參數(shù)資料
型號(hào): MT92220
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 數(shù)字傳輸電路
英文描述: 1023 Channel Voice Over IP/AAL2 Processor
中文描述: ATM NETWORK INTERFACE, PBGA608
封裝: 31 X 31 MM, 2.50 MM HEIGHT, MS-034, EPBGA-608
文件頁(yè)數(shù): 158/210頁(yè)
文件大?。?/td> 1536K
代理商: MT92220
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Data Sheet
MT92220
158
Zarlink Semiconductor Inc.
13.0
The MT92220 has 2 main clock domains:
mem_clk_net
and
mem_clk_sar
. They are used for the Network
Interface and the SAR portion of the device accordingly. These clocks can be sourced externally or created
internally using PLLs.
Clocking
13.1
Programming the mem_clk_xxx PLL
The clock multiplication PLLs in the MT92220 are used to take a low frequency
upclk
, always provided on the
upclk
pin, and multiply it up to the
fast_clk
frequency. There, it is divided down to the
mem_clk_xxx
frequency.
The X, Y and Z divider can be programmed to any legal value through registers 164h or 166h (as defined in the
tables below).
upclk
can be fed into the device with a frequency ranging from 25 MHz to 66 MHz. Only frequencies
between
50 MHz and 53.3 MHz
are not supported by the PLL. The X and Y divisor tables indicate what values to
program in the X,Y and Z registers depending on the input value of
upclk
. The Z divisor table indicates the range of
mem_clk_xxx
that can be achieved with typical values of Z. Note that
mem_clk_xxx
cannot be programmed
above 100 MHz or below 40 MHz.
fast_clk
is used by the TDM interface and must operate between 160 MHz to
200 MHz.
The
mem_clk_xxx
PLL drives the output
mem_clk_xxx
pins. These pins provide both TTL and PECL interfaces
for
mem_clk_xxx
input and output. For both types, the output pins for
mem_clk_xxx
is always driven. However,
when the output pins are not being used, the register bits that control the toggling of these 2 pins should be
disabled to reduce power consumption.
The user must configure the MT92220 to select the desired
mem_clk_xxx
input type, either PECL or TTL.
mem_clk_xxx
serves as the main clock for the chip and therefore must be present for the MT92220 to function. It
is absolutely necessary for
mem_clk_xxx
to be present and one of the inputs to be selected. The
mem_clk_xxx
outputs however, are simply a convenience for the user and do not require to be connected. These outputs
eliminate the need for a second, high-speed oscillator. The user need only generate
upclk
.
The clock that is connected to the
mem_clk_xxx
inputs on the MT92220, whether it is TTL or PECL, must be in
phase with the clock connected to SSRAM used with the chip. The maximum skew allowed is ± 0.5 ns.
.
Div X
Div Y
upclk (MHz)
fast_clk (MHz)
-
-
0 to 30
-
1
6
30 to 33.33
160 to 200
1
5
33.33 to 40
166.66 to 200
2
8
40 to 50
160 to 200
-
-
50 to 53.33
-
2
6
53.33 to 66.66
160 to 200
Table 67 - Clock Divisor X and Y
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