Motorola MPC8260 User Manual

7-2

MOTOROLA

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Data transfer signalsÑThese signals, which consist of the data bus, data parity, and 
data parity error signals, transfer the data and ensure its integrity.

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Data transfer termination signalsÑData termination signals are required after each 
data beat in a data transfer. In a single-beat transaction, the data termination signals 
also indicate the end of the tenure. For burst accesses or extended port-size accesses, 
the data termination signals apply to individual beats and indicate the end of the 
tenure only after the Þnal data beat.

Figure  shows the grouping of the MPC8260Õs 60x bus signal conÞguration.

The MPC8260 hardware speciÞcations provides a pinout
showing pin numbers. These are shown in Figure 7-1.

Bus Request (BR)

Bus Grant (BG)

Address Bus Busy (ABB)

Transfer Start (TS)

Address Parity (AP[0Ð3])

Transfer Size (TSIZ[0Ð3])

Transfer Burst (TBST)

Cache Inhibit (CI)

Write-Through (WT)

Address Acknowledge (AACK)

Address Retry (ARTRY)

Data Bus Grant (DBG) 

Data Bus Busy (DBB)

Data (D[0Ð63])

Data Parity (DP[0Ð7])

Transfer Acknowledge (TA)

Transfer Error Acknowledge (TEA)

Reservation 

1

1

1

1

1

64

8

1

1

1

4

5

4

1

1

1

1

1

Data

Data

Data

Processor

Address

Address

Address

Transfer

Attributes

Address

ermination

1

Transfer Type (TT[0Ð4])

Global (GBL)

1

TLBI SYNC 

1

Partial Data Valid Indication (PSDVAL)

1

3

Transfer Code (TC[0Ð2])

Address (A[0Ð31])

32

Address Parity Enable

1

State

Termination

Transfer

Arbitration

Arbitration

Start

Bus