MPC8544VTALF Freescale Semiconductor, MPC8544VTALF Datasheet - Page 700

• Manufacturer Part Number: MPC8544VTALF
• Description: MPU POWERQUICC III 783-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MPC8544VTALF

• Processor Type: MPC85xx PowerQUICC III 32-Bit
• Speed: 667MHz
• Voltage: 1V
• Mounting Type: Surface Mount
• Package / Case: 783-FCPBGA
• Processor Series: MPC85xx
• Core: e500
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 667 MHz
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Data Ram Size: 32 KB
• I/o Voltage: 1.8 V, 3.3 V
• Interface Type: I2C, HSSI, DUART
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Local Bus Controller
14.5.1.2
To achieve high bus speed interfaces for synchronous SRAMs or SDRAMs, a hierarchy of the
memories/peripherals connected to the local bus is suggested, as shown in
The multiplexed address/data bus sees the capacitive loading of the data signals of the fast SDRAMs or
synchronous SRAMs plus one load for an address latch plus one load for a buffer to the slow memories.
The loadings of all other memories and peripherals are hidden behind the buffer and the latch. The system
designer needs to investigate the loading scenario and ensure that I/O timings can be met with the loading
determined by the connected components.
14.5.1.3
To achieve the highest possible bus speeds on the local bus, it is recommended to reduce the number of
devices connected directly to the local bus even further. For those cases probably only one bank of
synchronous SRAMs or SDRAMs should be used and instead of using a separate latch and a separate bus
transceiver, a bus demultiplexer combining those two functions into one device should be used.
14-80
Local Bus Interface
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Peripheral Hierarchy on the Local Bus
Peripheral Hierarchy on the Local Bus for Very High Bus Speeds
LAD[0:31]
LA[27:31]
LBCTL
LALE
Figure 14-69. Local Bus Peripheral Hierarchy
Muxed Address/Data
Non-Muxed Address
Buffered Data
DIR
A
D
LE
Latch
Buffer
Q
B
A
DQ
MA
Peripherals
Figure
Memories
Slower
and
14-69.
A
DQ
A
DQ
SDRAM
SSRAM
Freescale Semiconductor