STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
The table below summarizes the recommended values for N1 and N2 for
common modes of operation.
PLL Reference, as set by
register bits
PLL Output
Frequency
N1[7:0]
N2[7:0]
PLLREF[1:0]
1.544 MHz
2.048 MHz
2.048 MHz
1.544 MHz
1.544 MHz (T1)
2.048 MHz (E1)
1.544 MHz (T1)
2.048 MHz (E1)
1.544 MHz (T1)
2FH
FFH
FFH
C0H
C0H
2FH
FFH
C0H
FFH
C0H
nominal 1.544 MHz
(derived from gapped
2.048 MHz)1
8 kHz
16 kHz
8 kHz
1.544 MHz (T1)
1.544 MHz (T1)
2.048 MHz (E1)
2.048 MHz (E1)
00H
01H
00H
01H
C0H
C0H
FFH
FFH
16 kHz
1 Nominal 1.544 MHz is derived from a gapped 2.048 MHz when in T1 mode with
the BTIF’s RATE[1:0] bits set to “01”, “10”, or “11” and BTCLK configured as the
reference.
PROPRIETARY AND CONFIDENTIAL
122
PMC [ PMC-SIERRA, INC ]
