
XRT86SH328
PRELIMINARY
212
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
`
1 - Enables the Transmit LAPD Controller block.
BIT [7:4] - Unused:
BIT 3 - Transmit LAPD Message Start:
`
A 0 to 1 transition within this bit-field commands the Transmit LAPD Controller block to begin the following activities.
Reading out the contents of the Transmit LAPD Message buffer.
Zero-stuffing of this data
FCS Calculation and Insertion
Fragmentation of this composite PMDL Message, and insertion into the DL bit-fields, within each outbound
DS3 frame.
BIT 2 - Transmit LAPD Controller Busy:
This READ-ONLY bit-field indicates whether or not the Transmit LAPD Controller block is currently busy transmitting a
PMDL Message to the remote terminal equipment. The user can continuously poll this bit-field in order to check for
completion of transmission of the LAPD/PMDL Message.
`
0 - Indicates that the Transmit LAPD Controller block is NOT currently busy transmitting a PMDL message.
`
1 - Indicates that the Transmit LAPD Controller block is currently busy transmitting a PMDL message.
BIT 1 - Transmit LAPD Message Interrupt Enable:
This READ/WRITE bit-field is used to either enable or disable the Transmit LAPD Message Interrupt. If the user enables
this interrupt, then the Transmit DS3 Framer block will generate an interrupt anytime the Transmit LAPD Controller block
has completed its transmission of a given LAPD/PMDL Message to the remote terminal.
`
0 - Disables the Transmit LAPD Message Interrupt.
`
1 - Enables the Transmit LAPD Message Interrupt.
BIT 0 - Transmit LAPD Message Interrupt Status:
This RESET-upon-READ bit-field indicates whether or not the Transmit LAPD Message Interrupt has occurred since
the last read of this register.
`
0 - Indicates that the Transmit LAPD Message Interrupt has NOT occurred since the last read of this register.
`
1 - Indicates that the Transmit LAPD Message Interrupt has occurred since the last read of this register.
Bits 7 - 5 - TxFEBEDat[2:0]
These READ/WRITE bit-fields, along with BIT 4 (FEBE Register Enable) are used to configure the Transmit DS3 Framer
block to transmit the user-specified FEBE values (to the remote terminal equipment) based upon the contents of these
bit-fields.
T
ABLE
283: DS3 F
RAMER
B
LOCK
- T
RANSMIT
DS3 LAPD S
TATUS
/I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
0E34)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Unused
Transmit
LAPD Mes-
sage Start
Transmit
LAPD Con-
troller Busy
Transmit
LAPD Inter-
rupt Enable
Transmit
LAPD Inter-
rupt Status
R/O
R/O
R/O
R/O
R/W
R/O
R/W
RUR
0
0
0
0
0
0
0
0
T
ABLE
284: DS3 F
RAMER
B
LOCK
- T
RANSMIT
DS3 M-B
IT
M
ASK
R
EGISTER
(A
DDRESS
= 0
X
0E35)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxFEBEDat[2:0]
FEBE Regis-
ter Enable
Transmit P-
Bit Error
TxM_Bit_Mask[2:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0