mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 261
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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Each CSn can assert during specific CPU space accesses such as interrupt-acknowledge
cycles and each can be accessed by an external master. CS0 is a global chip select after reset
and provides relocatable boot ROM capability.
10.3.1 General Chip-Select Operation
When a bus cycle is initiated, the MCF5407 first compares its address with the base address
and mask configurations programmed for chip selects 0–7 (configured in CSCR0–CSCR7)
and DRAM block 0 and 1 address and control registers (configured in DACR0 and
DACR1). If the driven address matches a programmed chip select or DRAM block, the
appropriate chip select is asserted or the DRAM block is selected using the specifications
programmed in the respective configuration register. Otherwise, the following occurs:
Table 10-3 shows the type of access as a function of match in the CSCRs and DACRs.
• Chip-select mask registers (CSMRn) provide 16-bit address masking and access
• Chip-select control registers (CSCRn) provide port size and burst capability
• If the address and attributes do not match in CSCR or DACR, the MCF5407 runs an
• Should an address and attribute match in multiple CSCRs, the matching chip-select
• Should an address and attribute match both DACRs or a DACR and a CSCR, the
0
1
Multiple
0
1
Multiple
0
1
Multiple
control. See Section 10.4.1.2, “Chip-Select Mask Registers (CSMR0–CSMR7).”
indication, wait-state generation, and automatic acknowledge generation features.
See Section 10.4.1.3, “Chip-Select Control Registers (CSCR0–CSCR7).”
external burst-inhibited bus cycle with a default of external termination on a 32-bit
port.
signals are driven; however, the MCF5407 runs an external burst-inhibited bus cycle
with external termination on a 32-bit port.
operation is undefined.
Number of CSCR Matches
Table 10-3. Accesses by Matches in CSCRs and DACRs
Chapter 10. Chip-Select Module
0
0
0
1
1
1
Multiple
Multiple
Multiple
Number of DACR Matches
External
Defined by CSCR
External, burst-inhibited, 32-bit
Defined by DACRs
Undefined
Undefined
Undefined
Undefined
Undefined
Type of Access
Chip-Select Operation
10-3
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