cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 163

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
UP_LEN[1:0]
Unused bits are reserved and should be written to 0.
LBA[1]
LBA[2]
LBA[3]
LBA[4]
LBA[5]
LBA[6]
LBA[7]
Unused bits are reserved and should be written to 0.
LBD[1]
LBD[2]
LBD[3]
LBD[4]
LBD[5]
LBD[6]
LBD[7]
100054E
043—Loopback Activate Code Pattern (LBA)
044—Loopback Deactivate Code Pattern (LBD)
LBD[1]
LBA[1]
7
7
Loopback Activate Code Length—Selects the number of loopback pattern bits from LBA
[addr 043] that are compared to received data. This is done in order to determine whether a
Loopback Activate Code [LOOPUP; addr 048] has been detected. LOOPUP is recovered if the
received data pattern contains fewer than 63 bit errors in a 24 ms period, or lost if 64 or more
bit errors are detected in a subsequent 24 ms period. F-bits that overwrite or are inserted into
the loopback pattern are not counted as bit errors. Accurate code detection is provided on lines
with up to 1E-3 BER.
First bit expected of LOOPUP pattern
Second bit expected of LOOPUP pattern
Third bit expected of LOOPUP pattern
Fourth bit expected—Last bit if UP_LEN selects a 4-bit pattern
Fifth bit expected—Last bit if UP_LEN selects a 5-bit pattern
Sixth bit expected—Last bit if UP_LEN selects a 6-bit pattern
Seventh bit expected—Last bit if UP_LEN selects a 7-bit pattern
First bit expected of LOOPDN pattern
Second bit expected of LOOPDN pattern
Third bit expected of LOOPDN pattern
Fourth bit expected—Last bit if DN_LEN selects a 4-bit pattern
Fifth bit expected—Last bit if DN_LEN selects a 5-bit pattern
Sixth bit expected—Last bit if DN_LEN selects a 6-bit pattern
Seventh bit expected—Last bit if DN_LEN selects a 7-bit pattern
LBA[2]
LBD[2]
6
6
UP_LEN
00
01
10
11
LBA[3]
LBD[3]
5
5
LBA Length
4 bits
5 bits
6 bits
7 bits
LBD[4]
LBA[4]
4
4
Conexant
LBA[5]
LBD[5]
3
3
LBA[6]
LBD[6]
2
2
LBD[7]
LBA[7]
1
1
3.9 Receiver Registers
3.0 Registers
—
—
0
0
3-41