
64
Agere Systems Inc.
Data Sheet
May 2001
and Packet Payload Engine
Ambassador T8110 PCI-Based H.100/H.110 Switch
7 Clock Architecture
(continued)
H-bus B-clocks
clock = CT_C8_B (8.192 MHz), frame = /CT_FRAME_B (8 kHz)
MC1 R-clocks
clock = inverted CT_C8_A (4.096 MHz), frame = /CT_FRAME_A (8 kHz)
MC1 L-clocks
clock = inverted CT_C8_B (4.096 MHz), frame = /CT_FRAME_B (8 kHz)
MVIP clocks
clock = /C4 (4.096 MHz), frame = /FR_COMP (8 kHz)
MVIP clocks*
clock = C2 (2.048 MHz), frame = /FR_COMP (8 kHz)
H-MVIP clocks
clock = /C16± (16.384 MHz), frame = /FR_COMP (8 kHz)
SC-BUS 2 MHz
clock = /SCLKx2, frame = /FR_COMP (8 kHz)
SC-BUS 4/8 MHz
clock = SCLK, frame = /FR_COMP (8 kHz)
* C2 is allowed as the bit clock input.
7.1.2 Main Divider Register
The main divider register contains [divider value – 1]. A value of 0x00 yields a divide-by-1 function.
A value of 0xFF yields a divide-by-256 function.
7.1.3 Analog PLL1 (APLL1) Input Selector Register
The APLL1 input selector register controls APLL1 reference input selection. The choices include the following:
n
APLL1 reference clock = oscillator/4 (4.096 MHz)
n
APLL1 reference clock = output of the main divider (4.096 MHz or 2.048 MHz)
n
APLL1 reference clock = output of the resource divider (4.096 MHz or 2.048 MHz)
n
APLL1 reference clock = output of DPLL1 (4.096 MHz or 2.048 MHz)
n
APLL1 reference clock = input from signal PRI_REF_IN (4.096 MHz or 2.048 MHz)
Table 45. Main Divider Register
Byte
Address
Name
Bit(s) Mnemonic
Value
Function
0x00201
Main Divider
7:0
CKMDR
LLLL LLLL
Divider value, {0x00 to 0xFF} = {div1 to div256},
respectively.
Table 46. APLL1 Input Selector Register
Byte
Address
Name
Bit(s) Mnemonic
Value
Function
0x00202
APLL1 Input Selector
7:0
P1ISR
0000 0000
0000 0001
0000 0010
0000 0100
0000 1000
Select oscillator/4 (default).
Select main divider output.
Select resource divider output.
Select DPLL1 output.
Select external input PRI_REF_IN.