MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 533

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
particular bits of the data bus. A 16-bit port is assigned to pins D[31:16]
and a 32-bit port is assigned to pins D[31:0].
Table 20-2
The data bytes shown in the table represent external data pins. This data
is multiplexed and driven to the external data bus as shown. The bytes
labeled with a dash are not required; the M•CORE will ignore them on
read transfers, and drive them with undefined data on write transfers.
In the case of a word (32-bit) access to a 16-bit port, the EBI runs two
external bus cycles to complete the transfer. During the first external bus
cycle, the A[1:0] pins are driven low, and the TSIZ[1:0] pins are driven to
indicate word size. During the second cycle, A1 is driven high to
Half-word
Transfer
1. The EBI runs two cycles for word accesses to 16-bit ports. The table shows the data place-
Word
Size
Byte
Freescale Semiconductor, Inc.
ment for both bus cycles.
For More Information On This Product,
External Bus Interface Module (EBI)
Width
16
Port
shows each possible transfer size, alignment, and port width.
16
32
16
32
16
32
16
32
16
32
16
32
32
Go to: www.freescale.com
(1)
TSIZ1 TSIZ0 A1 A0
Table 20-2. Data Transfer Cases
0
1
0
1
0
External Pins
1
0
0
0
0
1
1
0
1
0
1
0
0
1
0
1
0
0
0
0
0
D[31:24]
D[31:24]
D[31:24] D[23:16]
D[31:24] D[23:16]
D[31:24] D[23:16]
D[31:24] D[23:16]
—
—
—
—
—
—
—
—
—
External Bus Interface Module (EBI)
Data Bus Transfer
D[23:16]
D[23:16]
—
—
—
—
—
—
—
—
—
Advance Information
D[31:24]
D[31:24] D[23:16]
D[31:24] D[23:16]
D[15:8]
D[15:8]
D[15:8]
Operand Transfer
—
—
—
—
—
—
—
—
—
D[23:16]
D[7:0]
D[7:0]
D[7:0]
—
—
—
—
—
—
—
—
—
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