MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 556
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MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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Chip Select Module
21.7 Functional Description
Advance Information
556
NOTE:
CSEN — Chip Select Enable Bit
Each chip select can provide a chip enable signal for an external device
and assert the internal bus cycle termination signal.
Setting the CSEN bit in CSCR enables the chip select to provide an
external chip enable signal.
Setting both the CSEN and TAEN bits in CSCR enables the chip select
to generate the internal bus cycle termination signal.
Both the chip select pin assertion and the bus cycle termination function
depend on an initial address/option match for activation. During the
matching process, the fixed base address of each chip select is
compared to the corresponding address for the bus cycle to determine
whether an address match has occurred. This match is further qualified
by comparing the internal read/write indication and access type with the
programmed values in CSCR of each chip select. When the address and
option information match the current cycle, the chip select is activated. If
no chip select matches the bus cycle information for the current access,
the chip select logic does not respond in any way.
Only one chip select can be active for a given bus cycle. The
configuration of the active chip select, determined by the wait state
(WS/WWS) field, the port size (PS) field, and the write enable (WE) field,
is used for the access.
WWS and WS are valid only if the TAEN bit is 1 for the active chip select.
logic can still terminate the access before the internal cycle
termination signal is asserted by asserting the external TA pin.
The CSEN bit enables the chip select logic. When the chip select
function is disabled, the CSx signal is negated high.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Internal cycle termination signal asserted by chip select logic
0 = Internal cycle termination signal asserted by external logic
1 = Chip select function enabled
0 = Chip select function disabled
Go to: www.freescale.com
Chip Select Module
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
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