XRT75R12 Datasheet, PDF (62/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

XRT75R12
REV. P1.0.2
PRELIMINARY
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
THE GLOBAL/CHIP-LEVEL REGISTERS
The register set, within the XRT75R12 contains ten global or chip-level registers. These registers control
operations in more than one channel or apply to the complete chip. This section will present detailed
information on the Global Registers.
ADDRESS
0x00
0x08
0x80
0x88
0x60
0x61
0xE0
0xE1
0x6E
0x6F
TABLE 17: LIST AND ADDRESS LOCATIONS OF GLOBAL REGISTERS
COMMAND
REGISTER
LABEL
TYPE
REGISTER NAME
CR0
APST R/W APS Transmit Redundancy Control Register 0-5
CR8
APSR R/W APS Receive Redundancy Control Register 0-5
CR128
APST R/W APS Transmit Redundancy Control Register 6-11
CR136
APSR R/W APS Receive Redundancy Control Register 6-11
CR96
CIE
R/W Channel 0-5 Interrupt Enable flags
CR97
CIS
R/O Channel 0-5 Interrupt status flags
CR224
CIE
R/W Channel 6-11 Interrupt enable flags
CR225
CIS
R/O Channel 6-11 Interrupt status flags
CR110
PN
ROM Device Part Number Register
CR111
VN
ROM Chip Revision/Version Number Register
REGISTER DESCRIPTION - GLOBAL REGISTERS
TABLE 18: APS/REDUNDANCY TRANSMIT CONTROL REGISTER - CR0 (ADDRESS LOCATION = 0X00)
BIT 7
Reserved
BIT 6
Reserved
BIT 5
TxON Ch 5
BIT 4
TxON Ch 4
BIT 3
TxON Ch 3
BIT 2
TxON Ch 2
BIT 1
TxON Ch 1
BIT 0
TxON Ch 0
R/W
R/W
R/W
R/W
R/W
R/W
BIT
NUMBER
NAME
7,6
Reserved
5
TxON Ch 5
4
TxON Ch 4
3
TxON Ch 3
2
TxON Ch 2
1
TxON Ch 1
0
TxON Ch 0
TYPE
DESCRIPTION
R/W Transmit Section ON - Channel n
This READ/WRITE bit-field is used to turn on or turn off the Transmit
Driver associated with Channel n. If the user turns on the Transmit
Driver, then Channel n will transmit DS3, E3 or STS-1 pulses on the
line via the TTIP_n and TRING_ n output pins.
Conversely, if the user turns off the Transmit Driver, then the TTIP_n
and TRING_n output pins will be tri-stated.
0 - Shuts off the Transmit Driver associated with Channel n and tri-
states the TTIP_n and TRING_ n output pins.
1 - Turns on the Transmit Driver associated with Channel n.
NOTE: The master TxON control pin(pin # P4) must be in a high
state (logic 1) for this operation to turn on any channel.
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