Datasheet

Signal Description
MOTOROLA MCF5206e USER’S MANUAL 2-9
2.5.2 Size (SIZ[1:0])
These three-state bidirectional signals indicate the transfer data size for the bus cycle.
When an alternate bus master is controlling the bus, the MCF5206e monitors these
signals to determine the data size for asserting the appropriate memory control signals.
Table 2-7 shows the definitions of the SIZ[1:0] encoding.
2.5.3 Transfer Type (TT[1:0])
These three-state output signals indicate the type of access for the current bus cycle.
TT[1:0] are not sampled by the MCF5206e during alternate master transfers. Table 2-8
lists the definitions of the TT[1:0] encodings.
2.5.4 Access Type and Mode (ATM)
This three-state output signal provides supplemental information for each transfer cycle
type. ATM is not sampled by the MCF5206e during alternate master transfers. Table 2-9
lists the encoding for normal, debug and CPU space/interrupt-acknowledge transfer
types.
Table 2-7. Data Transfer Size Encoding
SIZ[1:0] DATA TRANSFER SIZE
00 Longword
01 Byte
10 Word
11 Line
Table 2-8. Bus Cycle Transfer Type Encoding
TT[1:0] TRANSFER TYPE
0 0 Normal Access
0 1 DMA Access
1 0 Emulator Access
1 1 CPU Space or Interrupt Acknowledge
Table 2-9. ATM Encoding
TRANSFER TYPE INTERNAL TRANSFER MODIFIER ATM (TS=0) ATM (TS=1)
00
(Normal Access)
Supervisor Code 1 1
Supervisor Data 0 1
User Code 1 0
User Data 0 0
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