MC68360EM25VL Freescale Semiconductor, MC68360EM25VL Datasheet - Page 382
MC68360EM25VL
Manufacturer Part Number
MC68360EM25VL
Description
IC MPU QUICC 25MHZ 240-FQFP
Manufacturer
Freescale Semiconductor
Datasheets
1.MC68EN360VR25L.pdf
(14 pages)
2.MC68EN360VR25L.pdf
(2 pages)
3.MC68360AI25L.pdf
(962 pages)
Specifications of MC68360EM25VL
Processor Type
M683xx 32-Bit
Speed
25MHz
Voltage
3.3V
Mounting Type
Surface Mount
Package / Case
240-FQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Features
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68360EM25VL
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
MC68360EM25VL
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
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SDMA Channels
The read or write operation may take multiple bus cycles if the memory provides less than
a 32-bit port size. For instance, a 32-bit long-word read from a 16-bit memory will take two
SDMA bus cycles. As long as a higher priority bus master does not require the bus during
an SDMA transfer, the entire operand (32 bits on reads and 8, 16, or 32 bits on writes) will
be transferred in back-to-back bus cycles before the SDMA relinquishes the bus. If a higher
priority bus master requests the bus during an operand transfer, it will be granted the bus at
the end of that SDMA bus cycle. Once the higher priority bus master relinquishes the bus,
the SDMA will reacquire the bus and continue any outstanding bus cycles.
The SDMA can steal cycles with no arbitration overhead when the QUICC is in master mode
(i.e., the CPU32+ is enabled) and the external bus is not currently being held by an external
master (see Figure 7-18). Note that in normal operation, the BR, BG, and BGACK signals
are not affected by the SDMA; however, an indication of the SDMA internal bus request can
be obtained from the BCLRO signal.
The SDMA will assert the BCLRO signal when it requests the bus if this capability is pro-
grammed in the SIM60 module configuration register and port E pin assignment register.
BCLRO can be used to clear an external bus master from the external bus, if desired. For
instance, BCLRO can be connected through logic to the external master’s HALT signal, and
then be negated externally when the external master’s AS signal is negated. BCLRO, as
seen from the QUICC, is negated by the SDMA during its access to memory.
7-58
CONTROLLER
RISC
4 SCCs
CPU32+
CORE
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 7-17. SDMA Data Paths
INTERNAL IMB
CHANNELS
14 SDMA
MC68360 USER’S MANUAL
2 SMCs
Go to: www.freescale.com
SERIAL CHANNEL DATA FLOW
2
DUAL-PORT
INTERNAL
1 SPI
RAM
SIM60
QUICC
1
EXTERNAL
RAM
EXTERNAL
ROM
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