Datasheet

Bus Operation
6-30 MCF5206e USER’S MANUAL MOTOROLA
the portion of the data bus used for the transfer, and the specific number of cycles needed
for each transfer.
Figure 6-16. Byte-, Word-, and Longword-Read Transfer with Asynchronous
Termination Flowchart (One Wait State)
NOTE
Zero-wait-state operation can be achieved with asynchronous
termination by asserting asynchronous termination
acknowledge (ATA) before the CLK cycle transfer start (TS)
is asserted. This may only be practical if ATA is tied to GND.
Refer to 3.5.12 Termination Tied to GND for more
information.
MCF5206e
SYSTEM
1. DRIVE ADDRESS ON A[27:0]
2. DRIVE R/W
TO READ (R/W = 1)
3. DRIVE SIZ[1:0] TO INDICATE BYTE, WORD OR LONGWORD
4. DRIVE TT[1:0] AND ATM TO INDICATE APPROPRIATE
ACCESS TYPE
5. ASSERT TS
FOR ONE CLK CYCLE
1. NEGATE TS
2. DRIVE ATM TO INDICATE APPROPRIATE ACCESS TYPE
*TO INSERT WAIT STATES, ATA IS DRIVEN NEGATED.
1. DECODE ADDRESS AND SELECT THE APPROPRIATE
SLAVE DEVICE.*
2. ASSERT ATA
3. DRIVE DATA ON APPROPRIATE BYTE LANES BASED ON
SIZ[1:0], A[1:0] AND PORT SIZE
1. REGISTER DATA
2. RECOGNIZE THE TRANSFER IS DONE
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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