STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
337
Register 0F6H: XLPG Fuse Data Select
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Unused
Unused
Unused
Unused
Unused
Unused
Unused
FDSB
X
X
X
X
X
X
X
0
R/W
When the TUNI bit of the Transmit Line Interface Configuration register is a
logic 1, this register is held reset.
FDSB:
This register selects between microprocessor data (FDSB is logic 1) or the
value burned into the fuses of the transmit line interface unit (FDSB is logic 0)
as the inputs to the XLPG Analog Test Negative Control Register and the
XLPG Analog Test Positive Control Register. To write the fuse data into the
XLPG Analog Test Negative Control Register and the XLPG Analog Test
Positive Control Register, TPC[0] and TNC[0], respectively, must be set to
logic 1 and the XLPG Analog Test Negative Control Register and the XLPG
Analog Test Positive Control Register must each be written to twice
consecutively. (The first write is to activate the outputs of the transmit line
interface unit valid, and the second write copies the fuse data into the
register.) TPC[0] and TNC[0] should be cleared to lower the likelihood of fuse
re-growth.