XRT79L71_1 Datasheet, PDF (341/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

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XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
Transmit ATM Cell Processor Block - Transmit ATM Control Register - Byte 1 (Address = 0x1F02)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Test Cell ONE SHOT
Transmit
MODE
Mode Enable
GFC
Insertion
Enable - Bit
3 (MSB)
GFC
Insertion
Enable - Bit
2
GFC
Insertion
Enable - Bit
1
GFC
Insertion
Enable - Bit
0 (LSB)
COSET
Polynomial
Addition
Regenerate
HEC Byte
Enable
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
BIT NUMBER
NAME
7
Test Cell Transmit Mode
Enable
6
One Shot Mode
TYPE
R/W
R/W
DESCRIPTION
Test Cell Transmit Mode Enable:
This READ/WRITE bit-field permits the user to enable the Test
Cell Transmitter (within the Transmit ATM Cell Processor Block).
The user must implement this configuration option in order to
perform diagnostic operations with Test Cells.
0 - Disables the Test Cell Transmitter.
1 - Enables the Test Cell Transmitter.
NOTE: For normal operation, the user should set this bit-field to
"1".
One Shot Mode:
If the user has enabled the Test Cell Transmitter, then this
READ/WRITE bit-field permits the user to either configure the
Test Cell Transmitter into the One-Shot or in the Continuous
Mode.
If the user configures the Test Cell Transmitter into the One-Shot
Mode, then (whenever the user implements a "0" to "1" transition
within Bit 7 [Test Cell Transmit Mode Enable] of this register)
then the Test Cell Transmitter will generate and transmit 1024
test cells. Afterwards, the Test Cell Transmitter will halt its trans-
mission of Test Cells until the user implements another "0" to "1"
transition within Bit 7 (Test Cell Transmit Mode Enable) within
this register.
If the user configures the Test Cell Transmitter into the Continu-
ous Mode, then the Test Cell Transmitter will continuously gener-
ate and transmit test cells for the duration that Bit 7(Test Cell
Transmit Mode Enable) is set to "1".
0 - Configures the Test Cell Transmitter to operate in the Contin-
uous Mode.
1 - Configures the Test Cell Transmitter to operate in the One-
Shot Mode.
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