U-Bus to IMB3 Bus Interface (UIMB)
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
12-5
Note:
This diagram represents the ILBS behavior when IRQMUX[0:1] = 11
Figure 12-5. Time-Multiplexing Protocol for IRQ Signals
The IRQMUX bits determine how many levels of IMB3 interrupts are sampled. Refer to
.
12.4.4
Interrupt Synchronizer
The interrupt synchronizer latches the 32 levels of interrupts from the IMB3 bus into a register which can
be read by the CPU or other U-bus master. Since there are only eight lines for interrupts on the IMB3 and
32 levels of interrupts are possible, the 32 interrupt levels are multiplexed onto eight IMB3 interrupt lines.
Apart from latching these interrupts in the register (UIPEND), the interrupt synchronizer drives the
interrupts onto the U-bus, where they are latched by the interrupt controller in the USIU.
If IMB3 modules drive interrupts on any of the 24 levels (levels eight through 31), they will be latched in
UIPEND in the UIMB. If any of the register bits 7 to 31 are set, then bit 7 will be set as well.
Table 12-3. ILBS Signal Functionality
ILBS[0:1]
Description
00
IMB3 interrupt sources mapped onto 0:7 levels will
drive interrupts onto IMB3 LVL[0:7]
01
IMB3 interrupt sources mapped onto 8:15 levels will
drive interrupts onto IMB3 LVL[0:7]
10
IMB3 interrupt sources mapped onto 16:23 levels will
drive interrupts onto IMB3 LVL[0:7]
11
IMB3 interrupt sources mapped onto 24:31 levels will
drive interrupts onto IMB3 LVL[0:7]
Table 12-4. IRQMUX Functionality
IRQMUX[0:1]
ILBS sequence
Description
00
00, 00, 00.....
Latch 0:7 IMB3 interrupt levels
01
00, 01, 00, 01....
Latch 0:15 IMB3 interrupt levels
10
00, 01, 10, 00, 01, 10,.....
Latch 0:23 IMB3 interrupt levels
11
00, 01, 10, 11, 00, 01, 10, 11,....
Latch 0:31 IMB3 interrupt levels
IMB3 CLOCK
ILBS [0:1]
IMB3 LVL[0:7]
00
01
11
10
00
01
11
10
LVL
[0:7]
LVL
[8:15]
LVL
16:23
LVL
24:31
LVL
0:7
Summary of Contents for MPC561
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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...
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