MPC8313ECZQADDC Freescale Semiconductor, MPC8313ECZQADDC Datasheet - Page 196
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MPC8313ECZQADDC
Manufacturer Part Number
MPC8313ECZQADDC
Description
Microprocessors - MPU 8313 REV2.2 PB ENC EXT
Manufacturer
Freescale Semiconductor
Datasheet
1.MPC8313CZQADDC.pdf
(1214 pages)
Specifications of MPC8313ECZQADDC
Processor Series
MPC8313E
Core
e300
Data Bus Width
16 bit
Maximum Clock Frequency
133 MHz
Program Memory Size
16 KB
Data Ram Size
16 KB
Interface Type
I2C
Mounting Style
SMD/SMT
Package / Case
PBGA
Number Of Programmable I/os
32
Number Of Timers
4
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Reset, Clocking, and Initialization
4.4.1
When the device is configured as a PCI host device (RCWH[PCIHOST] = 1), SYS_CLK_IN is the
primary input clock. SYS_CLK_IN feeds the PCI clock divider (÷2) and the PCI_SYNC_OUT and
PCI_CLK_OUT multiplexors. The CFG_CLKIN_DIV configuration input selects whether SYS_CLK_IN
or SYS_CLK_IN/2 is driven out on the PCI_SYNC_OUT and PCI_CLK_OUT signals.
PCI_SYNC_OUT is connected externally to PCI_SYNC_IN to allow the internal clock subsystem to
synchronize to the system PCI clocks. PCI_SYNC_OUT must be connected properly to PCI_SYNC_IN,
with equal delay to all PCI agent devices in the system.
4.4.1.1
When the device is configured as a PCI host, it provides three clock output signals, PCI_CLK_OUT[0:2],
for external PCI agents.
When the device comes out of reset, the PCI clock outputs are disabled and are actively driven to a steady
low state. Each of the individual clock outputs can be enabled (enable toggling of the clock) by setting its
corresponding OCCR[PCICOEn] bit. All output clocks are phase aligned to each other and to
PCI_SYNC_OUT.
4.4.2
When the device is configured as a PCI agent, PCI_CLK is the primary input clock. In agent mode, the
SYS_CLK_IN signal may not be used. If it is unused, SYS_CLK_IN should be tied to GND, and the clock
output signals, PCI_CLK_OUTn and PCI_SYNC_OUT, are not used.
In agent mode, the CFG_CLKIN_DIV configuration input can be used to double the internal clock
frequencies, if sampled as 0 during PORESET assertion. This feature is useful if a fixed internal frequency
is desired regardless of whether the PCI clock is running at 33 or 66 MHz. PCI specifications require that
the signal M66EN provides the PCI clock frequency information.
4.4.3
As shown in
by the system phase-locked loop (PLL) and the clock unit to create three major clock domains:
The csb_clk frequency is derived from a complex set of factors that can be simplified into the following
equation:
In PCI host mode, PCI_SYNC_IN × (1 + ~CFG_CLKIN_DIV) is the SYS_CLK_IN frequency.
The csb_clk serves as the clock input to the e300 core. A second PLL inside the core multiplies up the
csb_clk frequency to create the internal clock for the core (core_clk). The system and core PLL multipliers
4-30
•
•
•
The coherent system bus clock (csb_clk)
The internal clock for the DDR controller (ddr_clk)
The internal clock for the local bus interface unit (lbc_clk)
csb_clk = [PCI_SYNC_IN × (1 + ~CFG_CLKIN_DIV)] × SPMF
Clocking in PCI Host Mode
Clocking In PCI Agent Mode
System Clock Domains
Figure
PCI Clock Outputs (PCI_CLK_OUT[0:2])
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
4-7, the primary clock input (PCI_CLK/PCI_SYNC_IN) frequency is multiplied up
Freescale Semiconductor
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