RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 125

• Manufacturer Part Number: RS8953
• Description: High-bit-rate Digital Subscriber Line (hdsl) Channel unit
• Manufacturer: Conexant Systems, Inc.

RS8953B/8953SPB
HDSL Channel Unit
STATE_CNT[2:0]
SYNC_STATE[1:0]
CRC_ERR
CRC_OVR
FEBE_OVR
N8953BDSB
0x06—Receive Status 2 (STATUS_2)
FEBE_OVR
7
CRC_OVR
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.
Receive Framer Synchronization State—Reports the state of the receive framer. Refer to the
Framer Synchronization State Diagram
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.
CRC Error—Shows that the CRC comparison in the previous frame resulted in a mismatch of
1 or more CRC bits. CRC_ERR is invalid in the OUT_OF_SYNC state. The MPU may copy
CRC_ERR into the first transmit IND [TIND_LO; addr 0x02] to report FEBE.
CRC Error Count Overflow—Indicates the CRC Error Count [CRC_CNT; addr 0x21] has
reached its maximum value of 255, and generates an RX_ERR interrupt.
Far-End Block Error Count Overflow—Indicates the FEBE count [FEBE_CNT; addr 0x22]
has reached its maximum value of 255. Generates an RX_ERR interrupt.
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; addr 0xCD] is
When the framer reports SYNC_ERRORED, STATE_CNT indicates the number of
6
CRC_ERR
5
0 = CRC pass
1 = CRC error detected
0 = CRC error count below maximum
1 = CRC error count equals maximum 255 (0xFF)
0 = FEBE count below maximum
1 = FEBE count equals maximum 255 (0xFF)
4
SYNC_STATE[1:0]
000
001
010
011
100
101
110
111
00
01
10
11
Conexant
(Figure
3
3-23).
2 Consecutive Frames
3 Consecutive Frames
4 Consecutive Frames
5 Consecutive Frames
6 Consecutive Frames
7 Consecutive Frames
8 Consecutive Frames
2
SYNC_ACQUIRED
SYNC_ERRORED
OUT_OF_SYNC
1 Frame
IN_SYNC
STATE_CNT[2:0]
4.13 Receive/Transmit Status
1
4.0 Registers
0
4-57