参数资料
型号: PM4314
厂商: PMC-SIERRA INC
元件分类: 数字传输电路
英文描述: QUAD T1/E1 LINE INTERFACE DEVICE
中文描述: DATACOM, PCM TRANSCEIVER, PQFP128
封装: 14 X 20 MM, PLASTIC, QFP-128
文件页数: 127/170页
文件大小: 823K
代理商: PM4314
PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
115
12
OPERATIONS
12.1 Programming the XPLS Waveform Template
The internal XPLS CODE registers, at registers 02FH, 06FH, 0AFH, 0EFH, are
used to create a custom waveform across the analog transmit outputs, TXTIP[X]
and TXRING[X]. These eight CODE registers are accessed indirectly through
register 2EH, 06EH, 0AEH, 0EEH and contain 4-bit binary values corresponding
to one of 16 quantized levels for the amplitude of the output pulse during each of
eight synchronous, "high-speed" clock periods within a data clock cycle. The full
swing of the amplifier outputs TXTIP[X] and TXRING[X] ranges from 0 to 4.02
Volts. The codes select the nominal voltage levels into 50
as follows:
Table 10
-
CODE
Typical
Output
0.05 V
0.31 V
CODE
Typical Output
Voltage
2.16 V
0000
1000
0001
1001
2.43 V
0010
0.58 V
1010
2.70 V
0011
0.85 V
1011
2.97 V
0100
1.16 V
1100
3.23 V
0101
1.38 V
1101
3.49 V
0110
1.65 V
1110
3.76 V
0111
1.91 V
1111
4.02 V
The contents of the CODE registers are used by XPLS and internally applied to
the output D/A converter in sequence, beginning with CODE reg. #0, on the first
falling edge of the internal, synchronous high-speed clock once the data clock
has gone low. The first four codes determine the shape of the bulk of the pulse,
whereas the last four codes determine the shape of the tail end of the pulse.
Depending on the polarity of the input pulse (either on the positive pulse input or
the negative pulse input to XPLS), the bulk of the pulse is generated on either
TXTIP[X] or TXRING[X], with the tail generated on TXTIP[X] or TXRING[X],
respectively. The pulse is produced differentially across the transformer primary
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