External Bus Interface
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
9-53
Figure 9-38. Peripheral Mode: External Master Writes to MPC561/MPC563 (Two Wait States)
9.5.13
Contention Resolution on External Bus
When the MPC561/MPC563 is in slave mode, external master access to the MPC561/MPC563 internal
bus can be terminated with relinquish and retry in order to allow a pending internal-to-external access to
be executed. The RETRY signal functions as an output that signals the external master to release the bus
ownership and retry the access after one clock.
describes the flow of an external master retried access.
shows the timing when an
external access is retried and a pending internal-to-external access follows.
CLKOUT
ADDR[8:31]
TS
(input)
BR
(input)
BG
BB
Data
TA
(output)
RD/
WR
Receive Bus Grant and Bus Busy Negated
Assert
BB
, Drive Address and Assert
TS
Data is sampled
BURST
TSIZ[0:1]
Minimum 2 Wait States
BDIP
Use the Internal Arbiter
O
O
O
O
O
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...