XRT73L04B
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
IV
C
OMMAND
R
EGISTER
CR4-(
N
) ............................................................................................................ 48
Figure 34.The Digital Local Loop-Back path within a given channel .............................................................. 48
C
OMMAND
R
EGISTER
CR4-(
N
) ............................................................................................................ 48
4.3 T
HE
R
EMOTE
L
OOP
-B
ACK
M
ODE
................................................................................................... 49
Figure 35.The Remote Loop-Back path, within a given channel .................................................................... 49
C
OMMAND
R
EGISTER
CR4-(
n
) ............................................................................................................ 49
4.4 T
X
OFF F
EATURES
......................................................................................................................... 50
C
OMMAND
R
EGISTER
CR1-(
N
) ............................................................................................................ 50
Table 6:The Relationship Between the TxOFF Input Pin, the TxOFF Bit Field and the State of the Transmitter
50
4.5 T
HE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
.................................................................................... 50
Figure 36.The XRT73L04B employing the Transmit Drive Monitor Features ................................................. 51
4.6 T
HE
TAOS (T
RANSMIT
A
LL
O
NE
S) F
EATURE
................................................................................. 51
5.0 THE MICROPROCESSOR SERIAL INTERFACE ................................................................................... 51
5.1 D
ESCRIPTION
OF
THE
C
OMMAND
R
EGISTERS
.................................................................................. 51
C
OMMAND
R
EGISTER
CR1-(
N
) ............................................................................................................ 51
Table 7:Hexadecimal Addresses and Bit Formats of XRT73L04B Command Registers ............................... 52
5.2 D
ESCRIPTION
OF
B
IT
-F
IELDS
FOR
EACH
C
OMMAND
R
EGISTER
......................................................... 53
Command Register - CR0-(n) ............................................................................................................ 53
C
OMMAND
R
EGISTER
CR
0-(
N
) ............................................................................................................. 53
C
OMMAND
R
EGISTER
CR1-(
N
) ............................................................................................................ 54
Command Register CR2-(n) .............................................................................................................. 54
C
OMMAND
R
EGISTER
CR2-(
N
) ............................................................................................................ 54
C
OMMAND
R
EGISTER
CR3-(
N
) ............................................................................................................ 55
C
OMMAND
R
EGISTER
CR4-(
N
) ............................................................................................................ 56
Table 8:Contents of LLB_(n) and RLB_(n) and the Corresponding Loop-Back Mode for Channel(n) ........... 56
5.3 O
PERATING
THE
M
ICROPROCESSOR
S
ERIAL
I
NTERFACE
. ................................................................. 56
Figure 37.Microprocessor Serial Interface Data Structure ............................................................................. 57
Figure 38.Timing Diagram for the Microprocessor Serial Interface ................................................................ 58
O
RDERING
INFORMATION
..................................................................................................... 59
P
ACKAGE
D
IMENSIONS
........................................................................................................ 59
R
EVISION
H
ISTORY
..................................................................................................................................... 60