XRT73L04A Datasheet, PDF (31/65 Pages) Exar Corporation – 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

XRT73L04A
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 2.0.3
TABLE 2: HEXADECIMAL ADDRESSES AND BIT FORMATS OF XRT73L04A COMMAND REGISTERS
REGISTER BIT-FORMAT
ADDRESS
COMMAND
REGISTER
TYPE
D4
D3
D2
D1
D0
CHANNEL3
0x18
CR0-3
RO
RLOL_3
RLOS_3
ALOS_3
DLOS_3
DMO_3
0x19
CR1-3
R/W
TxOFF_3
TAOS_3
TxClkINV_3 TxLEV_3 Reserved
0x1A
CR2-3
R/W
Reserved
Reserved ALOSDIS_3 DLOSDIS_3 REQEN_3
0x1B
CR3-3
R/W
(SR/DR)_3 LOSMUT_3
RxOFF RxClk_3INV Reserved
0x1C
CR4-3
R/W
Reserved STS-1/DS3_3
E3_3
LLB_3
RLB_3
0x1D
CR5-3
R/W
Reserved
Reserved
Reserved Reserved Reserved
0x1E
CR6-3
R/W
Reserved
Reserved
Reserved Reserved Reserved
0x1F
CR7-3
R/W
Reserved
Reserved
Reserved Reserved Reserved
Address:
The register addresses are presented in the Hexa-
decimal format.
Type:
The Command Registers are either Read-Only (RO)
type of registers or Read/Write (R/W) type of regis-
ters.
The default value for each of the bit-fields within these reg-
isters is "0".
a. Operating in the Hardware Mode.
In order to configure individual Channels into the ap-
propriate mode, set the E3_(n), and the STS-1/
DS3_(n) input pins (where n = 0, 1, 2, or 3) to the ap-
propriate logic states, as presented below inTable 3.
TABLE 3: SELECTING THE DATA RATE FOR CHANNEL(n) VIA THE E3_(n) AND STS-1/DS3_(n) INPUT PINS
(HARDWARE MODE)
DATA RATE
E3 (34.368 Mbps)
DS3 (44.736 Mbps)
STS-1 (51.84 Mbps)
STATE OF E3_(n) PIN
1
0
0
STATE OF STS-1/DS3_(n) PIN
MODE OF B3ZS/HDB3 ENCODER/
DECODER BLOCKS
X (Don’t Care)
HDB3
0
B3ZS
1
B3ZS
b. Operating in the HOST Mode.
To configure a Channel into the appropriate mode,
write the appropriate values into the STS-1/DS3_(n)
and E3_(n) bit-fields within the Command Register
CR4-(n), as illustrated below (refer to Table 2 for the
correct address for each channel).
COMMAND REGISTER, CR4-(n)
D4
D3
D2
D1
D0
X STS-1/(DS3)_(n)) E3_(n) LLB_(n) RLB_(n)
x
x
x
x
x
Table 4 relates the values of these two bit-fields to the
selected data rates.
TABLE 4: SELECTING THE DATA RATE FOR CHANNEL(n)
VIA THE STS-1/DS3_(n) AND THE E3_(n) BIT-FIELDS
WITHIN THE APPROPRIATE COMMAND REGISTER (HOST
MODE)
SELECTED DATA STS-1/DS3_(n)
RATE
(D3)
E3_(n)
(D2)
E3
X (Don’t Care)
1
DS3
0
0
STS-1
1
0
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