
PRELIMINARY
XRT79L71
130
REV. P2.0.0
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
STEP 7b - Enable the Transmit DS3/E3 Framer block Interrupts - At the Block Level.
This step is accomplished by setting Bit 1 (Transmit DS3/E3 Framer Block Interrupt Enable), within the Block
Interrupt Enable Register, to "1", as illustrated below.
STEP 7c - Enable the Transmit LAPD Interrupt at the Source Level.
This step is accomplished by setting Bit 1 (Transmit LAPD Interrupt Enable), within the Transmit DS3 LAPD
Status/Interrupt Register to "1", as illustrated below.
STEP 8 - Command the Transmit LAPD Controller to begin its transmission.
At this point, it is finally time to command the Transmit LAPD Controller to do its job and transmit the loaded
PMDL Message to the remote terminal equipment.
The user accomplishes this by inducing a "0" to "1"
transition, within Bit 3 (Initiate Transmission of LAPD/PMDL Message) in the Transmit DS3 LAPD Status/
Interrupt Register, as depicted below.
Operation Block Interrupt Enable Register - Byte 1 (Address = 0x0116)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
DS3/E3 LIU/JA Block
Interrupt Enable
DS3/E3 Framer Block
Interrupt Enable
Unused
R/O
R/W
R/O
0
1
0
Block Interrupt Enable Register (Address = 0x1104)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Receive DS3/E3
Framer Block
Interrupt Enable
Receive PLCP
Processor Block
Interrupt Enable
Unused
Transmit DS3/
E3 Framer Block
Interrupt Enable
One Second
Interrupt Enable
R/W
R/O
R/W
X
0
1
X
Transmit DS3 LAPD Status/Interrupt Register (Address = 0x1134)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
Initiate
Transmission
of LAPD/
PMDL Mes-
sage
Transmit LAPD
Controller Busy
Transmit LAPD
Interrupt
Enable
Transmit LAPD
Interrupt Status
RO
R/W
RO
R/W
RUR
0
1
0