BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 74

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

4.0 Registers
4.11 Receive/Transmit Status
4.11 Receive/Transmit Status
The MC can read all Receive and Transmit Status registers non-destructively at any time. All status registers are
updated coincident with the DSL channel’s receive or transmit 6 ms frame interrupts indicated in the Interrupt
Status Register [ISR; 0xD0]. Therefore, the MC can poll the ISR or enable interrupts to determine if a status
update has occurred. Real-time receive status (REOC, RIND, and RSBIT) register updates are suspended when
the receive framer reports an OUT_OF_SYNC state [RSTATUS_2; 0xE6]. The Receive and Transmit Status
Read registers are listed in Table 4-9.
Table 4-9. Receive and Transmit Status Read Registers
Receive EOC holds 13 EOC bits received during the previous DSL frame. Refer to Table 3-1 on page 3-3 for
EOC bit positions within the frame. The most significant bit, REOC[12] is received first.
REOC_LO (Address 0xE0)
Receive IND holds 13 IND bits received during the previous DSL frame. Refer to Table 3-1 on page 3-3 for the
IND bit positions within the frame. The receive framer updates the RIND registers on receive frame interrupt
boundaries. The most significant bit RIND[12] is received first.
4-22
0xE0, 0xE1—Receive Embedded Operations Channel (REOC_LO, REOC_HI)
0xE2, 0xE3—Receive Indicator Bits (RIND_LO, RIND_HI)
REOC_HI (Address 0xE1)
Address
0xE0
0xE1
0xE2
0xE3
0xE4
0xE5
0xE6
0xE7
0xE8
0xE9
15
—
7
RSFIFO_I, RSFIFO_O
Register Label
14
—
RSTATUS_1
RSTATUS_2
TSTATUS_1
6
FEBE_CNT
REOC_LO
CRC_CNT
RIND_LO
REOC_HI
RIND_HI
13
—
5
48 x 8, 48 x 8
Bits
8
5
8
5
8
8
8
8
8
12
4
Conexant
REOC[7:0]
11
3
Far End Block Error Count
REOC[12:8]
Receive Signaling FIFOs
Register Description
Receive EOC Bits
Receive EOC Bits
CRC Error Count
Receive IND Bits
Receive IND Bits
Receive Status 1
Receive Status 2
10
Transmit Status
2
Voice Pair Gain Framer
1
9
N8954DSC
Bt8954
0
8