MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 554
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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
Advance Information
554
NOTE:
PS — Port Size Bit
WWS — Write Wait State Bit
WE — Write Enable Bit
The WE bit has no effect on the EB[3:0] pin function if the chip select is
not active. If the chip select is not active, the EB[3:0] pin function is byte
enable by default.
read/write signal, which indicates whether the access is a read
(read/write = 1) or a write (read/write = 0). If the chip select logic
detects a violation (RO = 1 with read/write = 0), the access is ignored.
The PS bit defines the width of the external data port supported by the
chip select as either 16-bit or 32-bit. When a chip select is
programmed as a 16-bit port, the external device must be connected
to D[31:16]. For 32-bit accesses to 16-bit ports, the external memory
interface initiates two bus cycles and multiplexes data as needed to
complete the data transfer.
The WWS bit determines if an additional wait state is required for write
cycles. WWS does not affect read cycles.
The WE bit defines when the enable byte output pins (EB[3:0]) are
asserted. When WE is 0, EB[3:0] are configured as byte enables and
assert for both external read and external write accesses. When WE
is 1, EB[3:0] are configured as write enables and assert only for
external write accesses.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Only read accesses allowed; write accesses ignored by the
0 = Read and write accesses allowed
1 = 32 bit port
0 = 16 bit port
1 = One additional wait state added for write cycles
0 = No additional wait state added for write cycles
1 = EB[3:0] configured as write enables
0 = EB[3:0] configured as byte enables
chip select logic
Go to: www.freescale.com
Chip Select Module
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
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