DS3104GN Maxim Integrated Products, DS3104GN Datasheet - Page 70

• Manufacturer Part Number: DS3104GN
• Description: Timers & Support Products SDH-SONET-Synchronou s Ethernet Line Card
• Manufacturer: Maxim Integrated Products

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Note: These registers are identical in function. ICRx is the control register for input clock ICx.
Bit 7: DIVN Mode (DIVN). When DIVN is set to 1 and LOCK8K = 0, the input clock is divided down by a
programmable predivider. The resulting output clock is then passed to the DPLL. All input clocks for which DIVN =
1 are divided by the factor specified in
FREQ field of that register must be set to the input frequency divided by the divide factor. When DIVN = 1 and
LOCK8K = 1 in an
Sections
Bit 6: LOCK8K Mode (LOCK8K). When LOCK8K is set to 1 and DIVN = 0, the input clock is divided down by a
preset predivider. The resulting output clock, which is always 8kHz, is then passed to the DPLL. LOCK8K is
ignored when DIVN = 0 and FREQ[3:0] = 1001 (2kHz) or 1010 (4kHz). In addition, LOCK8K mode cannot be used
with 5MHz input clocks. When DIVN = 1 and LOCK8K = 1 in an
decoded as the alternate frequencies. See Sections
Bits 5 and 4: Leaky Bucket Configuration (BUCKET[1:0]). Each input clock has leaky bucket accumulator logic
in its activity monitor. The
Any of the four configurations can be specified for the input clock. See Section 7.5.2.
Bits 3 to 0: Input Clock Frequency (FREQ[3:0]). When DIVN = 0 and LOCK8K = 0 (standard direct-lock mode),
this field specifies the input clock’s nominal frequency for direct-lock operation. When DIVN = 0 and LOCK8K = 1
(LOCK8K mode) this field specifies the input clock’s nominal frequency for LOCK8K operation. When DIVN = 1 and
LOCK8K = 0 (DIVN mode), this field specifies the frequency after the DIVN divider (i.e., input frequency divided by
DIVN
nominal frequency for direct-lock operation.
DIVN = 0 or LOCK8K = 0: (Standard direct-lock mode, LOCK8K mode, or DIVN mode)
19-4627; Rev 7; 8/10
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0 = Disabled
1 = Enabled
0 = Disabled
1 = Enabled
00 = Leaky bucket configuration 0
01 = Leaky bucket configuration 1
10 = Leaky bucket configuration 2
11 = Leaky bucket configuration 3
0000 = 8kHz
0001 = 1544kHz or 2048kHz (as determined by SONSDH bit in the
0010 = 6.48MHz
0011 = 19.44MHz
0100 = 25.92MHz
0101 = 38.88MHz
0110 = 51.84MHz
0111 = 77.76MHz
1000 = 155.52MHz (only valid for LVDS inputs)
1001 = 2kHz
1010 = 4kHz
1011 = 6312kHz
1100 = 5MHz
1101 = 31.25 MHz (not a multiple of 8 kHz and therefore not valid for LOCK8K mode)
1110–1111 = undefined
+ 1). When DIVN = 1 and LOCK8K = 1 (alternate direct-lock frequencies), this field specifies the input clock’s
7.4.2.2
DIVN
and 7.4.2.4.
7
0
ICR
register, the FREQ field of that register is decoded as the alternate frequencies. See
LBxy
LOCK8K
6
0
ICR1, ICR2, ICR3, ICR4, ICR5, ICR6, ICR8, ICR9
Input Configuration Register 1, 2, 3, 4, 5, 6, 8, 9
20h, 21h, 22h, 23h, 24h, 25h, 27h, 28h
registers at addresses 50h to 5Fh specify four different leaky bucket configurations.
DIVN1
5
0
BUCKET[1:0]
and DIVN2. When DIVN = 1 and LOCK8K = 0 in an
7.4.2.2
4
0
and
7.4.2.3
ICR
3
register, the FREQ field of that register is
MCR3
register)
2
FREQ[3:0]
see below
1
ICR
70 of 136
register, the
0