MMC2107 - Freescale Semiconductor

External Bus Interface Module (EBI)
Freescale Semiconductor, Inc.
19.3.1 Data Bus (D[31:0])
The three-state bidirectional data bus (D[31:0]) signals are the
general-purpose data path between the microcontroller unit (MCU) and
all other devices.
19.3.2 Show Cycle Strobe (SHS)
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Freescale Semiconductor, I
19.3.3 Transfer Acknowledge (TA)
19.3.4 Transfer Error Acknowledge (TEA)
In emulation mode, show cycle strobe (SHS) is the strobe for capturing
address, controls, and data during show cycles.
The transfer acknowledge (TA) 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. TA is an input in master and emulation modes.
The transfer error acknowledge (TEA) indicates an error condition exists
for the bus transfer. The bus cycle is terminated and the CPU begins
execution of the access error exception. TEA is an input in master and
emulation modes.
19.3.5 Emulation Mode Chip Selects (CSE[1:0])
The emulation mode chip selects (CSE[1:0]) output signals provide
information for development support.
19.3.6 Transfer Code (TC[2:0])
The transfer code (TC[2:0]) output signals indicate the data transfer
code for the current bus cycle.
Technical Data MMC2107 – Rev. 2.0
506 External Bus Interface Module (EBI) MOTOROLA
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