MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Signal Description
Signal Descriptions
4.5.3.2 Show Cycle Strobe (SHS)
This output signal is used in emulation mode as a strobe for capturing
addresses, controls, and data during show cycles. This signal is also
used as RCON.
NOTE:
This input signal, used only during reset, indicates whether the states on
the external signals affect the chip configuration.
4.5.3.3 Transfer Acknowledge (TA)
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4.5.3.4 Transfer Error Acknowledge (TEA)
This signal indicates that the external data transfer is complete. During
a read cycle, when the processor recognizes TA, it latches the data and
then terminates the bus cycle. During a write cycle, when the processor
recognizes TA, the bus cycle is terminated. This signal is an input in
master and emulation modes.
This signal indicates an error condition exists for the bus transfer. The
bus cycle is terminated and the central processor unit (CPU) begins
execution of the access error exception. This signal is an input in master
and emulation modes.
4.5.3.5 Emulation Mode Chip Selects (CSE[1:0])
4.5.3.6 Transfer Code (TC[2:0])
These output signals provide information for development support.
These output signals indicate the data transfer code for the current bus
cycle.
4.5.3.7 Read/Write (R/W)
This output signal indicates the direction of the data transfer on the bus.
A logic 1 indicates a read from a slave device and a logic 0 indicates a
write to a slave device.
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA Signal Description 123
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