BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 78

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

4.0 Registers
4.11 Receive/Transmit Status
FEBE_OVR
CRC_OVR
CRC_ERR
SYNC_STATE[1:0]
STATE_CNT[2:0]
4-26
0xE6—Receive Status 2 (RSTATUS_2)
FEBE_OVR
7
CRC_OVR
Far End Block Error Count Overflow—Indicates the FEBE count [FEBE_CNT; 0x69] has
reached its maximum value of 255. Generates an RX_ERR interrupt.
CRC Error Count Overflow—Indicates the CRC error count [CRC_CNT; 0xE8] has reached
its maximum value of 255, and generates an RX_ERR interrupt.
CRC Error—Shows that the CRC comparison in the previous frame resulted in a mismatch of
one or more CRC bits. CRC_ERR is invalid in the OUT_OF_SYNC state. The MPU can copy
CRC_ERR into the first transmit IND [TIND_LO; 0x82] to report FEBE.
Receive Framer Synchronization State—Reports the state of the receive framer. Refer to
Figure 3-4 on page 3-6.
CRC error counts are suspended, and RX_ERR is activated.
enabled, and RX_ERR is activated.
re-established, FEBE and CRC counting resumes, and RX_ERR is activated.
consecutive frames in which SYNC was not detected.
Intermediate State Count—Applicable only if SYNC_STATE reports SYNC_ACQUIRED or
SYNC_ERRORED states. STATE_CNT indicates the framer’s progress through the
intermediate states.
When the framer enters OUT_OF_SYNC, the RFIFO is automatically reset, FEBE and
When the framer reports SYNC_ACQUIRED, the RFIFO and the payload mapper are
When the framer enters IN_SYNC, the RFIFO water level [RFIFO_WL; 0xA2, 0xA3] is
When the framer reports SYNC_ERRORED, STATE_CNT indicates the number of
6
CRC_ERR
5
0 = FEBE count below maximum
1 = FEBE count equals maximum 255 (0xFF)
0 = CRC error count below maximum
1 = CRC error count equals maximum 255 (0xFF)
0 = CRC pass
1 = CRC error detected
000
001
010
011
100
101
110
111
00
01
10
11
4
SYNC_STATE[1:0]
Conexant
OUT_OF_SYNC
SYNC_ACQUIRED
IN_SYNC
SYNC_ERRORED
1 frame
2 consecutive frames
3 consecutive frames
4 consecutive frames
5 consecutive frames
6 consecutive frames
7 consecutive frames
8 consecutive frames
3
2
STATE_CNT[2:0]
Voice Pair Gain Framer
1
N8954DSC
Bt8954
0