MOD5272-100IR NetBurner Inc, MOD5272-100IR Datasheet - Page 458
![PROCESSOR MODULE FLASH MOD5272](/photos/6/75/67555/mod5272-100ir_sml.jpg)
MOD5272-100IR
Manufacturer Part Number
MOD5272-100IR
Description
PROCESSOR MODULE FLASH MOD5272
Manufacturer
NetBurner Inc
Type
Controllers & Processorsr
Datasheets
1.MOD5272-100IR.pdf
(2 pages)
2.MOD5272-100IR.pdf
(3 pages)
3.MOD5272-100IR.pdf
(550 pages)
Specifications of MOD5272-100IR
Module/board Type
Processor Module
Ethernet Connection Type
10/100 Ethernet Port RJ-45
Operating Voltage
3.3 V
Product
Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
MOD5272
For Use With
528-1001 - KIT DEVELOP NETWORK FOR MOD5272
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
528-1008
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Bus Exception: Double Bus Fault
20.3 Bus Exception: Double Bus Fault
When a bus error or an address error occurs during the exception processing sequence for
a previous bus error, a previous address error, or a reset exception, the bus or address error
causes a double bus fault. If the MCF5272 experiences a double bus fault, it enters the
halted state. To exit the halt state, reset the MCF5272.
20.4 Bus Characteristics
The MCF5272 uses the address bus (A[22:0]) to specify the location for a data transfer and
the data bus (D[31:0] or D[31:16]) to transfer the data. Control signals indicate the direction
of the transfer. The selected device or the number of wait states programmed in the chip
select base registers (CSBRs), the chip select option registers (CSORs), the SDRAM
configuration and SDRAM timing registers (SDCR, SDTR) control the length of the cycle.
The MCF5272 clock is distributed internally to provide logic timing. All SRAM and ROM
mode bus signals should be considered as asynchronous with respect to CLKIN.
SDCR[INV] allows the SDRAM control signals to be asserted and negated synchronous
with the rising or falling edge of SDCLK. The SDRAM control signals are BS[3:0],
SDBA[1:0], RAS0, CAS0, SDWE, A10_PRECHG, SDCLKE, and CS7/SDCS.
The asynchronous INT[6:1] signals are internally synchronized to resolve the input to a
valid level before being used.
20.5 Data Transfer Mechanism
The MCF5272 supports byte, word, and longword operands and allows accesses to 8-, 16-,
and 32-bit data ports. The MCF5272 supports port sizes of the specific memory, enables
internal generation of transfer termination, and sets the number of wait states for the
external slave being accessed by programming the CSBRs, CSORs, SDCR, and SDTR. For
more information on programming these registers, refer to the SIM, chip select, and
SDRAM controller chapters.
20-4
Table 20-2. Chip Select Memory Address Decoding Priority
The MCF5272 compares the address for the current bus
transfer with the address and mask bits in the CSBRs and
CSORs looking for a match. The priority is listed in Table 20-2
(from highest priority to lowest priority):
Priority
Highest
MCF5272 User’s Manual
NOTE:
Chip Select 0
Chip Select 1
Chip Select 2
Chip Select
MOTOROLA
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