RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 101

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

RS8953B/8953SPB
HDSL Channel Unit
STF_THRESH_A[8:0]
STF_THRESH_B[8:0]
N8953BDSB
0xCF—Bit Stuffing Threshold A (STF_THRESH_A_LO)
0xD0—Bit Stuffing Threshold A (STF_THRESH_A_HI)
0xD1—Bit Stuffing Threshold B (STF_THRESH_B_LO)
0xD2—Bit Stuffing Threshold B (STF_THRESH_B_HI)
0xD3—Bit Stuffing Threshold C (STF_THRESH_C_LO)
—
—
7
7
7
7
7
If the phase measured from PCM to HDSL 6 ms frames is a positive value greater than or
equal to STF_THRESH_A, then 4 STUFF bits are inserted in the outgoing HDSL frame. If the
phase is a positive value less then STF_THRESH_A, then STUFF bits are not inserted in the
outgoing HDSL frame. If the phase is a negative value, then the phase tolerance on HDSL,
PCM, or GCLK inputs is exceeded and the STUFF generator reports STUFF_ERR
[STATUS_3; addr 0x07].
times.
Bit Stuffing Threshold A—Contains the number of GCLK cycles equaling 8 HDSL bit times.
Bit Stuffing Threshold B—Contains the number of GCLK cycles equaling 12 HDSL bit
—
—
6
6
6
6
6
where: n = 8 for STF_THRESH_A
—
—
5
5
5
5
5
n = 12 for STF_THRESH_B
n = 24 for STF_THRESH_C
STF_THRESH_A[7:0]
STF_THRESH_B[7:0]
STF_THRESH_C[7:0]
—
—
4
4
4
4
4
Conexant
—
—
3
3
3
3
3
—
—
2
2
2
2
2
4.8 Transmit Bit Stuffing Thresholds
STF_THRESH_A[9:8]
STF_THRESH_B[9:8]
1
1
1
1
1
4.0 Registers
0
0
0
0
0
4-33