Memory Access Timing
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
E-3
Note:
Shaded areas = address phase ; Non-shaded areas = data phase
Instruction Fetch->
cmf
2 consecutive
accesses and
External Bus-> cmf
C,U
2
U
C
—
3
—
—
—
—
—
—
—
U
11
U
E
Retr
y
E
4
U
8
U
E
1
N is the number of read cycle clocks from external address valid until external data valid. In the case of zero wait states,
N = 2.
2
Core instruction fetch data bus is usually the U-bus
3
8 clocks are dedicated for external accesses, and internal accesses are denied.
4
Assuming the external master immediately retries
Table E-2. Instruction Timing Examples for Different Buses (continued)
Note:
L = L-bus, U = U-bus, E = E-bus, C = CMF (Flash), IMB = intermodule bus, DC = DECRAM
Access
Number of Clocks
Total
1
2
3
4
5
6
7
8
9
10
11
12
13
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...