MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
External Bus Interface Module (EBI)
Signal Descriptions
19.3.7 Read/Write (R/W)
The read/write (R/W) 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.
19.3.8 Address Bus (A[22:0])
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19.3.9 Enable Byte (EB[3:0])
19.3.10 Chip Selects (CS[3:0])
19.3.11 Output Enable (OE)
19.3.12 Transfer Size (TSIZ[1:0])
The address bus (A[22:0]) output signals provide the address for the
current bus transfer.
The enable byte (EB[3:0]) output signals indicate which byte of data is
valid during external cycles.
The chip selects (CS[3:0]) output signals select external devices for
external bus transactions.
The output enable (OE) signal indicates when an external device can
drive data during external read cycles.
TSIZ[1:0] provides an indication of the M•CORE transfer size.
19.3.13 Processor Status (PSTAT[3:0])
PSTAT[3:0] provides an indication of the M•CORE processor status.
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA External Bus Interface Module (EBI) 507
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