BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 77

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8954
Voice Pair Gain Framer
RSFIFO_O_UNDER
RSFIFO_O_OVER
RSFIFO_I_UNDER
RSFIFO_I_OVER
RFIFO_UNDER
RFIFO_OVER
N8954DSC
Receive Signaling Input FIFO_UNDER Error—Indicates that RSFIFO_O has underflowed.
That is, RSFIFO_O is being read by the MC faster than it is being updated with RSFIFO_I.
Also reported in ISR (as part of SIG_FIFO_ERR) and generates a SIG_FIFO_ERR interrupt
(if SIG_FIFO_ERR in IMR is enabled).
Receive Signaling Input FIFO_OVER Error—Indicates that RSFIFO_O has overflowed. That
is, RSFIFO_O is being updated faster than read by the MC. Also reported in ISR (as part of
SIG_FIFO_ERR) and generates a SIG_FIFO_ERR interrupt (if SIG_FIFO_ERR in IMR is
enabled).
Receive Signaling Input FIFO_UNDER Error—Indicates that RSFIFO_I has underflowed.
That is, RSFIFO_I is being copied into RSFIO_O faster than it is being updated (from receive
DSL frames). Also reported in ISR (as part of SIG_FIFO_ERR) and generates a
SIG_FIFO_ERR interrupt (if SIG_FIFO_ERR in IMR is enabled). RSFIFO_I_UNDER
cannot be permanently cleared. Writing any value to RSFIFO_PTR_RST [0x06] can
temporarily clear this error. On the next RD-RSIG interrupt, RSFIFO_I_UNDER is again set.
Receive Signaling Input FIFO_OVER Error—Indicates that RSFIFO_I has overflowed. That
is, RSFIFO_I is being updated faster (from receive DSL frames) than it is being copied into
RSFIFO_O. Also reported in ISR (as part of SIG_FIFO_ERR) and generates a
SIG_FIFO_ERR interrupt (if SIG_FIFO_ERR in IMR is enabled).
Receive FIFO_UNDER Error—Indicates the RFIFO has underrun. Also reported in ISR and
generates an RX_ERR interrupt (if RX_ERR in IMR is enabled). RFIFO_UNDER is
indicative of clock problems and may be triggered by events similar to those which cause
RFIFO_OVER errors.
Receive FIFO_OVER Error—Indicates the RFIFO has overflowed. Also reported in ISR and
generates an RX_ERR interrupt (if RX_ERR in IMR is enabled). RFIFO_OVER is indicative
of clock problems.
0 = RSFIFO_O normal
1 = RSFIFO_O underflowed
0 = RSFIFO_O normal
1 = RSFIFO_O overflowed
0 = RSFIFO_I normal
1 = RSFIFO_I underflowed
0 = RSFIFO_I normal
1 = RSFIFO_I overflowed
0 = RFIFO normal
1 = RFIFO underrun
0 = RFIFO normal
1 = RFIFO overflowed
Conexant
4.11 Receive/Transmit Status
4.0 Registers
4-25