PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
Register 069H, 0E9H, 169H, 1E9H, 269H, 2E9H, 369H, 3E9H: XLPG Pulse Waveform Scale
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Unused
Unused
X
X
X
0
0
0
0
0
Unused
R/W
R/W
R/W
R/W
R/W
SCALE[4]
SCALE[3]
SCALE[2]
SCALE[1]
SCALE[0]
SCALE[4:0]:
The SCALE[4:0] bits specify a scaling factor to be applied to the amplitude of the D/A output
waveform. Each of the 12 waveforms stored in the XLPG’s pulse template RAM may have a
different scaling factor. When a particular waveform is selected for use (by the PT_SEL[3:0]
register bits or LENx[2:0] inputs), the scaling factor corresponding to that waveform is chosen
automatically.
When this register is written to, the value of SCALE[4:0] is stored in one of 12 storage
locations indexed by the WAVEFORM[3:0] bits of the Pulse Waveform Storage Write Address
#2 register. Thus to set up scaling factors for more than one waveform, this register should
be written to a number of times, with WAVEFORM[3:0] set to the different waveform numbers,
as appropriate.
The SCALE[4:0] bits scale the maximum output amplitude by increments of 11.14 mA. A
value of 0 (00H) tristates the output while the maximum value of 21 (15H) sets the full scale
current to 234 mA.
Table 14 – Transmit Output Amplitude
SCALE[4:0]
Decimal
Equiv.
Output Amplitude
00000
00001-10100
10101
0
0 mA (tristate)
Increments of 11.14 mA for each scale step
234 mA total
1-20
21
10110-11111
>21
Reserved
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
148
PMC [ PMC-SIERRA, INC ]
