HDMP-3001 - Manual (Page 76)

76
ADDR=0x174: Receive Path Delta
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name Reserved Reserved Reserved RX_C2_D RX_G1_D RX_UNEQ_ RX_PLM_D Reserved
D
R/W — — — W1C W1C W1C W1C —
Value 0 0 0 0 0 0 0 —
after
reset
Bits 7-5: Reserved
Bit 4: RX_C2_D: RX_C2 delta bit. It is set when a new value is stored in RX_G1 [2:0].
Bit 3: RX_G1_D: RX_G1 delta bit. It is set when RX_UNEQ changes state.
Bit 2: RX_UNEQ_D: RX_UNEQ delta bit. It is set when RX_PLM changes state.
Bit 1: RX_PLM_D: RX_PLM delta bit. It is set when a new value is stored in RX_C2 [7:0]
Bit 0: Reserved
Write one to these bits to clear them.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name EXP_C2 [7:0]
R/W R/W
Value 0 0 0 1 1 0 0 0
after
reset
ADDR=0x176: Expected C2 Byte
Bits 7-0: EXP_C2 [7:0]
The received C2 bytes are monitored so that reception of the correct type of payload can be verified. When
a consistent C2 value is received for five consecutive frames, it is written to RX_C2 [7:0], and the RX_C2_D
delta bit is set. The expected value of the received C2 bytes is provided in EXP_C2 [7:0]. Its value after
reset is 0x18 which indicates the mapping of a LAPS framed signal. If the received value does not match the
expected value, and it is NOT:
• all zeros unequipped label
• 0x01 equipped, non-specific label
• 0xFC payload defect label
• 0xFF reserved label
then the Payload Label Mismatch register bit, RX_PLM, is set to one.
If the current accepted value is the all zeros unequipped label, and EXP_C2[7:0]
≠
0, then the
unequipped register bit, RX_UNEQ, is set to one.